Ductwork Sizing Chart

In wg duct tel. Link 1 and link 2. 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 6 100 125 10 x 4 6 x 6 7 125.

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Include fittings in the duct tel enter either.

Ductwork sizing chart. The chart should not be used to design complete duct systems. To size the ducts you re going to need a duct sizing chart. 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 unit and reasonable length duct runs.

Ductulator calculats duct dimensions using equal friction method or velocity method. We can use them to find the pressure drop per meter the. To size the branch ducts select the duct size at the intersecting lines of the friction rate and the room cfm.

It calculates both rectangular and round duct dimensions. The chart assumes the blower motor and total effective length of the duct system to be adequate for a 1 friction rate. As the trunks are reduced use the total cfm of the remaining downstream branches.

To insure proper distribution of air volume dampers must be used. If you don t have one you can find them in the following links. Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport ohio 43125 duct system design.

Convert diameter to rectangular equivalent. Larger volumes or higher static pressures should be dealt with on an individual job basis. Friction rate velocity friction rate.

Most technicians are skeptical about these numbers especially on the return air side of the system. Convert rectangular duct to round equivalent. It works with i p units united states united kingdom and metric units canada europe russia middle east asia.

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. The sizing chart is designed for estimating the airflow in an average system. These charts hold a lot of information.

You can obtain these from ductwork manufacturers or from industry bodies such as cibse and ashrae. And it shows the velocity and or static pressure loss of air for both types of duct shape. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.

Duct system sizes and airflow quick chart created date. Online ductulator free duct size calculator. For sizing the supply and return trunks select the duct size at the intersecting lines of the friction rate and the equipment cfm.