Return Air Grill Sizes

400 fpm is the median air speed for this calculation.

Return air grill sizes.

First let s define some terms. The total of the supply registers in the pressure zone equals 340 cfm. Wxh wxh wxh wxh wxh wxh wxh wxh 80 6x6 7x5 9x4 90 7x6 8x5 10x4 100 7 8x6 9x5 11x4 125 7x7 9x6 11x5 13x4 150 8x7 9x6 12x5 15x4 175 8. The last step is to size the return grille and duct to match the total of the supply registers.

Size mm max recommended air quantity l s 600 150. Particle diameter opening size. 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. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing.

Step 1 open up the cabinet of your furnace to gain access to the service plate. Slimline return air grille door grille sizing. 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. Look on the plate to see how many btu or british thermal units your furnace puts out.

We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5. Make sure to check out the large selection of hard to find return filter grilles. One piece moulded adaptors are available for ceiling mounted applications or wall mounted where a suitable cavity exists. Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs.

An optional sheet metal frame is available for ease of removal and cleaning. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Particle diameter strainers and filters mesh size vs. This is the required airflow through the return grille.

We have worked extensively to provide high quality functional yet affordable vent covers for walls and ceilings on behalf of homeowners. A return air grill should be sized for an air speed of 300 500 fpm feet per minute. The grille is available in 2 sizes and 7 decorator colours. Application max recommended velocity m s return air grille at high level.

Proper sizing of the return air filter grille is required for the furnace to function correctly. Return a return draws air into a return duct system with negative pressure compared to the space usually via a fixed grille but. The air grille and vent cover selection from grainger includes steel metal and wood return air grilles and vent covers.