A flat oval duct system sealed to Class A is expected to leak 2 CFM100 ft2 of duct surface area. The chart is based on metal duct.
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Other radii and vaned elbows are available as needed.
Oval duct cfm chart. CFM 4 CFM 6 CFM 8 CFM 10 CFM 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12. 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 above 800 CFM to insure proper airflow. Because of new plumbing in a joist space there is no room for putting back a 6 in round duct in the joist space.
Elbows through 12 shall be die formed with stitch welded joints. Enter the Long Axis inches and Short Axis inches of the Flat Oval Duct. Algona WA 98001 ph.
Duct Type Friction Loss Rate Airflow Duct Type Length Airflow Duct Type Length Diameter Duct Type Length. Duct System Sizes and Airflow Quick Chart Created Date. This Equal-Friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.
Read computed values for Equivalent Round Duct Diameter inches. At a system leakage cost estimate of 175CFMyear the payback versus lined rectangular duct is less than seven years. 576 Flat Oval Spiral Duct Sizes More than any other spiral duct manufacturer in the world.
For a 20 WG system that is 94 CFM100 ft2 and 31 CFM100 ft2 respectively. Please provide CFM Please enter only numbers for CFM Minimum value for CFM is 30 Maximum value for CFM is 100000 Friction Lossper 100ft of duct Please provide Friction Loss Please enter only numbers for friction loss Minimum value for friction loss is 01 Maximum value for friction loss is 10. Using a oval area calcualtor the area of the duct drops from 196 sq feet to 145 square feet when ovaledthis is aproximate.
Provide inputs in the blue boxes other inputs optional. Larger volumes or higher static pressures should be dealt with on an individual job basis. To change the size first note the equivalent round size listed for 18 x 34 it is 257.
Oval 4- 3 rectangular 4- 6 standard gauge tables round 5- 1 oval 5- 2 rectangular 5- 3 joint connection options round 6- 1 oval 6- 2 rectangular 6- 3 seam options round oval 7- 1 rectangular 7- 2 product descriptions singlewall round duct 8- 1 singlewall round fittings 8- 2 doublewall round duct 8- 11 doublewall round fittings 8- 12. 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. Duct System Design Guide First Edition 2003 McGill AirFlow Corporation McGill AirFlow Corporation One Mission Park Groveport Ohio 43125 Duct System Design.
ACCA Manual D the foundational standard for designing duct systems in our industry provides ample engineering data to calculate oval duct airflow. 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 lbmft3 D Number of. Failure to do so will result in high velocity and very likely loss of airflow.
Elbows 14 through 30 shall be. Next find 257 for a flat oval with a smaller minor axis. Humidity 400 CFMton SHR above 85 17º TD Low humidity 450 CFMton CFM Total Heat Equation CFM BTUHr 45 x H x ACF Sensible Load 108 x TD x ACF Friction Rate used in duct calculators Friction Rate Pressure Drop is the available static pressure ASP allocated to the duct work.
Actual Size gives the true duct major axis including. I am having HVAC duct work done. Flex duct 05 on most metal duct calculator Round metal pipe 06 on most metal duct calculators FIELD DUCT SIZING CHART.
Standard elbows will have 15 centerline radius. The hvac man wants to distort the 6 inch duct into the 45 by 7 inch remaining space. AllDuctCalc - HVAC Air Duct Calculator v2 Updated 102615.
Diameter of a round duct that equates to the same pressure loss as the corresponding flat oval duct. 19 Available Minor Axis Unlimited Sizes Available in Longitudinal Seam Construction Major axis sizes shown below are rounded off to the nearest whole number per industry standard. FIELD DUCT SIZING CHART Rectangular sheet metal duct 07 on most metal duct calculators Step One - Identify the volume of air that will be passing through the duct Step Two - Select the duct size from the table that can carry that volume of air Step Three - If desired airflow exceeds the CFM rating increase to the next duct size Step Four.
All round spiral duct and fittings shall be manufactured from G-90 galvanized steel conforming to ASTM and SMACNA standards. Change 18 x 34 flat oval to a smaller size. Equivalent Round Duct Diameter for Flat Oval Opening.
Or in other words the CFM on the oval duct design charts that our Dads gave us doesnt show up once the ducts are buried in the walls. SHR 80 to 85 19º TD Ave. This means 18 x 34 flat oval spiral duct will have the same friction loss as 257 round spiral duct.
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