Return Air Grille Size For 4 Ton
A) the slower the air is moving the better the filter can grab crap out of the air.
Return air grille size for 4 ton. This pulls the air across your body. The last step is to size the return grille and duct to match the total of the supply registers. Once you find one that meets or exceeds the above calculated needed number, you can use it as your filter grille size.
If your ductwork is slightly smaller than the diffuser size, you would have to open up another wall pocket, put a crosspiece at the top of the opening, cut out the bottom plate and connect it to the existing duct. Since the conventional wisdom of designing return grilles at 144 sq.in. Specify a method for determining the size of the transfer grille or door undercut.
Based on a 4 ton, would a 18 round flexible duct be sufficient cfm for a 4 ton unit? With only 423 sq in of return your air velocity through the grille would be just over 400 ft/min, a good number as far as noise is concerned. If it's flex it's 700.
X2011 | model/part # : Always round up and we have a tonnage value of 2.5. 48,000 btus is equal to 4 tons of air flow, 12,000 btus per ton.
4 (ton unit) x 144 square inches = 576 squared. Doing this for this space will yield a tonnage of 2.45. Not the total external frame size of the grille or register.
Multiply the lengths and widths of common filter grille sizes to calculate the square inches of each. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. “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.”
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