Return Air Grille Size For 3 Ton
A 14 round pipe is equivalent to 750 cfm's.
Return air grille size for 3 ton. Rfg/w series return air filter grille drawing (supplied with filter) economy 1” flange grilles: The return takes a 16x20 filter. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room.
1200 / 2 = 600 square inches one filter grill or the total area of all grills must equal at least 600 square inches of area to adequately supply the system with the air needed to operate. If the supply ducts are in the floor, then the return air should be located up high. There seems to be different data on the correct size duct for return sizing on a 4 ton unit.
Also, where is the return air filter, in the unit or in the return grille ? Calculating return grill size is really a velocity issue because. Specify a method for determining the size of the transfer grille or door undercut.
Your filter size at the actual air handler is 20 x 20 = 400 sq in of air return It worked for 13 years with my old 3 ton unit 10 seer. Regarding the 3.5 ton vs 4 ton the average square foot per ton is 400 so say the house is 1600 sqft a 4 ton unit should work great.the vacuum pump pull 2500 micron is not as important as did it hold at 2500.
Air registers & grilles are ordered by the size of the actual duct opening in the wall, floor or ceiling that the vent will fit into or cover, not the overall size of the existing vent cover! A filter grill should be sized for a maximum face velocity of 300 fpm. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing.
A return draws air into a return duct system with negative pressure compared to the space usually via a fixed “grille” but also often called a “return vent” or a “return intake vent” or for some of you old school folks from up north the “cold air return”. 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. What size is your ac unit, if its 4 ton, you would need two of these.
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