how far from an a/c supply duct must the return be in a room serviced by both supply and return.
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Replies
As far as possible.
There are no code issues that I'm aware of for supply and return proximity to each other. Just common sense.
I assume your referring to a great room or living room. No return air in the kitchen(and a few other common sense places). Return air duct needs to be a min. of 10' away from a fireplace or any other vented appliance.
For AC, it should not be on the floor.
I once heard a presentation by a mechanical specialist who said the location of the return makes little difference.
He held up a match about 1 foot from his face and blew it out. He lit another match about 1 foot from his face and then started sucking.
he said "no matter how hard I suck, I can not suck that flame out"