To allow for opening in a wall, it is possible to move one 2nd floor cold air return to another existing main floor cold air return?
Currently the 2 cold air returns sit beside each other in 2 separate 16" stud runs (one for main floor, one for second floor), can I move them into one? or is this bad practice for cold air return flow.
In total I have one big (30") cold air return, and a small (16") cold air return on the main floor, and 3 small 16" cold air returns on the 2nd floor.
The ones I am asking if I can combine is the small main floor one & one of the 3 upstairs. thanks.
You can not combine cold air returns. They are all calculated by volume eg 16x3 1/2" = 56 sqin. You can move it to another location on the wall, but it must be the same size. If you delete it you are affecting the air flow to the 2nd floor. You can't get heat to a floor unless it has a return back to the furnace.
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