Standard Rectangular Air Duct Sizes

The hvac model that you re interested in should offer information regarding the maximum airflow per cubic foot per minute or cfm to help you determine adequate duct sizes.

Standard rectangular air duct sizes.

Smc tdc slip drive and raw sheet metal connectors inc. These duct chart are based on equal friction method with a friction loss value 0 1 inch 100ft. Download free duct sizing chart pdf according to ashrae standard. Master flow 24 in.

1 in 25 4 mm 1 inh2o 100 ft 84 mmh2o 100 m. Duct work is otherwise called as duct system. As well as in return air situations. The length of the rectangular duct size would range from 0 7mm to 0 9mm galvanised mild steel depending on size.

Half section rectangular duct model rd24x8x48 21 98 21 98. Sizing is based on airflow needs per cubic foot per minute as well as velocity. Air volume equivalent round air volume cfm 4 6 8 10 12 duct inches cfm 50 6 x 4 550 75 6 x 4 675 100 8 x 4 6 x 6 6 100. 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.

Rectangular duct and fittings are one part of our complete line of hvac products. Rectangular or square ducting comes in standard sizes ranging from 3 by 7 inches to 35 by 40 inches. Ducts are the conduits or passages used in heating ventilation and air conditioning hvac for delivering and removing air. Commonly used rectangular duct sizes in air handling ventilation systems.

Sheet metal connectors inc. The master flow 36 in. Galvanized steel flat sheet can be cut to size for a tough hvac job that. Duct size chart calculate duct dimensions for both rectangular and round ducts.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. All ductwork comes standard with stiffening beads. It maintains the most efficient characteristics for airflow and is common throughout the country. Larger volumes or higher static pressures should be dealt with on an individual job basis.