Hvac Duct Sizing Calculator
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Read round duct diameter inches and friction loss per 100 of duct inches of water.
Hvac duct sizing calculator. Hvac calculator this hvac load calculator also known as btu calculator provides an accurate real world heat load estimate for both heating cooling. Unless within 2 the diameter is rounded up to the nearest inch. Convert rectangular duct to round equivalent. Calculate the size of your ducts vents by multiplying the length by the width.
Duct velocity calculate velocities in circular and rectangular ducts imperial and si units online calculator. Include fittings in the duct tel enter either. In wg duct tel. Enter duct airflow cfm duct velocity fpm duct length and the number of bends.
Duct system sizes and airflow quick chart created date. For example if the vents are 5 by 10 inches the total cmf for the vents is 50 cmf per vent. This ductulator uses the colebrook equation to calculate the smallest duct size acceptable for the selected friction rate and duct type that stays within the selected acca manual d recommended velocities. Step 5 divide the cmf per vent by the total amount of cmf for your furnace.
It will automatically adjust the size to keep from exceeding the maximum manual d velocities for residential duct systems. If a room is 250 square feet the result will be a duct size of 8 inch round. Field duct sizing chart rectangular sheet metal duct 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. Duct sizing equal friction method the equal friction method for sizing air ducts is easy and straightforward to use.
Residential air duct sizer and velocity calculator this free ductulator calculates the exact duct size round and rectangular for the given friction rate duct type and amount of airflow. Calculate the duct size by using a duct calculator. Convert diameter to rectangular equivalent. Friction rate velocity friction rate.
Rectangular duct is rounded up to the nearest 1 4 inch. You can also do this by checking for them online or by using a manual that is sold by distributors.
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