Hvac Return Vent Size

When your hvac system blows air into your home that changes the air pressure inside.

Hvac return vent size.

4 ton unit x 144 square inches 576 squared. Return shipment packing tips. Return vents don t have louvers. Your return vents are responsible for air pressure.

Larger and odd sized. Nominal size in x in approximately capacity cfm 10 x 4. Large floor vent and return sizes. If the paper is pulled toward the vent or you feel a suction effect it s a return vent.

The return vent is usually bigger than your supply vents because it s how the air handler sucks air into the hvac system. This article describes problems with return air inlet size location and ductwork. The square root of 576 is 24. Never block supply or return vents.

An hvac return air can be in the floor but they work much better on walls up about 7 feet. It s best to put them on an interior wall across the room from the supply duct. You can identify return vents by turning on the system fan and holding your hand or a piece of paper up. Hvac return air improvement guide.

400 fpm is the median air speed for this calculation. Convert this measurement to inches. How to increase hvac system return air to increase heating or cool air output by improving the flow of return air to the air handler. They are typically larger in size.

Registers are the most common type of supply vent. 2018 tim carter where can you put return ducts. Wicker baseboard register. The register shown above is a common aluminum adjustable curved blade one way 10 6 ceiling register.

Click or tap here to get free bids in hours from local hvac companies to have new return air ducts installed in your home. Diffuser a diffuser is a vent that has a smaller inlet and a larger face resulting in a lower face velocity than that of the inlet duct. Therefore your return air duct and grill size will be 24 by 24 inches. Do this by multiplying 2 5 x 144 360 square inches.

We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5. Air will move straight through registers and grilles. Home large floor vent and return sizes. A return air grill should be sized for an air speed of 300 500 fpm feet per minute.