Source 1 Product Catalog 2017 Page 171 Index

INDEX 171 The following duct sizes are based on a fraction drop of .10 inches per 100 feet of lineal duct. This Equal-Friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Larger air volumes or higher static pressures should be dealt with on an individual job basis. Residential Duct Sizing Guide Rectangular and Round Duct AIR VOLUME DUCT HEIGHT INCHES EQUIVALENT ROUND AIR VOLUME 4" 6" 8" 10" 12" 50 6 X 4 5 50 75 6 X 4 6 75 100 8 X 4 6 X 6 6 100 125 10 X 4 6 X 6 7 125 150 10 X 4 8 X 6 7 150 175 12 X 4 8 X 6 8 175 200 14 X 4 8 X 6 8 200 225 16 X 4 10 X 6 8 225 250 16 X 4 10 X 6 9 250 275 12 X 6 8 X 8 9 275 300 12 X 6 8 X 8 9 300 400 14 X 6 10 X 8 10 400 500 18 X 6 12 X 8 10 X 10 11 500 600 20 X 6 14 X 8 12 X 10 12 600 700 24 X 6 16 X 8 12 X 10 12 700 800 26 X 6 18 X 8 14 X 10 12 X 12 13 800 900 30 X 6 20 X 8 16 X 10 12 X 12 14 900 1000 22 X 8 16 X 10 14 X 12 14 1000 1100 24 X 8 18 X 10 16 X 12 15 1100 1200 26 X 8 20 X 10 16 X 12 15 1200 1300 28 X 8 20 X 10 18 X 12 16 1300 1400 30 X 8 22 X 10 18 X 12 16 1400 1500 24 X 10 20 X 12 16 1500 1600 24 X 10 20 X 12 17 1600 1700 26 X 10 22 X 12 17 1700 1800 28 X 10 22 X 12 18 1800 1900 30 X 10 22 X 12 18 1900 2000 24 X 12 18 2000 Driven Pulley Diam. = Motor Pulley Diam. RPM Driven Pulley RPM Driven Pulley RPM = Motor RPM Motor Pulley Diam. Driven Pulley Diam. Motor Pulley Diam. = Driven Pulley Diam. x RPM Motor RPM Motor RPM = Driven Pulley Diam. x RPM Motor Pulley Diam. Where: L = Length of Belt D = Diameter of Large Pulley d = Diameter of Small Pulley x = Center to Center Distance = 3.1416 L = D + d x + 2x 2 Useful Data Nominal Air Flow Cooling 400 CFM Per Ton Heating 12 CFM Per 1000 BTU Input Approx. Heat Values: BTUs Fuel oil/gal #1 = 135,800 #2 = 139,400 #3 = 141,800 Gas Pressure (Inches of water to ounces) 1 W.C. = .58 oz. 1.73 W.C. = 1 oz. 3.5 W.C. = 2 oz. 10.5 W.C. = 6.1 oz. 27.71 W.C. = 1 lb. Watts of Heat 1 Watt = 3.413 BTU. BTU = Watts x 3.143 Formula For Figuring Capacity in Gallons - Round Tanks Multiply Square of the diameter in inches by .7854. Multiply the result by length in inches, which will give you the volume of tank in inches, which will give you the volume of tank in inches. Since there are 231 cubic inches in one gallon you divide the inch volume by 231. The answer is capacity in gallons. ARI Conditions (Air entering) Evaporator 80F DB / 67F WB Condenser 90F DB Tools and Resources

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