Free Hvac Duct Sizing Chart

Residential duct sizing guide key points to remember when using this guide the sizing chart is designed for estimating the airflow in an average system.

Free hvac duct sizing chart. These duct chart are based on equal friction method with a friction loss value 0 1 inch 100ft. It will automatically adjust the size to keep from exceeding the maximum manual d velocities for residential duct systems. Convert diameter to rectangular equivalent. Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft.

Duct size chart calculate duct dimensions for both rectangular and round ducts. Duct system sizes and airflow quick chart created date. Larger volumes or higher static pressures should be dealt with on an individual. Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.

This free ductulator calculates the exact duct size round and rectangular for the given friction rate duct type and amount of airflow. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. This hvac load calculator quickly estimates the size of your heating and cooling system in btu s. Convert rectangular duct to round equivalent.

While this may be true in most cases for a metal supply air duct it is not for a metal return nor a 6 flexible duct on supply or return. Rectangular duct is rounded up to the nearest 1 4 inch. In wg duct tel. Friction rate velocity friction rate.

This hvac calculator is the closest estimate to the actual manual j calculation done by hvac pros. While a duct sizing calculator built for a specific type of ductwork is the best possible method for sizing ducts the attached chart can be used in most single story homes with a centrally located. Flex duct 05 on most metal duct calculator round metal pipe 06 on most metal duct calculators 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. Download free duct sizing chart pdf according to ashrae standard.

The heat load estimate is based on your climate region total square footage number of rooms or zones you want ceiling height insulation type number of windows and doors.