Return Air Duct Size
An insufficient return system or one too large will reduce the efficiency of the heating and increase energy bills.
Return air duct size. The size of the filter at the air handler gives a clue about the anticipated size of the air return that equipment manufacturer expected to have. The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room. If the supply ducts are in the floor, then the return air should be located up high.
I had minimal register sizing but only had approx 2x5 holes cut in the floor for the air to pass through to the return duct, 6 of them for a 3 ton system. On the system depicted in figure 3 , there was no chance for return air to make it back to the equipment. Never locate ducts at the end of the trunk line run.
Your filter size at the actual air handler is 20 x 20 = 400 sq in of air return For the people with multiple room returns calculating return air square inches do not stop at the duct size rather floor joist config and register size. The last step is to size the return grille and duct to match the total of the supply registers.
Calculate the return duct size based on the air conditioner's size and the type of duct you are using. If the furnace is putting out 1,000 cubic feet per minute of air flow, the return system must collect 1,000 cubic feet and take it back to the unit. Flex duct has a higher pressure drop and as such may require the size shown on this guide be increased by 1 round size for up to 800 cfm and 2 round sizes
I use 1 inch pleated filters in them, and they have always seemed small to me, and irritating because they are odd size anyway. As the air moves through the duct, it encounters a reducer and then a smaller duct. For most systems, the minimum duct size (see table 1) is sufficient for up to 25 feet (8 m) with no more than three 90° bends.
Flex duct delivers 200 cfm. That’s right, your heating and air system is nothing more than a big circulation unit. In order to maintain velocity, reduce duct size.
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