# Round Duct To Rectangular Duct Conversion Chart

Other radii and vaned elbows are available as needed. The above expression is obtained by equating the gas flow equations for a round and circular duct. , square versus 45 ° entry taps, conical versus straight taps, etc. Menyediakan jasa service AC, pemasangan AC, service Chiller, instalasi Chiller, baik dari perumahan, komersial sampai dengan pabrik atau industri. Provided here is the rectangular duct sizes chart for your personal reference and this chart / table shows the duct size (cfm) and their equivalent diameter in inches. We also carry a wide selection of Metal Flex Duct, Silver Flex Duct, Silentflex as well as many others. The formula for your particular case is FPM*π*r*r where π is a constant equal to 3,1416 and r is the radius of the duct. Hydraulic diameter: for a rectangular duct - diameter of a round duct whcih has the same pressure loss as the rectangual r duct at the same air flow rate and coefficient of friction. The following examples show how Revit calculates the equivalent round duct diameter for rectangular and oval duct. When calculating the diameter equivalent ($\text{de}$) of a round duct in a HVAC system, and we know the rectangular duct size, we can use the following formula: $$\text{de} = 1. 250] a = length of one side of rectangular duct (inch) b = length of adjacent side of rectangular duct (inch) De= circular equivalent of rectangular duct for equal friction and capacity (inch) Source: 2001 ASHRAE Fundamentals, p. Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. See SMACNA HVAC Duct Systems Design Manual Table 5-1 for longitudinal seam leakage rates. Use the friction chart at 1000 cfm in 9. Back of calculator has equivalent feet of straight duct for commonly used fittings, corrected pressure drop chart, and many HVAC formulas. ) Round Duct Rectangular Duct CFM Dia. Duct Size Calculator Cfm. The flexible type comes in rolls and is relatively easy to install on either round or rectangular ducts. mixing within a downstream distance of 3 diameters of an equivalent-area round. RECTANGULAR DUCT TO FIND EQUIVALENT ROUND DUCT Rectangular Duct Height (in) Enter Desired Height Enter Height 900 fpm 1,300 fpm 1,800 fpm 1,000 fpm 600 fpm 45º Bends (QTY) 90º Bends (QTY) APPROXIMATE DYNAMIC LOSS COEFFICIENTS SUPPLY VELOCITY MAXIMUM RECOMMENDED Temp, deg. etc) or use a ductulator to get the "FRICTION FACTOR" based on the required air velocity and duct size according to the area of. Example: The duct calculator indicates a 16 inch round duct. Round Duct Diameter. As the rectangular duct aspect ratio increases, the relative cost of rectangular over round also increases. Allows you to convert between Kair 150mm round and 220mm x 90mm rectangular ducting systems. Download spreadsheet xls for calculating and estimating duct cost. Geometric Shapes Chart. 09 mm 10 Deficient System Performance with System Effect Ignored 11 Establishment of Uniform Velocity Profile in Straight Fan Outlet Duct. Spiral round and oval duct is available in longer lengths than rectangular duct,. Today we move another step down the road of duct design. While a round duct acts as a natural conduit for this. Get connected… We supply our oval duct and fittings with a wide variety of connecting systems. APITU DPD JOGYAKARTA PT. Vent-A-Hood 18. 316 Ellingson Rd. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. Sheet Metal Connectors is not responsible for any results listed on these charts. Duct fittings allow different sized and shaped ducts to connect without constricting or causing turbulence within a duct system. The length of the rectangular duct size would range from 0. The total length of duct between fittings (A) and (B) is made up of ducts D1 and D2. Duct Calculator. How to calculate duct area in meters for bent,offset,round off square,reducer duct ? elbows equivalent to1. Formula d h = 2 × a × b/a + b. TDC (Transverse Duct Connector System) which is the ultimate & the most economical method of air tight duct connection in industry also makes sure to save time & material drastically with its well seal, strong and durable joint structure. Provides the following information with one setting:- Friction per 100 Feet of Duct- Velocity - FPM/Air Volume - CFM- Round Duct Size/Rectangular Equivalent Dimensions - Inches. Using warez version, crack, warez passwords, patches, serial numbers, registration codes, key generator, pirate key, keymaker or keygen for duct license key is illegal. rectangular duct and fittings are one part of our complete line of HVAC products. Unico provides plenum adapters for common round and square sizes. com : Catalog - Catalog,duct,ductwork,hvac duct supply,heating flex duct systems,a/c duct,ac ductwork,flex duct,duct end cap,jenn-air vent pipe,naca. Friction Loss Calculator for Sheet Metal Ducts. Duct areas in square feet can be calculated by using geometry rules for round areas. Select this Broan 411 duct accessory when attaching duct to the top (or vertical) discharge opening on the range hood. Used to terminate or block off a rectangular duct run in HVAC systems. Rectangular Ductwork Pipe (119) Round Ductwork Pipe (171) Spiral Ductwork Pipe (13) Duct Size. 625 / (a +b)0. X = not allowed. HVAC Mechanical Contractors can find all the forms needed here for Round, Rectangular and Oval Ductwork as well as credit application and Job Information Sheets. Oval Duct; Selection Chart; Oval Selection Chart. It help you draw HVAC Ducting (2D & 3D): Rectangular, round and flat oval ducting with auto-BOM, auto-labeling, flat sheet development. Duct Velocity. Shop for Duct Square-To-Round at Ferguson. Gases being vented through the duct typically move in a circular motion as they pass to the outside. Duct Size Calculator Cfm. Size both round and rectangular ductwork with the ease of a traditional Ductulator. RECTANGULAR DUCT DATA Table A3. DOUBLE WALL ROUND AND OVAL DUCTWORK. Duct Calculator. Meanwhile, the downloads below will give you the. 926 V V Figure 2: Location of measuring points for traversing a rectangular duct using log-Tchebycheff. Additionally, US Duct offers the fitting in gauges from 10 - 22 gauge, and in galvanized and SS 304 and SS 316. When calculating the diameter equivalent (\text{de}) of a round duct in a HVAC system, and we know the rectangular duct size, we can use the following formula:$$\text{de} = 1. Units) (Diameter of the round duct which will have the capacity and friction equivalent to the actual duct size. Flex Duct Cfm Chart Unique Bathroom Vent Duct Size Wildheart T Com. carrying capacity of a predetermined round duct. Nominal Size (mm) Base Tube Dia. will have to be cut to fit, using the tin snips, in order to ø 4 s x 10 s rectangular or 6 s diameter round duct should. A gauge chart to determine sheet metal thickness. One way to use the charts is to enter base scale at value corresponding to the width of duct, say 14 inches (follow broken lines in either chart). Cutting Into Existing Duct Work Question. Flat Oval to Round Calculator Rectangular to FO & Round Instructions A CFM d DD Dh e f L P Pi Re V f friction factor (dimensionless) L V d e DD diameter of duct, in P A Re reynolds number, dimensionless Pi CFM cubic feet per minute Base Design ∆pf friction loss per L feet of duct in terms of total pressure, iwg Dh density, lbm/ft3 D Number of. The velocity of an air stream in a duct is not uniform over the cross section of the duct. This is simply because when supply duct airflow is actually and accurately measured in the field, we've found that 0. Ductwork chart main duct flow rates. TO CONVERT TO METRIC VALUES:. How to Convert a Round Duct to Rectangular | Hunker In your home heating/air conditioning system, you have ductwork to push air through your home. This chart should not be used if you are designing a full duct system. Air Volume Equivalent Round Air Volume CFM 4" 6" 8" 10" 12" Duct (inches) CFM 50 6 x 4 550 75 6 x 4 675 100 8 x 4 6 x. Pleaseclick here for more information on our Oval Capabilities. a standard 3X" x 10" rectangular duct, If a round duct is required, a rectangular-to-round transition adaptor must be used, Do not use less than a 6" diameter duct. Stack Boot - Provides a straight-line transition from specially-sized round pipe or insulated flexible duct to a rectangular stack duct. 6 (24#) and with the price from the manufacturer it calculates sub total form to obtain. An equivalent diameter is the diameter of round duct that will handle the same amount of air (cfm) at the same friction loss as a given size of rectangular duct. Enter Round Duct Diameter. Duct Calculator. Go to the friction loss chart in any HVAC standard (CARRIER,. Weight UPC Item Code (050206) TTO6 6" 10 11. EZWeb-Tools is a Free SEO Friendly Directory, and comprehensive directory of websites. 1 inches of water. in a project. D - Diameter (Round Duct) 4 - Transition type. And, just to make things interesting, each of those terms has a different definition. Flat oval 3. Our family of pre-insulated products are designed to increase the efficiency of the application with higher R-values and lower air leakage, while at the same time increase installation efficiency with lightweight duct systems that require no additional insulation or wrapping. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. ) (4MG71)? Grainger's got your back. This chart should not be used if you are designing a full duct system. Top, centre or. Rectangular Sheet Metal Duct =. Figure 16 f. DUCT DESIGN, LEVEL 1: FUNDAMENTALS Distribution Systems 2 Space Availability The sizing criteria will often be defined by the space available to run the ductwork (Figure 1). 36 with the flow direction along the x axis. The ratio of longer side of rectangular duct to the diameter of circular duct is 2. Duct type: Metal Ductboard Flex Size by: Friction rate Velocity Friction Rate: per 100 ft. Flexible duct work must be stretched tightly for maximum air flow. 625/(a + b)0. To minimize field-assembly costs, rectangular duct is supplied in lengths up to 5 feet. ” Multiply the duct dimension (24”) by the numbers in the table to arrive at the various insertion depths for that side of the duct. MANUAL D: DUCT DESIGN CALCULATION SERVICE. For you to know that something is actually happening the bottom line always displays the "Exact" dimensions and solutions regardless of the. Design best practices for metal systems upstream of textile diffusers should be applied. 316 Ellingson Rd. Round duct, therefore, requires less metal than rectangular equivalents. w/ or w/o insulation. Equivalent Duct Calculator (Round vs Rectangular). WordDomination. Thermaduct provides high quality insulated ductwork systems to both interior and exterior installations. In "Duct Size by Dimension" mode, users can enter either a round duct diameter or rectangular duct height and width. There are many online calculators where you input the feet per minute (FPM) and they calculate the cubic feet per minute (CFM) for both rectangular and circular ductwork. , square versus 45 ° entry taps, conical versus straight taps, etc. 10 inches per 100 feet of lineal duct. table 6 - circular equivalent diameter,* equivalent area and duct class of rectangular ducts for equal friction. Front of calculator includes scales for friction, velocity, round duct size, weight per linear foot of round duct, surface area in square feet per lineal foot of round duct, rectangular equivalents of round duct sizes, weight per linear foot of rectangular duct and surface area in square feet per linear foot of Rectangular duct. 1) Size: For a given pressure loss, the surface area of rectangular duct can be double the comparable round duct surface area. ASHRAE has assigned the square to round fitting the number SD 4-2. Round spiral duct is the best choice for duct construction, but if you don't have the room, flat oval is still a better choice than rectangular duct. 25 Where • Deq = equivalent diameter. 7741 fx: 253. While a round duct acts as a natural conduit for this. 7 in-wc/psi) = 0. will have to be cut to fit, using the tin snips, in order to ø 4 s x 10 s rectangular or 6 s diameter round duct should. The following is a typical HVAC Rectangular to Round Duct Flow Equivalents Chart. 2 into square inches by multiplying by 144. This table assumes that elbows are not used. As the rectangular duct aspect ratio increases, the relative cost of rectangular over round also increases. Once you get past the initial shock of the size of these products, you will be eager to do it right the first and every time. 25" Material: Heavyweight coated calculator board. 810 Cold air boot, collar, duct 45- 65' EL AIR FLOW DYNAMICS & DUCT SIZING REFERENCE GUIDE SUPPLY OR RETURN DUCT SIZE/CAPACITY (. Most of the duct friction charts that are out there are based on round ducts. Units) (Diameter of the round duct which will have the capacity and friction equivalent to the actual duct size. 9781622709830. Mixing characteristics of directly opposed rows of jets injected normal to a crossflow in a rectangular duct. #10 Tek Screw Screws by Others Space 6” O. Maximum duct length: For satisfactory air movement, the total duct length of 31ø 4s x 10s rectangular or 6s diameter round duct should not exceed 140 equivalent feet. 4 psi or less, often much less. The hvac man wants to distort the 6 inch duct into the 4. A big part of any HVAC project is calculating duct flows, pressure losses, converting duct flow volumes etc. This will require a Transition, see page 18. Duct Size Cfm Rectangular Duct Rectangular Duct Formula Rectangular. A rectangular to round transition adapter must be used. ‎The Duct Calculator App for iPhone/iPad is a modern take on a the classic duct sizing wheel, allowing HVAC engineers, designers and contractors quickly and accurately size a new duct or calculate the performance of an existing duct on your iOS devices. There are three duct classifications. 7741 fx: 253. Multiply the numbers in the table times the duct dimension to get insertion depth for the probe. The types of fittings to be used based on the designer's calculations of fitting losses (i. The main focus of the paper is on numerical computations to simulate MHD flows in the first experiments on PbLi flows in a stainless steel rectangular duct with a foam-based silicon carbide (SiC) FCI. Stack Boot - Provides a straight-line transition from specially-sized round pipe or insulated flexible duct to a rectangular stack duct. a is the rectangular duct width (mm or in). Hitung Duct dengan Mudah Unit System. The chart is based on round duct, which is where the example uses the Huebscher correlation to find the equivalent round duct. 9936 e-mail: [email protected] tdc duct constructed per smacna standards-first edition 1995 2. Rectangular & Circular Waveguide: Equations, Fields, & f co Calculator: The following equations and images describe electromagnetic waves inside both rectangular waveguide and circular (round) waveguides. HVAC - Tech Charts. 13171, Started by devitg on 02/07/04 round to rectangular duct conversion to get the round equivalent of a rectangular duct, the following equation is used. rectangular duct and fittings are one part of our complete line of HVAC products. TDC/TDF Duct & Fittings Using the latest available technology in rectangular duct manufacturing i. Fully compatible with AutoCAD, AutoCAD LT, Bricscad, ZWCAD and IntelliCAD. Round to Rectangular Adaptor 200 Ø Rectangular Duct Support Clip. Example: The duct calculator indicates a 16 inch round duct. 926 V V Figure 2: Location of measuring points for traversing a rectangular duct using log-Tchebycheff. East Michigan 37050 Plymouth Rd Livonia MI 48150 T 734. The Conversion branch below Duct. o box 1665 irmo, sc. Enter an internal duct diameter in inches (this can be any number, it doesn't need to be standard duct size) To get an idea of the equivalent rectangular duct size, adjust the aspect ratio. A rectangular to round transition adapter must be used. Find the resistance per elbow on back of duct calculator or on the charts below ( one 8-in. Highlights:- Duct sizing for Rectangular, Round or Oval shape with 3+1 common sizing methods (i. Manufacturer of lock-seam, high pressure spiral pipe and fittings. ) table 6 - circular equivalent diameter,* equivalent area and duct class of rectangular ducts for equal friction. This duct calculator is the technicians favorite. theductshop. The Eastern Sheet Metal Rectangle to Round Duct Calculator App is used by sheet metal. To find the circular equivalent of a specific rectangular duct, use the chart at left to obtain equal pressure loss with equal velocity; the chart on right to obtain pressure loss with equal capacity. • A = cross-section of duct in sq-ft For rectangular ducts • a = Width of duct side (inches) • b = Height of other duct side (inches) Equivalent Round Duct Size for a Rectangular Duct Equivalent round duct size for a rectangular duct can be expressed as Deq = 1. Round or rectangular supply ducts extend as branches from the plenum extension to the warm- air supply outlets. Equivalent Round Duct Diameter: Enter the Length of the Rectangular Duct. We offer a complete line of rectangular to round transitions for spiral pipe. rectangular duct and fittings are one part of our complete line of HVAC products. Shop for Duct Square-To-Round at Ferguson. All silencer components that make up a nested elbow bank are constructed identically. Back to top. pdf version of the duct size chart. Rectangular to Round Conversion De = 1. If we enter Chart 5 (Masterclass Part 29) at the air quantity and rise vertically until the line intersects with equivalent duct diameter 609 mm we establish the fraction loss is 0. Each portion of a factory-made air duct sys-tem shall bear a listing and label indicating compliance with. The Lift Downdraft is everything you want in a luxury ventilation system — power, performance, and good looks. Changing the shape of a duct from rectangular or square to round. Sheet Metal Duct Friction Loss Calculator. Duct conversion round to oval. 9 Friction Chart for Round Duct (r =1. Size both round and rectangular ductwork with…. Double wall duct and fittings are available with 1", 2", 3" or 4" thick insulation. The table is based on the ducts friction loss formula. To convert to feet, divide by 144 (144 is the number of square inches in a square foot) 254. Click here to download the. pdf version of the duct size chart. Mechanics. ) Rectangular and Circular HVAC Ducts - Equivalent Diameter. East Michigan 37050 Plymouth Rd Livonia MI 48150 T 734. Rectangular Duct and Round Duct: The duct sizes listed in the chart provided are based on a fraction drop of. Fiberglass Duct Liner. round vertical duct opening. This is the same technique is used to made round corners of rectangular expansion joints. Straight Duct with Lateral Tap 15 46 44 42 9 23 2" & 3" Micro-Adjustable EZ Damper 25 6" - 14" AMCA Industrial Isolation Damper 29 Custom Fitting 22 Concentric Round to Rectangular Transition 21 6" - 14" Industrial Isolation Damper 32 36 T W DUCT DIA "D" H 2" & 3" EZ Blastgate 41 4" - 14" Industrial Balancing Damper 26 4" Industrial Isolation. Duct Sizing & Calculator portion includes calculating: - Equivalent duct sizes * Rectangular to Round and Equivalent Rectangular Sizes. A llows connections from rectangular grilles to round ducting. Other Hart & Cooley Mobile Tools. Enter Duct Airflow (CFM), Duct Velocity (FPM), Duct Length and the number of bends. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. expansion joint, limiting the axial travel and supporting the weight of adjacent ducting. Also included in Table 2 are heat transfer data which will be discussed later. Heating, Air Conditioning, Ventilation and Air Distribution Products Web Line Direct Help Line 1. 09 mm 10 Deficient System Performance with System Effect Ignored 11 Establishment of Uniform Velocity Profile in Straight Fan Outlet Duct. Their measurements showed that those two sizes of oval duct are equivalent to round duct at 5. MAS Duct Flow Calculators. If the duct is circular, choose "Circumference," "Diameter" or "Radius" from the measurement drop-down box. duct should be in a straight section of duct with 10 straight equivalent duct diameters upstream, and 3 straight equivalent duct diameters downstream of the traverse plane, although a minimum of 5 duct equivalent diameters upstream and 1 duct equiva-lent diameter downstream may give adequate results. The table below can be used to compare equivalent diameters for rectangular and round circular ducts , ductwork sizing , friction loss, sheet metal gauges, etc. Duct Sizing With Cfm And Friction Loss Table 2017. Let's say you completed a low pressure galvanized takeoff and you want to convert it to round or spiral to compare labor and material pricing. Unsealed rectangular metal duct may follow Leakage Class 48. It provides the duct, the insulation and cladding all in one high performance product. will have to be cut to fit, using the tin snips, in order to ø 4 s x 10 s rectangular or 6 s diameter round duct should. Duct Size Calculator Cfm. 3 (Duct Friction Chart), is obtained the friction loss as 0. This table also lists the ASTM and UL. If an equal friction design has a mixture of short & long runs of duct, the shortest duct will need a considerable amount of damping. This is especially true with flex duct, which actually has its own special version of a duct slide rule. Go to the friction loss chart in any HVAC standard (CARRIER,. Duct Calculator. Rectangular to Round Conversion De = 1. Multiply this number by 3. Table 1 - Single-wall, Flat Oval Duct Available Range of Spiral Duct Basic Round Diameter Used to Fabricate Spiral Flat Oval Duct by Thickness1 Gauge refer to McGill AirFlow's brochure Installation of Single-wall Duct and Fittings. For con-version of round equivalents to rect-angular sizes, use Table 2 “Equivalent Rectangular Duct Dimensions” from the same reference. Shop Broan Transition in the Duct Reducers department at Lowe's. round to rectangular duct conversion to get the round equivalent of a rectangular duct , the following equation is used. A full range of matching fittings are available for all sizes of Flat Oval ductwork. 9936 e-mail: [email protected] Available in an assortment of configurations. Duct conversion round to oval. ” We all know flex has more. Purchase ducting supplies including flexible, ventilation and air duct in white, in a variety of sizes and purposes. When rounding odd or even there are many solutions and numbers will not always change. Duct Calculator. Brand Resources. Formula: d h = 2 × a × b/a + b. SL) Rectangular (TD) 50 5" 8 x 6 75 5" 8 x 6 100 6" 8 x 6 3½ x 10 (110) 125 6" 8 x 6 3½ x 12 (140) 150 7" 8 x 6 3½ x 14 (160) 175 7" 8 x 6 200. Offers galvanized steel construction. This is simply because when supply duct airflow is actually and accurately measured in the field, we've found that 0. The total length of duct between fittings (A) and (B) is made up of ducts D1 and D2. What size round duct is best for a 2. 5 is the area of the circle in inches. Gustafson G-0 single wall round Rectangular to Round Conversion De = 1. Size for *400 cfm per nominal ton, convert round sizes to their rectangular equivalent as needed. Best Master Flow 16 in. Duct Traversing for Average Air Velocity and Air Volume The velocity of an air stream in a duct is not uniform over the cross section of the duct. Equivalent Rectangular Duct Size. Single Wall Round Air Distribution Corporation CONNECTORS Slip Fit Connection Accuflange® Connection SIDE VIEW PIPE 1-3/8" 3/8" 2" Spiral Pipe - Customer specified duct length shall be flange face to flange face dimension. Attenuating noise carried through ductwork is a vital function of a duct liner insulation material to help create productive living, work and learning environments. rectangular duct and fittings are one part of our complete line of HVAC products. diameter elbow is equivalent to 15 ft. org spiral duct manufacturers association p. Friction Loss. 0 when installed with two 0. A quick and easy to use calculator that helps you work out the equivalent size of duct work. Duct Fitting Equivalent Length Calculator Duct Fitting Equivalent Length Calculator Equivalent Length of Pipe Calculator. Online Ductulator Free Duct Size Calculator. The Eastern Sheet Metal Rectangle to Round Duct Calculator App is used by sheet metal. To use this chart, convert a rectangular duct with sides of 17 inches by 16 inches, respectively. The maximum duct velocity is found from Table 4. #8 Tek Screw or larger Space 10” O. 75” air gaps between the duct and two layers of the insulation. Enter an internal duct diameter in inches (this can be any number, it doesn't need to be standard duct size) To get an idea of the equivalent rectangular duct size, adjust the aspect ratio. Offers galvanized steel construction. The Eastern Sheet Metal Rectangle to Round Duct Calculator App is used by sheet metal. It provides the duct, the insulation and cladding all in one high performance product. was giving me problems, and the other duct transition pieces I found were. Hi all, I think this is the correct forum for these questions - if not, let me know and I'll lift and shift. The Engineering Tutorial 1,665 views. TDC (Transverse Duct Connector System) which is the ultimate & the most economical method of air tight duct connection in industry also makes sure to save time & material drastically with its well seal, strong and durable joint structure. inside the duct (see figure 1). For you to convert a rectangular duct to a round duct, you will first have to calculate the equivalent diameter of the round duct. Better acoustic perf. Save time and money on your next commercial or industrial duct system, by choosing our spiral round and flat-oval duct systems. Enter Round Duct Diameter. The equivalent diameter is the diameter of a circular duct or pipe that for equal flow gives the same pressure loss or resistance as an equivalent rectangular duct or pipe. This "Equal-Friction" method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. tdc duct constructed per smacna standards-first edition 1995 2. This can be found by multiplying the two adjacent sides of the rectangular duct. 05 for returns. More Call us! 888-444-3828. Round to Rectangular Adaptor 200 Ø Rectangular Duct Support Clip. You will get the advantages of automation and mass production without the expense of investing in the required equipment. ): Round Duct Equivalent Diameter (in. Duct Calculator. Addition Chart. Spiral round and oval duct is available in longer lengths than rectangular duct,. 5 cm (10 inch by 5 inch) rectangular duct because they have the same cross-sectional area. For an equivalent circular duct having equal VELOCITY and PRESSURE DROP, calculate the hydraulic mean diameter dh thus: dh = 4 * (cross sectional area / wetted perimeter) If, on the other hand, you want to find an equivalent circular duct having equal FLOW RATE and PRESSURE DROP, the formula is a little more complicated but it will be something. 37 west sunbury, ohio 43074 phone: 740. This "Equal-Friction" method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. 3 * (a *b) ^ 0. customary system. 07" on most metal duct calculators Duct Size Duct Height - Net inside dimension in inches ROUND DUCT SIZE ESTIMATE RECTANGULAR DUCT SIZE ESTIMATE 14" 5" 6" 7" 8" 16" 18" 20" Design Airflow 50 75 110 9" 10" 12" 1300 1700 160 225 300 480 700 1000 Duct Size 5" 6" 7" 8" 18" 20" 9" 10" 12" Flexible Duct Round Metal Pipe 750 1200 14" 16". rev:01/08/10. Description: The Eastern Sheet Metal Equivalent Round Duct Calculator app allows sheet metal contractors, installers, HVAC engineers, and contractors to quickly convert rectangular and flat oval duct dimensions to round. MAS Duct Flow Calculators. The design of a duct system utilising flat-oval duct follows the same procedures used with rectangular duct. 5/16” thick by 3/4” wide closed. 20 kg/m3 and e = 0. , equal friction, velocity, by duct dimensions or find Airflow). HelpWire is the ultimate one-stop shop for people of all expertise levels looking for help on all kind of topics -- tech, shopping and more. This is a duct design application that helps you optimize your designs while maintaining a minimum pressure system. V-31 Rectangular. You will get the advantages of automation and mass production without the expense of investing in the required equipment. Duct Traversing for Average Air Velocity and Air Volume The velocity of an air stream in a duct is not uniform over the cross section of the duct. Elbows 14” through 30” shall be. The equivalent (or hydraulic) diameter is a bit different. To then convert that to volume, you multiply the resulting area by the length. Duct Calculator. To supply 1200 CFM and sticking to your 8-inch duct size, if your duct is RECTANGULAR then according to our duct chart you'd need an 8" duct that's 26" x 8". Himmelstein | May 04, 2017 Sheet metal contractors, HVAC engineers, and others who need to quickly convert rectangular and flat oval duct dimensions to round, or rectangular to flat oval may want to take advantage of the Eastern Sheet Metal Rectangle to Round Duct Calculator App. How to Calculate squarefoot of a round duct The Practical Study How to calculate the area of duct rectangular circular reducer 2:46. Elbows 14” through 30” shall be. Ask Question Asked 4 years, 10 months ago. in/wg Duct TEL : ft. round to rectangular. ESTIMATION QUOTES. TO FIND EQUIVALENT ROUND DUCT Rectangular Duct Height (in) Enter Desired Height Enter Height STATIC PRESSURE CALCULATOR 1300. * Indicates Required Field Rectangular Width *. How to Size Ducting | eHow. [4], and Marco and Han [70]. Table 3-5 Round Duct Gage Unreinforced Positive Pressure To 10 in. Single Wall Round Submittal Precision Duct Systems 4570 Commerce Cir SW • Atlanta, GA 30336 Phone (404) 505-2542 Connection Types All fittings are made standard as male size (1/8” smaller) for slip fit into standard spiral ducts except for female coupling, which is made female size equivalent to standard spiral ducts. Round to Rectangular Adaptor 200 Ø Rectangular Duct Support Clip. Flex Duct Cfm Chart Unique Bathroom Vent Duct Size Wildheart T Com. Highlights:- Duct sizing for Rectangular, Round or Oval shape with 3+1 common sizing methods (i. Duct wrap can take the form of rigid or flexible insulation materials, and the selection process should be based on a variety of conditions: round, oval, or rectangular ducts; indoor or outdoor installation; insulation R-value only or breakout noise control only, or both; and type of facility (e. 10 inches per 100 feet of lineal duct. We offer a wide variety of Ductwork and Fittings including Ceiling Boxes, 45 and 90 degree Elbows, Floor Boxes, KD Pipe, Pant Wyes, Tee Wyes, Square to Round Transitions and much more. Look into the ACCA Manuals (J and D). Online Ductulator. Mechanics. To find the circular equivalent of a specific rectangular duct, use the chart at left to obtain equal pressure loss with equal velocity; the chart on right to obtain pressure loss with equal capacity. pdf from AA 1Duct Design Friction Chart for Round Duct (ρ = 0. rectangular duct and fittings are one part of our complete line of HVAC products. To establish the equivalent length of dryer exhaust duct for the 4 inch smooth 90° elbow with a 10 inch radius, you cancel out the equivalent factors and are left with the following. Front of calculator includes scales for friction, velocity, round duct size, weight per linear foot of round duct, surface area in square feet per lineal foot of round duct, rectangular equivalents of round duct sizes, weight per linear foot of rectangular duct and surface area in square feet per linear foot of Rectangular duct. This is a duct design application that helps you optimize your designs while maintaining a minimum pressure system. The Conversion branch below Duct. P (800) 433-6341 F (800) 223-8461 Map. SPACESAVER LOW PROFILE DUCTING. Calculation Method [Friction or Velocity] Round Duct Air Velocity [fpm] Rectangular Duct. For making the conversion, it is necessary to utilize a chart that gives the rectangular. HVAC - Tech Charts. It will also convert rectangular to flat oval. A rectangular to round transition adapter must be used. Frequently it is not convenient or desirable to use round ducts. The coefficient for a three section elbow in SMACNA Duct Design Handbook is 0. 3 is interesting for its caution: “Use friction loss data characteristic of flexible duct. Sheet Metal Connectors is not responsible for any results listed on these charts. Wall Thickness. Houston, Texas 77029 Phone: (713)678-8471 Fax: (713)672-0509 Toll-Free (877)774-DUCT (3828). Enter Round Duct Diameter. Duct Size Calculator Cfm. 250] a = length of one side of rectangular duct (inch) b = length of adjacent side of rectangular duct (inch) De= circular equivalent of rectangular duct for equal friction and capacity (inch) Source: 2001 ASHRAE Fundamentals, p. 1 Size round ducts installed in place of rectangular ducts indicated from ASHRAE table of equivalent rectangular and round ducts. Math Chart Generator. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. Rectangular Sheet Metal Duct =. Size both round and rectangular ductwork with…. Static pressure of worst branch and main duct can be calculated by using the following Chart 2. This module also includes the powerful Straight/Bend duct utility with the versatile - Duct on the Run function (2-D only). duct with insulation is only 14 in. COPYRIGHT, NEBB 2005 National Environmental Balancing Bureau Page _____ of _____ PROJECT__Henry A Guerra Library_____ SYSTEM DESIGNATION___AHU-3_____ LOCATION __Main. Rectangular sheet metal. Each portion of a factory-made air duct sys-tem shall bear a listing and label indicating compliance with. The Cutter II is a state of the art Computer Numerically Controlled (CNC) Cutting System designed to use a plasma-cutting torch to cut out geometrical shapes and parametrically programmed HVAC (Duct Work) fittings. Let's say you completed a low pressure galvanized takeoff and you want to convert it to round or spiral to compare labor and material pricing. It can be mended to any near diameters by using right forming die. of straight duct) 3 elbows at 15 equivalent feet each=45 equivalent feet 5. allowable equivalent length, the diameter of a round duct must be increased by 10% for each additional 20 feet (6. Solution: 1) Main Duct cfm = 1400 + 600 + 1000 = 3000. Calculation Method [Friction or Velocity] Round Duct Air Velocity [fpm] Rectangular Duct. Round Duct Diameter. According to CIBSE Guide B – HVAC / 2005, clause 3. In the extended plenum system (see Figure 7-3), a large rectangular duct extends straight out from the furnace plenum (hence the term extended plenum) and generally in a straight line down the center of the basement, attic, or ceiling. It can be mended to any near diameters by using right forming die. I am having HVAC duct work done. Round spiral duct is the best choice for duct construction, but if you don't have the room, flat oval is still a better choice than rectangular duct. Thermaduct provides high quality insulated ductwork systems to both interior and exterior installations. ectangular duct width or height of 2450mm and larger requires uangyih-tech engineering review. Flex duct =. Hvac Duct Equivalent Hvac Duct Size Cfm. The AFG Flow Grid is available in two tube diameters and lengths (See Table 1). Fabric Duct Sizing Calculator. 5 kPa and velocities less than 10 m/s. Ferguson is the #1 US plumbing supply company and a top distributor of HVAC parts, waterworks supplies, and MRO products. Rectangular, Round & Flat Oval Duct. For an equivalent circular duct having equal VELOCITY and PRESSURE DROP, calculate the hydraulic mean diameter dh thus: dh = 4 * (cross sectional area / wetted perimeter) If, on the other hand, you want to find an equivalent circular duct having equal FLOW RATE and PRESSURE DROP, the formula is a little more complicated but it will be something. Looking for BROAN Transition Duct, 3 1/4 x 10 to 7" Round Duct Size (In. 10 pressure drop per 100’ EL) CFM Round (No. Table 2, taken from their work, lists the friction factor Reynolds number product for isosceles triangular ducts as a function of the duct apex angle, 2α. Do not use data for round sheet metal duct. Using our hydraulic diameter page: If you have a non-circular duct, the cross-sectional geometry can be converted to hydraulic diameter using this page. The duct sizes on the air friction chart are expressed in which of the following? round. Use volume dampers for every branch to ensure proper distribution of air. 200° F Rated for heated and cooled air Heavy gauge housing Stronger motor than the competition Download. Shop Broan Transition in the Duct Reducers department at Lowe's. 9936 e-mail: [email protected] Spiral round and oval duct is available in longer lengths than rectangular duct,. [4], and Marco and Han [70]. Note that only aspect ratio up to 5:1 are selectable, as above this the results are not reliable. This "Equal-Friction" method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. DUCT DUCT Equivalent Friction Rectangular Ducts - Electro Industries DUCT DUCT Equivalent Friction Rectangular Ducts. This will be equal to the total CFM for the entire structure. 06" on most metal duct calculators FIELD DUCT SIZING CHART Rectangular sheet metal duct =. duct angular tap with. Eastern Sheet Metal App. A Rectangular Equal-Area Duct Traverse app is available on the Android Market (see link below). A round shape results in lower pressure drops and less fan horsepower to move the air and, consequently, smaller equipment. Better acoustic perf. This table assumes that elbows are not used. Wall Thickness. Offers galvanized steel construction. The Equivalent Round Duct Calculator app converts convert the dimensions of rectangular and flat oval ducts to round. The EMS load calculator gives duct sizes in round duct diameters. The coefficient for a three section elbow in SMACNA Duct Design Handbook is 0. The types of fittings to be used based on the designer's calculations of fitting losses (i. It has a power controlling system, motor controller, and fan’s blades. ASHRAE has assigned the square to round fitting the number SD 4-2. An equivalent diameter is the diameter of round duct that will handle the same amount of air (cfm) at the same friction loss as a given size of rectangular duct. This stands for. Charts for Braced Tra e, Duct, Cable Tra and Conduit S For the above example you would turn to section 3 and locate the charts that show wedge anchor connections to metal deck with concrete fill, in this scenario page 2-3 or. Calculation Method [Friction or Velocity] Round Duct Air Velocity [fpm] Rectangular Duct. Online Ductulator. round duct and fittings; spiral pipe. Rectangular sheet metal. Pacific Duct Inc’s estimating department comprises professional estimators who specialize in estimating the costs of the ductwork and fittings for your HVAC projects. Mixing characteristics of directly opposed rows of jets injected normal to a crossflow in a rectangular duct. MAS Duct Flow Calculators. Fibrous glass duct may follow Leakage Class 6 (at 2″ wg or less). etc) or use a ductulator to get the "FRICTION FACTOR" based on the required air velocity and duct size according to the area of. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. , office, residential, retail, school, hospital. Effective transitions from 3-1/4 in. - THD SKU# 939019. org spiral duct manufacturers association p. Duct extensions are necessary to make an even duct connection at the silencer inlet and outlet. Equivalent round duct diameter for a rectangular duct is calculated using equation 25. will have to be cut to fit, using the tin snips, in order to ø 4 s x 10 s rectangular or 6 s diameter round duct should. Title: Duct System Sizes and Airflow Quick Chart Created Date: 8/21/2006 11:56:03 AM. The recommended velocity is 1000 fpm as per Table 4. Unsealed flexible duct leakage average is estimated to be Class 30. ing would be required, which can create objectionable air−noise levels. 250] a = length of one side of rectangular duct (inch) b = length of adjacent side of rectangular duct (inch) De= circular equivalent of rectangular duct for equal friction and capacity (inch) Source: 2001 ASHRAE Fundamentals, p. Formula: d h = 2 × a × b/a + b. For conversion of round equivalents to rectangular sizes, use Table 2, “Equivalent Rectangular Duct Dimensions” from the same reference. rectangular duct and fittings are one part of our complete line of HVAC products. com E-mail: [email protected] The coefficient for a three section elbow in SMACNA Duct Design Handbook is 0. Rectangular sheet metal. 10 inches per 100 feet of a lineal duct. Round spiral duct is the best choice for duct construction, but if you don't have the room, flat oval is still a better choice than rectangular duct. The flexible type comes in rolls and is relatively easy to install on either round or rectangular ducts. This duct insulation guide discusses the reasons, materials and HVAC ductwork insulation costs. Hitung Duct dengan Mudah Unit System. For making the conversion, it is necessary to utilize a chart that gives the rectangular. Ductulator calculats duct dimensions using equal friction method or velocity method. 1 Toll Free (USA Only): 800-959-1229 RELEASED ON: 07/07. Brand Resources. DUCT CONSTRUCTION 9/15/99 INTERNATIONAL TRAINING INSTITUTE 1 Duct ConstructionDuct Construction Commonly Used Materials Galvanized Steel APPLICATIONS – Widely used as duct material for most air handlinggy systems. customary system. Enter Round Duct Diameter (inches), Duct Airflow (CFM), Duct Length and the number of bends. Round to Rectangular Adaptor 200 Ø Rectangular Duct Support Clip. Infill from bio-soluble acoustic grade glasswool or mineral wool, encased behind finely perforated galvanized steel. For making the conversion, it is necessary to utilize a chart that gives the rectangular. conductor pipe. 3 * (a *b) ^ 0. How to Evaluate Furnace Duct Work & Cure Short Cycling or Inadequate Ductwork Problems Examples of improper duct work: An 8” supply branches to 2 8” supplies. The Eastern Sheet Metal Rectangle to Round Duct Calculator App is used by sheet metal contractors and installers, HVAC engineers and contractors to quickly convert the following duct diameters: rectangular to round, oval to round, or rectangular to oval using the U. Duct Size Calculator Cfm. 2974 toll free: 877. The blower gives us a pressure rise. 36 with the flow direction along the x axis. Do not use less than a 6s diameter duct. The VariTrane Duct Designer program consists of three applications: Duct Configurator helps you model and size duct supply duct systems, Ductulator is used for equal friction applications, and Fitting Loss Calculator identifies the optimal fittings. 06" on most metal duct calculators. Round or oval ducts have advantages over rectangular ducts and this calculator app makes transitions easier. Rectangular ducts are usually sold in half sections; two pieces need to be ordered for a full duct section. Equivalent Duct Calculator. Chart 2 is based on 100 feet of pipe; therefore, you have to convert all elbows to an equivalent of pipe. Round to Rectangular Adaptor 200 Ø Rectangular Duct Support Clip. It calculate cost of HVAC duct such as rectangular, round and flexible ducts. FILTERLOCK Family. Use / Application of Factory-Built Grease Ducts • Alternative to code prescribed welded, carbon - Hydraulic flow calculation methods prove that round duct creates the same amount of flow volume as rectangular, but round stainless duct. We offer a complete line of rectangular to round transitions for spiral pipe. Equivalent round duct calc turns of proper duct installation ductwork basics hamilton home s round spiral duct for hvac systems does flex duct reduce airflow quora New Duct Sizing ChartDuctwork Basics Hamilton Home SDuct Sizing Chart Gallery Of 2019Eccoduct In Slab Duct Ventilation SystemHvac Duct Equivalent Size CfmPiping And Ductwork Systems Energy ModelsSizing Duct Ducts… Read More ». 1 inches of water (25 Pa). 1 Size round ducts installed in place of rectangular ducts indicated from ASHRAE table of equivalent rectangular and round ducts. Equivalent Duct Sizes for Same Friction Loss From: Typo, “Circulation” should be “Circular” Example: 12 x 7 Rectangular, 1000 cfm Solution: From Table A-2 , the Equivalent Round Size is 9. The chart is useful for visualizing the effectiveness of lined duct, as well as for doing a calculation of attenuation. How to Convert a Round Duct to Rectangular | Hunker In your home heating/air conditioning system, you have ductwork to push air through your home. duct should be in a straight section of duct with 10 straight equivalent duct diameters upstream, and 3 straight equivalent duct diameters downstream of the traverse plane, although a minimum of 5 duct equivalent diameters upstream and 1 duct equiva-lent diameter downstream may give adequate results. rev:01/08/10. 9 out of 5 stars 14. Marinsoft makes it easy for you to test drive Marinsoft Duct Calculator at your leisure with the fully functional evaluation version. Duct Equivalent Size calculator; Duct identification labels & Elevation labels; Straight Duct and Duct Runs Module. Each portion of a factory-made air duct sys-tem shall bear a listing and label indicating compliance with. Since 1946, Southwark Metal Manufacturing has established itself as one of the largest manufacturers of HVAC sheet metal pipe, duct, and fittings for residential and light commercial applications. The types of fittings to be used based. The types of fittings to be used based on the designer's calculations of fitting losses (i. Calculating the area of a rectangular duct line. 3 is interesting for its caution: “Use friction loss data characteristic of flexible duct. The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe. Title: Duct System Sizes and Airflow Quick Chart Created Date: 8/21/2006 11:56:03 AM. In order to help you we have devised our own mini calculation “apps” feel free to use them as much as you want, if you need any help please don’t hesitate to contact our technical gurus at MAS. 30 ((300 mm) (500 mm))0. ) (4MG71)? Grainger's got your back. SoftTouch™ Duct Wrap Insulation offers outstanding thermal properties that reduce unwanted heat loss or gain and condensation during system operation. The two largest values, i. The table below can be used to compare equivalent diameters for rectangular and round circular ducts , ductwork sizing , friction loss, sheet metal gauges, etc. In the extended plenum system (see Figure 7-3), a large rectangular duct extends straight out from the furnace plenum (hence the term extended plenum) and generally in a straight line down the center of the basement, attic, or ceiling. all duct stiffened by machine formed beads spaced at 12” o. 3 is interesting for its caution: “Use friction loss data characteristic of flexible duct. The EMS load calculator gives duct sizes in round duct diameters. 5 ton unit on a mobile home that's 13 x 60, I need to replace my duct system, what - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. Duct capacity required is 100 CFM, therefore, from chart, fan must deliver at least 100 CFM @ 0. Note that only aspect ratio up to 5:1 are selectable, as above this the results are not reliable. A round duct with a cross sectional area of 0. Hitung Duct dengan Mudah Unit System. 25 where D = diameter of equivalent circular duct (mm) a = dimension of one side of the rectangular duct (mm) b = the other dimension of the rectangular duct (mm) Using Excel, create a table that shows the relationship. Advantages – High strength, rigidity, durability, rust resistant, availability, non-porous, workability and weldability. 250] a = length of one side of rectangular duct (inch) b = length of adjacent side of rectangular duct (inch) De= circular equivalent of rectangular duct for equal friction and capacity (inch) Source: 2001 ASHRAE Fundamentals, p. For the triangular duct, D = 4*A/P, where A is the triangular duct cross-sectional area (1/2*base*height) and P is the triangular duct perimeter. was giving me problems, and the other duct transition pieces I found were. 6 (24#) and with the price from the manufacturer it calculates sub total form to obtain. ) Rectangular and Circular HVAC Ducts - Equivalent Diameter. Single Wall Round Submittal Precision Duct Systems 4570 Commerce Cir SW • Atlanta, GA 30336 Phone (404) 505-2542 Connection Types All fittings are made standard as male size (1/8” smaller) for slip fit into standard spiral ducts except for female coupling, which is made female size equivalent to standard spiral ducts. 9 inch Diameter to, friction loss is 0. Step 5 Select a size of square duct that has the same area. SECTION 23 31 11 HIGH PRESSURE DUCTWORK 23 31 11-4 13-HC1-033 B. Rectangular Ductwork Pipe (119) Round Ductwork Pipe (171) Spiral Ductwork Pipe (13) Duct Size. for Pricing (mm) Equivalent Round (mm) due to Friction Loss; H x W H x W H x W; 150 x 500: 381: 279: 150 x 555: 406: 297: 150 x 635: 457: 317: 150 x 710: 508: 332: 150. The length of the rectangular duct size would range from 0. If we enter Chart 5 (Masterclass Part 29) at the air quantity and rise vertically until the line intersects with equivalent duct diameter 609 mm we establish the fraction loss is 0. Tech Chart: Duct Size Chart Wednesday, July 1, 2015. Crossword Dictionary. Rectangular Sheet Metal Duct =. duct length of 3 ¼˝ x 10˝ rectangular or 6˝ diameter round duct should not ex ceed 140 equivalent feet. Charts for Braced Tra e, Duct, Cable Tra and Conduit S For the above example you would turn to section 3 and locate the charts that show wedge anchor connections to metal deck with concrete fill, in this scenario page 2-3 or. The AFG Flow Grid is available in two tube diameters and lengths (See Table 1). 6 Select an adaptor that will convert between the round and the square duct sizes from your local building supply centre; for example, our original 20 cm (8 inch) round duct should be mated to the 25 cm by 12. This table gives the size(s) of Flat Oval duct that will provide the equivalent volume to an ISO R20 standard circular duct diameter. 7 in-wc/psi) = 0. for all ducts between the supply fan and variable volume control boxes and 1” (250 Pa) w.