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Return air filter grille sizes.
We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5.
Grilles the function of a grille is to pull air from a room to return it to the heating or cooling system.
Submittal data 55 kb pdf engineering data 177 kb pdf engineering data free area chart 49 kb pdf.
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Particle diameter strainers and filters mesh size vs.
400 fpm is the median air speed for this calculation.
White return air filter grille model e190rf 20x20 40 76 40 76.
Find a decorative metal floor register that will match your home or office decor or go with a standard steel grille with white electro coated and powder coated finish.
Using those examples you would see their square inches are 280 400 and 400 respectively.
The air grille and vent cover selection from grainger includes steel metal and wood return air grilles and vent covers.
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Some of the common sizes include 20 by 14 25 by 16 and 20 by 20.
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Calculate the square root of the total.
Free delivery with 45 order.
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P 800 433 6341 f 800 223 8461 map.
Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs.
673 steel return air filter grille 1 2 fin spacing.
4 ton unit x 144 square inches 576 squared.
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.
Particle diameter opening size.
4 way wall ceiling register model e104m 10x10 16 28.
A return air grill should be sized for an air speed of 300 500 fpm feet per minute.
It differs from a register because it does not have a damper to control airflow.
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First let s define some terms.
Since from this example the furnace requires 400 square inches for your filter grille you may use either the 25 by 16 filter grille or the 20 by 20 filter grille.
Contact factory for sizes not listed.
Therefore your return air duct and grill size will be 24 by 24 inches.
The square root of 576 is 24.