Free Hvac Duct Sizing Chart

Friction rate velocity friction rate.

Free hvac duct sizing chart. Convert diameter to rectangular equivalent. Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. 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. This free ductulator calculates the exact duct size round and rectangular for the given friction rate duct type and amount of airflow.

This hvac load calculator quickly estimates the size of your heating and cooling system in btu s. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Download free duct sizing chart pdf according to ashrae standard. 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.

The chart assumes the blower motor and total effective length of the duct system to be adequate for a 1 friction rate. 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. Convert rectangular duct to round equivalent. These duct chart are based on equal friction method with a friction loss value 0 1 inch 100ft.

Larger volumes or higher static pressures should be dealt with on an individual. Include fittings in the duct tel enter either. This hvac calculator is the closest estimate to the actual manual j calculation done by hvac pros. If ashrae 2013 is selected flexible roughness is 0 003 ft when straight and fully stretched tight at 0 compression adjusted at other compressions otherwise the.

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. It will automatically adjust the size to keep from exceeding the maximum manual d velocities for residential duct systems. In wg duct tel. 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.

Calculations are for 60 f dry air at sea level from 5 to 3000 cfm approximately standard air which is 0 075lb da ft.