Hvac Duct Sizing Chart

Most technicians are skeptical about these numbers especially on the return air side of the system.

Hvac duct sizing chart. 1 and the charts below. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Find the sizes of main and branch ducts from the air flow rates and the velocities by using eq. Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.

Hvac calculations and duct sizing 2012 instructor. The method can be summarized to. Pdh online pdh center 5272 meadow estates drive fairfax va 22030 6658 phone fax. Select suitable velocities for main and branch ducts from the table below.

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. Step 4 determine the cubic feet per minute and duct sizes for all the rooms. Because of this hvac professionals and amateurs alike typically don t calculate the final hvac ducting size by themselves. If a room is 250 square feet the result will be a duct size of 8 inch round.

Calculate the duct size by using a duct calculator. Duct system sizes and airflow quick chart created date. Using an hvac duct sizing calculator your overall ducting size comes from combining the size cfm and friction loss of your home meaning it ends up being a pretty complicated calculation. You can also do this by checking for them online or by using a manual that is sold by distributors.

Larger volumes or higher static pressures should be dealt with on an individual.