Return Grill Sizes

Particle diameter opening size.

Return grill sizes.

Particle diameter strainers and filters mesh size vs. Accord ventilation white steel louvered sidewall ceiling grilles rough opening. It differs from a register because it does not have a damper to control airflow. We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5.

Do this by multiplying 2 5 x 144 360 square inches. Compare click to add item ameriflow 20 x 20 lay in return air white to the compare list. Multiply the lengths and widths of common filter grille sizes to calculate the square inches of each. The last step is to size the return grille and duct to match the total of the supply registers.

Homes will either have multiple small grilles throughout or a single large grille installed in either ceilings or walls. Add to list click to add item ameriflow 20 x 20 lay in return air white to your list. This is the required airflow through the return grille. Return a return draws air into a return duct system with negative pressure compared to the space usually via a fixed grille but.

Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing. 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. 400 fpm is the median air speed for this calculation.

Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs. First let s define some terms. The total of the supply registers in the pressure zone equals 340 cfm. Once you find one that meets or exceeds the above calculated needed number you can use it as your filter grille size.

Convert this measurement to inches. Menards offers a wide selection of baseboard ceiling floor and wall registers in a variety of sizes. 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.