How do you size a return air grill?


How do you size a return air grill?

In order to determine the size of the tonnage you have, simply divide 980 by 400 CFM per ton. Doing this for this space will yield a tonnage of 2.45. Always round up and we have a tonnage value of 2.5. A return air grill should be sized for an air speed of 300-500 FPM(feet per minute).

What does a return air grille do?

Heating and Air Grilles The air return is a grille that serves one purpose – to pull air back into the central heating and air system for reuse.

What is the difference between a register and grille?

In simple terms, an air register is the same as a grille, but with adjustable dampers in it. Unlike grilles, which can be for both intake and release of air in a room, a register only serves the latter. An air register usually is used with air supply outlets feeding air into indoor spaces.

How big should return air vents be?

16 inches by 20 inches
A typical return vent is 16 inches by 20 inches, according to Hunker.

What is the difference between a register and a return?

Usually, a register is placed near a window or door, which is where the greatest heat/cooling loss occurs. In contrast, returns (grilled ducts which suck air back into the HVAC system for heating or cooling) are usually placed in the wall or ceiling nearest the center of the building.

What are return registers?

What is a Return Register? Often referred to as high/low vents, ducts, and grilles, return registers are pairs of registers located near the ceiling and floor of rooms throughout your home. They contain slatted openings. You can recognize these registers because they are usually bigger than a supply vent.

Where should air returns be located?

They must be correctly placed and unobstructed —Return ducts are usually placed in hallways, under stairwells, or in larger open areas of your home. This placement ensures that they will be able to pull in enough air to take back to the HVAC equipment.