Return Air Grill Sizes

Return a return draws air into a return duct system with negative pressure compared to the space usually via a fixed grille but.

Return air grill sizes.

The air grille and vent cover selection from grainger includes steel metal and wood return air grilles and vent covers. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing. First let s define some terms. We have worked extensively to provide high quality functional yet affordable vent covers for walls and ceilings on behalf of homeowners.

Table 4 2 return air duct installation sizes based on 05 inches of pressure drop per 100 ft round duct rectangular duct cfm dia. Particle diameter strainers and filters mesh size vs. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Buy return air grilles in shop.

The grille is available in 2 sizes and 7 decorator colours. 400 fpm is the median air speed for this calculation. Make sure to check out the large selection of hard to find return filter grilles. The last step is to size the return grille and duct to match the total of the supply registers.

Particle diameter opening size. Step 1 open up the cabinet of your furnace to gain access to the service plate. Proper sizing of the return air filter grille is required for the furnace to function correctly. The total of the supply registers in the pressure zone equals 340 cfm.

We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5. 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. This is the required airflow through the return grille. Look on the plate to see how many btu or british thermal units your furnace puts out.

Slimline return air grille door grille sizing. A return air grill should be sized for an air speed of 300 500 fpm feet per minute. 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. Application max recommended velocity m s return air grille at high level.

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. Wall vents and return air grilles find wall vents return air grilles over 80 sizes for walls and ceilings baseboard returns air deflectors wall clips and custom grilles. One piece moulded adaptors are available for ceiling mounted applications or wall mounted where a suitable cavity exists.