Hvac Duct Sizing Calculator

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.

Hvac duct sizing calculator.

Sheet metal duct friction loss calculator. 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. Duct velocity calculate velocities in circular and rectangular ducts imperial and si units online calculator. Calculate the size of your ducts vents by multiplying the length by the width.

Include fittings in the duct tel enter either. Ducts diameter and cross sectional area circular ducts and cross sectional areas. Duct system sizes and airflow quick chart created date. In wg duct tel.

Read round duct diameter inches and friction loss per 100 of duct inches of water. If a room is 250 square feet the result will be a duct size of 8 inch round. Rectangular duct is rounded up to the nearest 1 4 inch. Additionally it provides equipment recommendation type heating cooling system appropriate for your home calculates the cost of installing the equipment including labor materials.

Unless within 2 the diameter is rounded up to the nearest inch. It will automatically adjust the size to keep from exceeding the maximum manual d velocities for residential duct systems. Convert diameter to rectangular equivalent. You can also do this by checking for them online or by using a manual that is sold by distributors.

Calculate the duct size by using a duct calculator. Convert rectangular duct to round equivalent. Friction rate velocity friction rate. 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. Step 5 divide the cmf per vent by the total amount of cmf for your furnace.