Furnace Venting Into Attic

The roof is a t shaped gable roof.

Furnace venting into attic.

This means that 10 percent or less of the possible energy found in the natural gas that can be used for heat is lost during the combustion process due to venting. If any gaps remain and the vent isn t airtight the toxic gases will leak back into your home. Also known as the type b this vent is operating on the natural air convection. This undermines the entire purpose of venting the furnace in the first place.

Joe downs december 31 2017 at 1 47 pm. The top of the t has soffit vents and a ridge vent. The drain must be installed through the core of the house as water will be flowing during the colder months. A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace.

The furnace is located in the stem. This drain removes the excess water that a heating system will generate. Recently moved into home in eastern ma zone 5 and have a 2 story 3k sqft home. There are 3 gas furnaces and ac units.

12 07 2009 11 36 am 21. Taking care of the vent on your gas furnace is extremely important but working improperly and damaging your vent can have catastrophic results. The stem of the t has soffit vents and no vent at the top. You might not receive the same air movement benefits if the unit is in a garage either.

As far as terminating a combustion air vent into an attic i hope every one can understand what can happen in that case it is totally opposite of installing a combustion supply air vent. It has started to leak water back through the exhaust fan into the bathroom. When the vent is withdrawing air from the house it expels the gas outside through the vent. See comment 3 above.

The trick to the installation of a gas furnace in an attic space is routing the condensate drain from the attic down through the core of the house to the basement. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. One of the furnaces is in the attic. The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber.

If you don t have a crawl space or a basement then it can be a challenge to place a furnace on the ground floor of the structure. You may have a bad boot around the roof vent that is leaking into the attic. Original installers used pvc to vent the furnace to the roof but combustion air for the furnace is pulled from inside the house. I have a bathroom exhaust fan that is vented directly into the attic.