Residential Duct Sizing Chart

Residential Duct Sizing Chart. Size of Circular Duct For a circular duct, you'll first need the CFM rating of your system. Flex Duct, Ductboard, or Metal Duct Options..

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For sizing the supply and return trunks select the duct size at the intersecting lines of the friction rate and the equipment CFM. These duct sizings should be more than sufficient residential air conditioning and furnace heating applications. It will automatically adjust the size to keep from exceeding the maximum Manual D velocities for residential duct systems.

It will automatically adjust the size to keep from exceeding the maximum Manual D velocities for residential duct systems.

Size of Circular Duct For a circular duct, you'll first need the CFM rating of your system.

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Jot down this information, as you will need it later. Using an HVAC Duct Sizing Calculator. Select duct size using friction chart or duct calculator HOW: Using friction chart.