tuckermtn
02-03-2012, 08:47 AM
Need some HVAC help. I am working on an 802maple designed high efficency arch. Need to get the air from the high pressure blower (square outlet from the blower-think its 4inch) to the distribution box in the arch. Seen it done with rectangular duct work like 3 x 12 ducting. But to me it seems easier to do it with 6 or 7 inch round pipe. Is there any reason to do one over the other? Thanks