Garage question

[Bob Elliott]

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?

[Christopher Currins]

Schedule 40 is not a "duct". As long the opening is properly sealed it should be OK.


Building standards require that all ducts in the garage and ducts penetrating the firewall be equipped with fire-dampers or constructed of a minimum of No. 26 gauge sheet steel or other approved material and shall have no openings in the garage. This condition compromises the garage firewall system.

[Bob Elliott]

Originally Posted by ccurrins

Schedule 40 is not a "duct". As long the opening is properly sealed it should be OK.


Building standards require that all ducts in the garage and ducts penetrating the firewall be equipped with fire-dampers or constructed of a minimum of No. 26 gauge sheet steel or other approved material and shall have no openings in the garage. This condition compromises the garage firewall system.

So the damper makes it OK to have a heat vent from the furnace closet or not.