Hvac Duct Sizing Calculator

Read round duct diameter inches and friction loss per 100 of duct inches of water.

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. Convert diameter to rectangular equivalent. Friction rate velocity friction rate. It will automatically adjust the size to keep from exceeding the maximum manual d velocities for residential duct systems.

Enter duct airflow cfm duct velocity fpm duct length and the number of bends. Calculate the duct size by using a duct calculator. Sheet metal duct friction loss calculator. Step 5 divide the cmf per vent by the total amount of cmf for your furnace.

Convert rectangular duct to round equivalent. Additionally it provides equipment recommendation type heating cooling system appropriate for your home calculates the cost of installing the equipment including labor materials. Duct system sizes and airflow quick chart created date. In wg duct tel.

Include fittings in the duct tel enter either. If a room is 250 square feet the result will be a duct size of 8 inch round. Ducts diameter and cross sectional area circular ducts and cross sectional areas. 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. For example if the vents are 5 by 10 inches the total cmf for the vents is 50 cmf per vent. Calculate the size of your ducts vents by multiplying the length by the width. 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.

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. Rectangular duct is rounded up to the nearest 1 4 inch.