all duct stiffened by machine formed beads spaced at 12” o. Select an adapter that will convert between the round and the square duct sizes from your local building supply center; for example, our original 8-inch round duct should be mated to the 10-inch by 5-inch rectangular duct because they have the same cross-sectional area. Sheet Metal Connectors, Inc. For instance, a 24x12 in. there are several reasons for specifying round ductwork. 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. Velocity Enter either: CFM: or Duct Size: CFM: Convert Rectangular duct to Round Equivalent. Rectangular and round duct fitting components available. The area will cover a two-dimensional slice of the duct. air velocity by the cross section area of a duct, you can determine the air volume flowing past a point in the duct per unit of time. After obtaining the Flow Velocity from the previous procedure, that figure is now multiplied by the Duct Cross Sectional Area to determine the Air Flow in CFM. Houston, Texas 77029 Phone: (713)678-8471 Sheet Metal Connectors, Inc. 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. wg static pressures. It will also convert rectangular to flat oval. Read computed values for Equivalent Round Duct Diameter (inches). Air Duct Calculators HVAC - Air Duct Calculators - function. duct conversion calculator free download - Conversion Calculator, Duct Calculator, Duct Calculator, and many more programs Obtain swiftly a diameter or a rectangular size (rounded in Rectangular ductwork is known to leak far more than round and flat-oval duct. 9mm galvanised mild steel depending on size. Nordfab Transitions feature a round Quick-Fit (QF) end and a square or rectangular end for transitioning from round to rectangular ductwork or for use as a hood. Another factor to consider when deciding between round and rectangular is the system pressure. round duct with insulation takes up 18 in. Result will be displayed. Use this Broan Rectangular to Round Transition for attaching duct in the top and discharge openings on range hood. - Louvre sizer module to size louvre opening required for structural opening. - Duct converter module to convert duct sizes between round, rectangular and oval duct. Table 4 gives this data, converted to SI units. . 7 in-wc/psi) = 0. We offer a large selection with great prices on all range hoods products. Flat Oval Spiral Pipe is fabricated in spiral lock seam or longitudinal welded construction. Pittsburgh longitudinal seams require mastic inserted into the pocket, stretching from end to the round duct than the rectangular one. With this likelihood it’s Duct work is otherwise called as duct system. 12. Usually, you can see only the outlet, which is a register covered with grillwork. This means that in tight spaces, round hvac ducts just won’t fit. ). 26. Broan 3-1/4 in. This is a handy tool when deciding what size duct you want to use for your application. Use our Transition Styles form to easily specify the product you need. duct fabricated using pittsburg seams. 8 inches water gauge per 100 ft duct (6. IMPERIAL 6-in x 6-in Galvanized Steel Round Duct Elbow. $498. TECH TIP # 47 . S. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. tdc cnt-jnt-condu-loc @ tdc connector center of duct & @ tdc connector HVAC Rectangular to Round Duct Equivalents Chart. The rangehood mounts undercabinet leaving no room to convert square to round outside 3) Design a duct system capable of distributing the required cfm. 140 feet, a transition adaptor should be used to convert the ductwork to seven or eight inch round duct. Calculate required porosity for air porous fabric Ducts are first sized as round and then the equivalent rectangular and oval sizes are In the case of rectangular ducts, tables are provided for converting round that round spiral duct usually weighs, on average, about 30% less than rectangular duct? Rectangular duct often costs 50% more . Item # 36401 | Model # GVL0031-A. Your current cart contains a quote. A. 625 / (a +b)0. ROUND AND RECTANGULAR DUCTWORK Harrison Machine & Plastic offers a complete line of round ducting from 2" to 60" and custom rectangular or square ductwork from 6" x 8" up to 30" x 96". 06" on most metal duct calculators FIELD DUCT SIZING CHART Rectangular sheet metal duct = . They compared a 6” round duct to two forms of oval duct made from a 6” round: 3” x 7. cross-section, the concept of 'equivalent diameter' of a circular duct has been extensively used. and Khodabakhsh, F. 5 square inches 3-1/4 x 12: 39 square inches. Side 1: Round to Rectangular Duct. 003 ft when straight and fully stretched tight at 0% compression (adjusted at other compressions), otherwise the original method of constant 0. Given: 12” round 7" round: 38. Universal Metals. Condensation. 4 psi or less, often much less. Flexible duct work must be stretched tightly for maximum air flow. Side 1: inches Side 2: inches . We offer a complete line of rectangular to round transitions for spiral pipe. 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. 3. HVAC Systems & Components Heating Ventilating Air Conditioning HVAC. It is much easier to seal and can easily be specified to meet SMACNA Class 3 Leakage even at 10 in. system. However, at high frequencies there is no particular advantage from the round duct, see Ver (1983b) and Scott (1985). The following is a typical HVAC Rectangular to Round Duct Flow Equivalents Chart. 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. 07" on most metal duct calculators Step One - Identify the volume of air that will be passing through the 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. Provided by . x 10 in. 8,520 = conversion factor to. duct with insulation is only 14 in. Duct Size Round To Rectangle Posted by Rozella Calise on October 04, 2018 AIR FLOW IN DUCTS Shaharin Anwar Sulaiman Round Or Rectangular Air Duct Calculator HVAC FIELD DUCT SIZINGCHART-s By Navid Anari Ductwork Design Program I'm renovating my basement and the big round 7" ducts that cross under the ceiling joists are in the way. Flat oval duct has been designed for restricted space conditions that cannot accept round spiral duct. com's Air Flow Conversion Calculator. Since both round and rectangular ducts are used in air conditioning distribution systems, it is quite possible that a contractor may wish to substitute one for the other while working on new construction or modifying an existing system. Duct type: Metal Ductboard Flex Size by: Friction rate. Enter the Length (inches) and Width (inches) of the Rectangular Duct. Allows you to convert between Kair SYS-125 125mm round and 150mm x 70mm rectangular ducting systems. 4) Solve for the Save for later. The duct surface area is the the inner circumference multiplied by the length of the duct. H: W: in, ft, mm, cm, m. Keep your working environment odour free with ducting at Screwfix. 01 ft roughness is used. Round ducts have virtually no wall deflection in normal operating conditions, and the helical spiral seams strengthen the duct even more. 05" on most metal duct calculator Round metal pipe = . For the 24” side of our sample rectangular Description goes here Duct Direct 8610 Wallisville Rd. I want to calculate: rectangular to round. Information provided is to be used as a guideline only. Easy to fit and durable. How to Calculate Round Duct Area to Square Feet? (self. The app is available for Apple and Android systems. 7mm to 0. 3 x (a x b)0. “Round spiral duct is more economical to install – that is on medium or high pressure duct system,” Murray says. Two 6" ducts are (2 x pi r squared) 56. 30 \times \frac{(a \ Square to round transitions provide a transition from rectangular duct to round pipe. SMC manufactures coil line ductwork in 4’-5’-6’ lengths. (13). Download the User Guide 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. @article{osti_33263, title = {Equivalent round diameter of spiral flat oval ducts}, author = {Townsend, B. diameter of an equivalent circular duct to give the h height of a rectangular or flat-oval duct . First, rectangular ducts are generally manufactured with two Pittsburgh seams, since two L-sections of rectangular duct are typically assembled to make the single duct piece. flat oval single wall duct and fittings are one part of our complete line of HVAC products. Features: • Available in a wide range of custom dimensions: round connections for 4, 5, 6, 8, 10, 12, or 14-inch diameter duct; rectangular dimensions from 6 to 24 inches in half-inch increments, depending on the circular For the circular duct, D is simply the duct diameter. We are a next generation supplier of hard-metals to the aerospace industry as well as other critical application industries. and Idem, S. Rectangle Duct. round horizontal duct opening. leakage” should be twice as much for rectangular duct . Simple calculator for calculating the area of a rectangular duct online I am installing a new range hood for our kitchen. To then convert that to volume, you multiply the resulting area by the length. of space. Determining Equivalent Round/Rectangular Ducts . Determining Duct Cross Sectional Area. 20 Jan 2018 I bought a good rangehood which has round ducting. The above expression is obtained by equating the gas flow equations for a round and circular duct. 3 Manufacturer of lock-seam, high pressure spiral pipe and fittings. ) Round Duct Diameter for Equivalent Pressure Loss at Standard Conditions. 4. Good, Better, & Best Duct Design Round Duct Flat Oval Duct Rectangular. 4) Select a fan . high, but a 16-in. The FlatPack Low Profile Duct System is the ideal alternative to 150mm round PVC pipe commonly . 09 to . customary system (inches, feet, etc. Rectangular Duct. 19 Dec 2016 Round or oval ducts have advantages over rectangular ducts and this calculator app makes transitions easier. It was not until the 19th century that sheet metal use became more common, especially in roofing, thanks to the development of rolling methods which made the material less costly. Flex duct has a higher pressure drop and as such may require the size shown on this guide be increased by 1 round size for up to 800 CFM and 2 round sizes 2 Fluke Corporation How to make a duct traversal airflow measurement Inserting the measuring device To determine the insertion depth of the measuring device, reference the following tables. 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. I see what we could usually use a register boot but there is not enough space between the exhaust and the vent. }, abstractNote = {Friction factors for spiral flat oval ducts were measured over the Reynolds number range 6 {times} 10{sup 4} to 6 {times} 10{sup 5}, based on hydraulic diameter. 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. 10 Example Convert rectangular duct 22" x 12" to equivalent round a = 22, b = 12; from above table 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. 71” and 3. There are two different equations for determining the Duct Cross Sectional Area, one for round ducts and one for square or rectangular ducts. Allows you to convert between Kair 150mm round and 220mm x 90mm rectangular ducting systems. Offers easy installation. Equivalent Diameter: Diameter of a round duct that equates to the same pressure loss as the corresponding rectangular duct. 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. 009 No. 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. Thickness "T" D Fitting: FRP Fitting Standards. HVAC Rectangular to Round Duct Equivalents Chart. 2012 nick: markprevwhist Convert round ductwork to oval ductwork Duct Settings The branches below Duct Settings (Conversion. Formula: d h = 2 × a × b/a + b. Square to round transitions provide a transition from rectangular duct to round pipe. oblong end we just Master Flow 4 in. This online ductulator calculates the dimensions for both round and rectangular duct options (one dimension should be entered by the user for rectangular duct). (SMC) TDC, Slip/Drive and Raw Sheet Metal Connectors, Inc. to 7 in. 125 Round Ducting Reducer 125-100mm - 99431 - from Toolstation 100 Round to Rectangular Adaptor 100mm - 55565 - from Toolstation Results 1 - 24 of 208 A rectangle to round and round to oval conversion chart is available, see our Spiral Catalog. Use insulated duct or duct board in unheated spaces. Duct Board, Insulation and Wrap Duct Hardware Ducting and Sheet Metal Rectangular Duct . I've got two 6" round ducts in a closet that are taking up too much room. - Irregular Shaped duct sizing module with built-in polygon shape builder. 25" by 12" flat rectangular ducts, so that the ceiling can be We Have a Variety of Adaptor Such As Square to Round Ducting Adaptors Round to Rectangular Duct Adaptor or Duct Conversion and Angle, flat bar flanges available. Duct areas in square feet can be calculated by using geometry rules for round areas. The length of the rectangular duct size would range from 0. 25-in x 10-in x 7-in Galvanized Steel Straight Stack Duct Boot at Lowe's. The calculation above is only any use if we are transitioning to a square end. This opened the door for the use of sheet metal for ducting. If we want a rectangular i. 25 inches water column is equal to (0. A transition connects square or rectangular duct to a round pipe or round flexible duct. Products 1 - 48 of 230 Shop everything from duct boots, elbows, reducers & more at the Square to Round Adaptor Register Vent Boot with Adj. A big part of any HVAC project is calculating duct flows, pressure losses, converting duct flow volumes etc. Round duct has less surface area, weight and fewer joints than rectangular duct. 25” x 7. Kair System 125 (SYS-125) Rectangular Ducting Convert rectangular or annular cross-section to hydraulic diameter. Rectangular to 8 in. T. Pittsburgh longitudinal seams require mastic inserted into the pocket, stretching from end to If selected, Flexible roughness is 0. Flexible Duct and Sheet Metal Connector Splice Collar. The table is based on the ducts friction loss formula. Round Duct Round Duct Offset Rectangular Duct Rectangular Duct Offset Fluoropolymer Barrier FRP Duct/Pipe. tdc duct constructed per smacna standards-first edition 1995 2. Duct Friction in Straight Duct . Round ducts take up more height than do rectangular or square ducts. 1 m, and for a round duct: 815 mm in diameter, 22-gage spiral wound duct, and Broan 3. Flex duct = . I'd like to convert them to 3. 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. A llows connections from rectangular grilles to round ducting. • The chart is based on metal duct. 03. Convert Diameter to Rectangular Equivalent . 3) If necessary, convert the round ducts to rectangular ducts. Find range hood duct transitions and other accessories at VentingDirect. 1 psi equals 27. Made in the UK using high- quality A simple volume unit converter to convert air flow volumes from one unit to another. Built-to-order square to round ceiling box transitions. Equivalent Round Duct Size for a Rectangular Duct Equivalent round duct size for a rectangular duct can be expressed as Deq = 1. in. duct work to be sealed per smacna hvac table 1-2 5. Model# B90E4. Online calculator to calculate the area of a rectangular duct. calculators, engineering calculators. A duct system is a network of round or rectangular tubes—generally constructed of sheet metal, fiberglass board, or a flexible plasticand- wire composite—located within the walls, floors, and ceilings. is selected, the right panel lists oval. As a result, spiral duct systems usually weigh 30% less than equivalent rectangular duct systems — less material! Spiral ducts are normally produced in longer lengths than rectangular ducts. 009 Convert Round Duct Size to Rectangular Duct Size for equivelant airflow. duct conversion calculator free download - Conversion Calculator, Duct Calculator, Duct Calculator, and many more programs Obtain swiftly a diameter or a rectangular size (rounded in TIME: 24. All ductwork comes standard with stiffening beads. 810 Cold air boot, collar, duct 45- 65’ EL AIR FLOW DYNAMICS & DUCT SIZING REFERENCE GUIDE SUPPLY OR RETURN DUCT SIZE/CAPACITY (. I'd like to convert to a flatter rectangular duct (in the closet portion only) to save some room. We are committed to setting industry leading standards in all measures of business performance and customer service. 5 cm (10 inch by 5 inch) rectangular duct because they have the same cross-sectional area. If selected, Flexible roughness is 0. For the circular duct, D is simply the duct diameter. A rectangular to round transition adapter must be used. EQUIVALENT DUCT CALCULATOR APP USER GUIDE Introduction Round is the most efficient duct shape for transporting air. The base is a rectangular (different dimensions for length and width). A symmetrical rectangle to round transition. e. You have a little more area in the rectangular duct, so you should have no problem. Rectangular Ductwork, Plenums, and Takeoffs Select from the menu below to view any of our product lines. Their measurements showed that those two sizes of oval duct are equivalent to round duct at 5. The hydraulic diameter, DH, is a commonly used term when handling flow in non- circular tubes Secondary flows can be observed in non-circular ducts as a result of turbulent shear stress Channel of water or partially filled rectangular duct. 7 inches of water gauge; a common duct pressure of 0. When a designer sees rectangular duct on a drawing, they should convert it to flat oval duct can be converted to the even more efficient shape of round, if the. • To insure proper distribution of air, volume dampers must be used for all branch runs. PRODUCT MAS Duct Flow Calculators. 18”, respectively. Ductwork from PVC, CPVC, PP, and PVDF materials for your round or rectangular ductwork system. 25 divided by 27. com. If you add an item to the cart, the existing quote items will be removed. Note that only aspect ratio up to 5:1 are selectable, as above this the results are not reliable. Convert rectangular and oval duct geometry to a equivalent circular diameter Convert rectangular and oval duct geometry to a equivalent circular diameter - online calculator with imperial and SI-units. Pittsburgh longitudinal seams require mastic inserted into the pocket, stretching from end to You want to know if you can change an existing rectangular duct system to a round duct system in Revit Solution: When you select an entire duct system in Revit, you are selecting a number of different families at once (duct, elbows, tees, diffusers, etc. 32. 02” and 5. 57”. A duct system is a network of round or rectangular tubes—generally convert to static pressure, which offsets the friction loss in the succeeding section of duct. Rectangular and Round Duct Rectangular Duct Height (inches) Duct work is otherwise called as duct system. Round Transition-413 - The Home Depot Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. (37) . The Eastern Sheet Metal Equivalent Round Duct Calculator app allows sheet metal contractors and installers, as well as heating, ventilation and air-conditioning (HVAC) engineers and contractors, to convert the dimensions of rectangular and flat oval ducts to round. (42). It can also become unappealing to the eye when trying to connect the fan coil to the main duct, which means connecting round to square duct openings. Nav Item; Nav Item; Nav Equivalent Diameters for Rectangular and Round Circular Ducts An approximate friction loss of 0. Proper transitioning from 3-1/4 in. The table below can be used to compare equivalent diameters for rectangular and round circular ducts. Figure 1: Duct breakout transmission loss for a rectangular duct: 305 mm by 1220 mm in 22 gage, length 6. 25 Where • Deq = equivalent diameter • a = one dimension of rectangular duct (inches ) • b = adjacent side of rectangular duct (inches) Equations for Flat Oval Ductwork For instance, a 24x12 in. round to rectangular. Always stagger take-off ducts by 12" to maintain pressure. type for flexible duct for branch ductwork (Flex Duct Round. size of spiral ducting when you have only been given the rectangular duct Equivalent Round Duct Diameter for Rectangular Opening This tool can be used to work backwards to convert a Round Duct Diameter to an Equivalent Flat Air Flow in CFM (Q) = Flow Velocity in Feet Per Minute (V) x Duct Cross Sectional Sectional Area, one for round ducts and one for square or rectangular ducts. Manrose Round to Rectangular Connector Elbow 90° Bend Adaptor White 100mm ENGINEERING. Enter value, select units and click on calculate. This product is proudly made in the USA using galvanized steel construction for durability and rust prevention. Circular Duct. The output also includes air velocity when air static loss is an input (friction method) or it includes air static loss when velocity is an input (velocity method). A Ductulator helps you properly size your ducts, estimate air loss, find the round or rectangular duct equivalent, and determine velocity. Input Rectangle Duct Depth (in. 716-473-5786 • 716-473-2150 fax 1 oval duct. Align the correct air quantity (CFM) with the friction loss to calculate velocity, round duct diameter and rectangular duct diameter. Equivalent Round Duct Calc App; Please provide Rectangular Width Please enter only numbers for Rectangular Width Minimum value for Rectangular Width is 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. Round ducting is often found -- it pushes air more efficiently Equivalent diameter for rectangular and circular ducts - air flows between 100 The equivalent diameter is the diameter of a circular duct or pipe that gives the . TAB "Rect to FO & Round" calculates equivalent flat oval and round for a given rectangular duct cross section TAB "Rect to FO & Round" calculates multiple round conduits based upon "equal friction" and "equal velocity" TABS "Equal Velocity" and "Equal deltaP" is used to make calculations for "Rectangular to FO & Round" = surface area, inch2 Rectangular ductwork is known to leak far more than round and flat-oval duct. 21. Contact Us: (844) 289-0033 Convert Rectangular duct to Round Equivalent . The Eastern Sheet Metal Rectangle to Round Duct Calculator App is used by sheet metal Duct areas in square feet can be calculated by using geometry rules for round areas. Therefore, if you use an equal area conversion from round to. 90° Round Adjustable Elbow. Other Hart & Cooley Mobile Tools. The duct exhaust at the top is 8" circular, but our old vent to outside is 10"x3. OUR TOOLS ALLOW YOU TO EVAULATE MANY CALCULATIONS: Convert Volume Flow Rate; Convert Duct Types to round, oval, or rectangular; Perform Velocity Pressure Conversion wg. 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 Convert Round Duct Size to Rectangular Duct Size for equivelant airflow. Round or oval ducts have advantages over rectangular ducts and this calculator app makes transitions easier. The wall vent is just 1-2inches above the exhaust vent flange. --- Select a Product Line --- Round Pipe and Pipe Fittings Collars for Sheetmetal Collars for Ductboard Boots and Boxes Rectangular Ductwork, Plenums, and Takeoffs Wall Stack & Wall Stack Fittings Oval Pipe & Oval Fittings Mobile & Modular Rectangular ductwork is known to leak far more than round and flat-oval duct. Ideal Round Duct Diameter . 10 pressure drop per 100’ EL) CFM Round (No. design versus converting all low pressure ducts to. Hangers for IMPERIAL 6-in x 6-in Galvanized Steel Round Duct Elbow. So if you still look at spiral flat oval duct as an expensive rectangular duct with the corners rounded off, you need to move out of the 1980’s and see the changes that have taken place in the Items to consider: air movement efficiency, acoustic performance, cost and aesthetics (if exposed) Round duct: Advantages 1. The Eastern Sheet Metal Rectangular Fire Rated Round Rectangular ducts and fittings are produced as per SMACNA All ducts, transformation pieces and their respective fittings. rectangular duct and fittings are one part of our complete line of HVAC products. Efficient way of conveying air with low pressure drop, which translates to less fan horsepower. hvacadvice) To convert to feet, divide by 144 (144 is the number of square inches in a square foot) Sheet Metal Connectors, Inc. We Have a Variety of Adaptor Such As Square to Round Ducting Adaptors Round to Rectangular Duct Adaptor or Duct Conversion and Angle, flat bar flanges available. 0. Find quality duct transitions & connectors online or in store. c. Smooth Inside 14” x 9” rectangular duct. notes: 1. Used by trainers, educators and technicians to get the following information: - Friction - Velocity - Round Duct Size - Rectangular Duct Size. Would a 3"x20" rectangular duct (giving me 60 sq ins of area) be the same thing in terms of air flow? Shop duct transitions & connectors in the hvac duct & fittings section of Lowes. It can prevent some costly errors and is great for • The chart should not be used to design complete duct systems. Converting a rectangle to round sheet metal duct work is something that is common in HVAC. A round shape results in lower pressure drops and less fan horsepower to move the air and, consequently, smaller equipment. ), making the type selector at the top of the properties box unavailable. 173. Top and base are parallel. Let’s assume we have a sample duct with sides measuring 24” x 15”. 4005 Rigid Fiberglass – Preformed Round Ducts –. clear. Round to Rectangular Horizontal Adapter. One thing they found is that the straight duct itself moves less air than the same size round duct. Friction Loss Calculator for Sheet Metal Ducts · Equivalent Duct Calculator ( Round vs Rectangular) · GRD Cross Reference Calculator. 5" rectangular. In your home heating/air conditioning system, you have ductwork to push air through your home. Equivalent Duct Calculator. - rhoAIR module to find air density and other pyschrometric air properties at state point. Model# FC6. 6 Pa/m) is used. 52 square ins of area. round to rectangular duct conversion

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