Return Duct Sizing Chart

Size of air conditioner example. 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.

Return Duct Size Instadeck Co

Table 42 return air duct installation sizes based on 05 inches of pressure drop per 100 ft round duct rectangular duct cfm dia.

Return duct sizing chart. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Return duct type. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more.

Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing method. It involves the heat output of the unit measured in british thermal units the air flow from its blower the number of vents and their location and the length of ducts needed to reach those vents. Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs.

Calculate the return duct size based on the air conditioners size and the type of duct you are using. 4 tons x 144 square inches return air duct in square inches. Most technicians are skeptical about these numbers especially on the return air side of the system.

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. Sizing ducts for a heating system is a complex task. How to size an air conditioner return air duct by julie.

Velocity classification of ventilation ducts recommended air velocities in ventilation ducts. Wxh wxh wxh wxh wxh wxh wxh wxh 80 6x6 7x5 9x4 90 7x6 8x5 10x4 100 7 8x6 9x5 11x4 125 7x7 9x6 11x5 13x4 150 8x7 9x6 12x5 15x4 175 8 8x8 9x7 10x6 13x5 17x4. Resduct residential air duct calculator v153.

Measure and verify the grille is pulling the required airflow from the conditioned space after the job is completed and the system has started. Larger volumes or higher static pressures should be dealt with on an individual. Use the following formulas.

Residential duct sizing guide the following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.

Return Air Duct Size Return Duct Sizing Chart A Steel Aluminum