Return Air Grill Sizes

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.

Return air grill sizes. Proper sizing of the return air filter grille is required for the furnace to function correctly. An optional sheet metal frame is available for ease of removal and cleaning. Slimline return air grille door grille sizing. Particle diameter strainers and filters mesh size vs.

Air intakes and outlets ventilation systems air intakes and outlets rules of thumbs. The last step is to size the return grille and duct to match the total of the supply registers. Particle diameter opening size. 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. The air grille and vent cover selection from grainger includes steel metal and wood return air grilles and vent covers. 400 fpm is the median air speed for this calculation. First let s define some terms.

Look on the plate to see how many btu or british thermal units your furnace puts out. 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. 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. Table 4 2 return air duct installation sizes based on 05 inches of pressure drop per 100 ft round duct rectangular duct cfm dia.

Buy return air grilles in shop. A return air grill should be sized for an air speed of 300 500 fpm feet per minute. Application max recommended velocity m s return air grille at high level. 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. 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. The grille is available in 2 sizes and 7 decorator colours.

Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing. We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2 45 or 2 5. Size mm max recommended air quantity l s 600 150.