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10-10-2012, 07:06 PM #1
Horizontal Furnace - How long for supply air plenum?
I was looking at the possibility of mounting a high efficiency furnace horizontally in a garage as opposed to a unit heater at a customers request. I've heard guys talk about a minimum length for the supply air plenum but do not see anything in the manual for the unit I was considering.
Is there a standard minimum and what are the reasons?