Cat 4 furnace with schedule 40 running through to the outside.
Is this OK in light of what I found below?
R309.1.1 Duct penetration. Ducts in the garage and ducts penetrating the walls or ceilings separating the dwelling from the garage shall be constructed of a minimum No.26 gage sheet steel or other approved material and shall have no openings into the garage.
Also have a vent from the furnace on the other side to the garage but it has a automatic Honeywell damper control,so is that OK?