Return Grill Sizes

Accord abrfwh2020 return filter grille with 1 2 inch fin louvered 20 inch x 20 inch duct opening measurements white 4 7 out of 5 stars 536 33 35 33.

Return grill sizes.

Particle diameter opening size. Menards offers a wide selection of baseboard ceiling floor and wall registers in a variety of sizes. The last step is to size the return grille and duct to match the total of the supply registers. Proper sizing and orientation of grilles registers and diffusers may seem like such a simple thing but it s an area where confusion and mistakes are commonly made.

Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs. Grilles the function of a grille is to pull air from a room to return it to the heating or cooling system. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing. Once you find one that meets or exceeds the above calculated needed number you can use it as your filter grille size.

Accord ventilation white steel louvered sidewall ceiling grilles rough opening. Particle diameter strainers and filters mesh size vs. First let s define some terms. This is the required airflow through the return grille.

Homes will either have multiple small grilles throughout or a single large grille installed in either ceilings or walls. We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5. Convert this measurement to inches. Do this by multiplying 2 5 x 144 360 square inches.

The total of the supply registers in the pressure zone equals 340 cfm. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Some of the common sizes include 20 by 14 25 by 16 and 20 by 20. Compare click to add item ameriflow 20 x 20 lay in return air white to the compare list.

A return air grill should be sized for an air speed of 300 500 fpm feet per minute. Return a return draws air into a return duct system with negative pressure compared to the space usually via a fixed grille but. It differs from a register because it does not have a damper to control airflow.