How Do You Vent High Efficiency Gas Furnaces?
High efficiency gas furnaces vent the combustion gases out of your home using plastic PVC pipe instead of galvanized sheet metal ducting. High efficiency furnaces have two heat exchangers instead of one. This allows the combustion gases to cool sufficiently so that they will not melt the plastic pipe. The plastic PVC pipe can be vented out an exterior sidewall of the home instead of the chimney. High efficiency furnaces will save you money on your heating bill and the venting is not that hard to install. Review your furnace installation manual to figure out the correct size of PVC pipe you need to use. Higher BTU furnaces will use 3-inch PVC pipe, while lower BTU furnaces will use 2-inch PVC pipe. Measure the distance from the furnace vent outlet to the exterior wall where you will be running the PVC pipe out through. Purchase the required pipe and fittings. Drill a 1/4-inch hole through the exterior wall at the appropriate height. Your pipe needs to pitch up at a minimum of 1/4-inch p
