Ductwork Sizing Chart

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. For sizing the supply and return trunks select the duct size at the intersecting lines of the friction rate and the equipment cfm. To size the ducts you re going to need a duct sizing chart.

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Ductwork sizing chart. Most technicians are skeptical about these numbers especially on the return air side of the system. Ductulator calculats duct dimensions using equal friction method or velocity method. The chart assumes the blower motor and total effective length of the duct system to be adequate for a 1 friction rate.

Convert rectangular duct to round equivalent. Include fittings in the duct tel enter either. 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.

These charts hold a lot of information. 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. Friction rate velocity friction rate.

The chart should not be used to design complete duct systems. Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport ohio 43125 duct system design. 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. To insure proper distribution of air volume dampers must be used. Larger volumes or higher static pressures should be dealt with on an individual job basis.

Convert diameter to rectangular equivalent. And it shows the velocity and or static pressure loss of air for both types of duct shape. You can obtain these from ductwork manufacturers or from industry bodies such as cibse and ashrae.

Link 1 and link 2. If you don t have one you can find them in the following links. Duct system sizes and airflow quick chart created date.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. As the trunks are reduced use the total cfm of the remaining downstream branches. The sizing chart is designed for estimating the airflow in an average system.

Online ductulator free duct size calculator. We can use them to find the pressure drop per meter the. It works with i p units united states united kingdom and metric units canada europe russia middle east asia.