Posted by State of Jefferson on November 22, 2010 at 07:22:14 from (63.170.86.177):
In Reply to: Shop heat question posted by ks willie on November 22, 2010 at 06:55:12:
You never want to restrict return air if the furnace has a 18x20 plenum, you want the duct to be at least that size. Depending on the kindof work you do in the shop, I THINK you are required to use outside air for the return, to avoid running excess dust and or fumes through the furnace, that could cause fire or explosion.
If it were me, I would set it up so I could pull return air from either the shop, or the lean to. That way, if it's 20 degrees outside, and you are just puttering in the shop, you can use the already warmed shop air. But if you are painting, welding, sanding, etc you could switch it and draw clean outside air through the furnace.
That's just how I'd do it. Building codes may tell you differently. I try not to pay to much attention to codes;-}
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