Return Air Duct Sizing Chart

While this may be true in most cases for a metal supply air duct it is not for a metal return nor a 6 flexible duct on supply or return.

Return air duct sizing chart.

Sizing ducts for a heating system is a complex task. Size of air conditioner example. These ductwork tips will help balance your air conditioning and heating system. Have to get the air back to the furnace.

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. Return air cfm must be equal or greater than supply air cfm. In order to maintain velocity reduce duct size. Return air ducting is necessary in almost every room.

Hvac ductwork sizing is critical for proper heating and cooling in every room. Use the following formulas. Table 4 2 return air duct installation sizes based on 05 inches of pressure drop per 100 ft round duct rectangular duct cfm dia. Particle diameter opening size.

Particle diameter strainers and filters mesh size vs. Duct system sizes and airflow quick chart created date. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs.

Tees split but do not reduce and an appropriate reducer must be added. Dampers on take off duct runs allow for adjustments of air distribution. 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. Calculate the return duct size based on the air conditioner s size and the type of duct you are using.

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