Can You Vent A Gas Furnace Through A Wall

Gas furnaces usually come with their own specifications.

Can you vent a gas furnace through a wall. I have not heard of high efficieny only lasting 10 13 years. So what does this mean. An 80 efficient furnace can be side wall vented per national fuel as code 7 3 4 with the use of a mechanical draft system of either forced or induced draft design. The answer is yes and no.

You cannot just take the vent off an 80 efficient furnace and run it out a side wall. I would be very leary of a hvac contractor would not do this. Only units designed for it can have a vent go thru the wall and end there without a vertical stack. Distances pertaining to the furnace combustion air intake and exhaust vent distances from the indoor furnace cabinet itself and nearby surfaces materials or combustibles.

The diameter of the vent pipe should always be larger than that of the gas furnace flue ensuring that no gas escapes from the pipe. When installing a direct vent wall furnace there will be two sets of clearance distances that must be respected. Proper sidewall venting requires installing separate vent pipes horizontally so that they vent to the outdoors through a wall of your home. The exhaust gas is too cool for it to rise.

These ventilation pipes should be isolated from the furnace combustion chamber and made airtight to eliminate the possibility of combustion gas leakage. I think don t it is possible to vent a 95 efficiency furnace up through an existing chimney. Adhere to them even if you are building the vent on your own.