Return Grill Sizes

Particle diameter opening size.

Return grill sizes.

Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing. Particle diameter strainers and filters mesh size vs. A return air grill should be sized for an air speed of 300 500 fpm feet per minute. The total of the supply registers in the pressure zone equals 340 cfm.

Add to list click to add item ameriflow 20 x 20 lay in return air white to your list. Convert this measurement to inches. The last step is to size the return grille and duct to match the total of the supply registers. Some of the common sizes include 20 by 14 25 by 16 and 20 by 20.

Homes will either have multiple small grilles throughout or a single large grille installed in either ceilings or walls. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Multiply the lengths and widths of common filter grille sizes to calculate the square inches of each. We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5.

Accord ventilation white steel louvered sidewall ceiling grilles rough opening. 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. 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.

Grilles the function of a grille is to pull air from a room to return it to the heating or cooling system. Menards offers a wide selection of baseboard ceiling floor and wall registers in a variety of sizes. Once you find one that meets or exceeds the above calculated needed number you can use it as your filter grille size. First let s define some terms.

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. It differs from a register because it does not have a damper to control airflow. 400 fpm is the median air speed for this calculation.