High efficiency furnace size to use 2inch vent and intake
I am designing the layout of the basement in a 60 year old home, theres not alot of room there (5' 9" from the support beam to the floor), for this reason its taking me days of work to arrange ducting and venting pipes for everything in the 3D CAD software.
I notice in 1000-1200 sq ft houses the high efficiency furnace are venting with 636 2inch pipe (same as in take), this is 1000 sq Ft, however thought i would ask the experts instead of assumnig this is ok, what size high efficiency furnace will need 3 inch 636 vent duct (to make sure 1000 sq ft will use a small enough furnace to require 2inch only)?
Theres only room for 2inch in this place which i think will be fine, but always best to check on these things.
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