Return Air Grille Size For 5 Ton Unit
Specify a method for determining the size of the transfer grille or door undercut.
Return air grille size for 5 ton unit. We are after the ability to move 980cfm so you now divide this number by 400 fpm yielding 2.45 or 2.5. Your air conditioning filter and return air grill do more than just prevent particulates and odors from being recirculated. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room.
Specifically, it says the following: If that 14 round return is all you have it is undersized for your unit. It should be right at the unit return opening and if you have room use a deep pleated filter (accordian shaped), not a flat.
4 (ton unit) x 144 square inches = 576 squared. Therefore, your return air duct and grill size will be 24 by 24 inches.) “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.
The size of the return air grill depends on the size of the forced air fan. You need about 400 cfm per ton. You determine a return grille pressure zone required 340 cfm of return.
18.5 x 17.75] 4.7 out of 5 stars 151 $34.73 $ 34. A rough rule of thumb is to take the dimesions of the truck and times it by 6. Return air should be sized at 200 square inches per ton according to airmate and other filter grille manufacturers to achieve 2.0 static pressure.
Note also the return air grille sizing formula at the top of the chart. Calculate the square root of the total. What size is the return air duct, at the furnace or airhandler?
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