Cold Air Return Duct Size

If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on.

Cold air return duct size.

Sizing ducts for a heating system is a complex task. Therefore your return air duct and grill size will be 24 by 24 inches tip. 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. If the supply ducts are in the floor then the return air should be located up high.

Visual inspection for prior attempts to improve return air such as holes cut into an existing return air duct or worse openings cut to admit more makeup air into the air handler from an un conditioned space such as an attic or crawl area. Most technicians are skeptical about these numbers especially on the return air side of the system. Particle diameter opening size. Always place return ducts as far away from the supply air vents as possible.

Always stagger take off ducts by 12 to maintain pressure. Particle diameter strainers and filters mesh size vs. How much is the under sized return air duct reducing the efficiency of my new 95 furnace. Energy savers julie boleware julie boleware has been writing since 1997.

A mismatch in return air inlet grille or duct size will reduce the system s effectiveness. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. Never locate ducts at the end of the trunk line run. Last take off run to be located 12 18 from end.

In order to maintain velocity reduce duct size. A return draws air into a return duct system with negative pressure compared to the space usually via a fixed grille but also often called a return vent or a return intake vent or for some of you old school folks from up north the cold air return. Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs. This pulls the air across your body.

The air return duct is 12 x 19 228 sqin about 2 3 the area of the factory recommended air filter 14 x 25 350 sqin. 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. Use insulated duct or duct board in unheated spaces. Is our heat pump return register too small.

Flexible duct work must be stretched tightly for maximum air flow.