Return Air Filter Grille Sizing Chart

One thing to remember is that you must have enough supply vents (vents blowing air out) and return vents (vent sucking warm air back in the air conditioner).
Return air filter grille sizing chart. Return filter grille specification chart. When shopping for a new filter, make sure you purchase one that is the same size, or it will not fit. The last step is to size the return grille and duct to match the total of the supply registers.
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 grille at low level: Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100.
The filter dimensions should be printed on the frame of the filter, length x width x height. Finding my air conditioner filter’s sizes. You may order a horizontal grille (blades run in the long direction) or a vertical grille (blades run in the short direction).
Application max recommended velocity (m/s) return air grille at high level: Use standard 1 thick disposable filters (not included) removable face for. Note also the return air grille sizing formula at the top of the chart.
It matters for some grilles. 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.
Return air grille for low noise level: 400 fpm is the median air speed for this calculation. “for the same 2.5 ton system with a filter grille, the grille size would need to be what size?” asked rick “we usually use a 20 x 20 for 2.5 ton.” said the tech 20 x 20 x 2 = 800 “800 cfm…well that’s big enough for a 2 ton, but a 20 x 25 may be a better choice.”