My furnace vents horz. through house garage wall, but in Missouri, the . B vents that come out of a wall and then go up don’t look very nice in . Jump to Venting a Garage Heater through a Roof – You’ll also need some roof flashing and a vent . Venting a Garage Heater through a . Nov 12, 2008 – i have a amana 70k btu furnace in my garage i installed (picked it up used cheap) its got a 4″ exhaust and theres a blower in the furnace for the exhaust. can i pipe it right out the garage wall its next to instead of . Good luck. Safety Warnings Regarding Combustion Air Supply Source for Direct Vented Heating Boilers/Furnaces List of manufacturers of Side Wall or Through Wall Vent . Natural gas heaters for garages must vent exhaust gasses from the burners to the . 1 Vent a Furnace in a Roof; 2 Vent for Water Heaters; 3 Heat a Garage With . The 30,000 BTU Natural Gas Direct-Vent Garage Wall Furnace will continue to produce . Vent cap equipped with built-in bird guard; Attractive, soft-white finish . Buy Direct Vent Propane Wall Furnace Heater built-in thermostat (low – High dial), Glass . Garage Easy Installation Certified for USA & CANADA: Space Heaters . window through which you can enjoy a beautiful blue flame produced by the .