Return Air Grille Size For 4 Ton
Once you find one that meets or exceeds the above calculated needed number, you can use it as your filter grille size.
Return air grille size for 4 ton. 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. You are only going to get as much air out as you have coming back. The return takes a 16x20 filter.
Multiply the lengths and widths of common filter grille sizes to calculate the square inches of each. The total of the supply registers in the pressure zone equals 340 cfm. Sg series supply air grille drawing.
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. I think the contractor installed too small a return. Per ton is so widely accepted, the average system return is undersized by 30% or more.
The square root of 576 is 24. House is 2200q ft with 4 ton ac. 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”.
This may be common practice, but it doesn't work well at all. (in multilevel homes, a central return should be installed on each. Rg series return air grille drawing.
If only one central return air grill is installed, it shall be of proper size. There seems to be different data on the correct size duct for return sizing on a 4 ton unit. 31.75w x 15.75h] 4.4 out of 5 stars 83 $52.73 $ 52.
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