Hvac Return Duct Sizing Chart

Return duct type. 4 tons x 144 square inches return air duct in square inches.

Trunk Duct Sizing Duct Sizing X Duct System Sizing Rectangular Duct

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.

Hvac return duct sizing chart. Size of air conditioner example. Always size return duct work at 5 static pressure use a duct calculator the more grill space the quieter the system will operate more efficient. Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.

Because of this hvac professionals and amateurs alike typically dont calculate the final hvac ducting size by themselves. Using an hvac duct sizing calculator. How to size an air conditioner return air duct by julie.

Resduct residential air duct calculator v153. Most technicians are skeptical about these numbers especially on the return air side of the system. Select duct size using friction chart or duct calculator how.

Your overall ducting size comes from combining the size cfm and friction loss of your homemeaning it ends up being a pretty complicated calculation. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. For sizing the supply and return trunks select the duct size at the intersecting lines of the friction rate and the equipment cfm.

This ductulator uses the colebrook equation to calculate the smallest duct size acceptable for the selected friction rate and duct type that stays within the selected acca manual d recommended velocities. David explains return grills return grill whistling. Calculate the return duct size based on the air conditioners size and the type of duct you are using.

As the trunks are reduced use the total cfm of the remaining downstream branches. Use the following formulas. Larger volumes or higher static pressures should be dealt with on an individual.

Ac Flex Duct Sizes A Radial Flex Duct System Like This One Has A

Ducts Sizing Velocity Reduction Method