Furnace Venting Into Attic

The roof is a t shaped gable roof.

Furnace venting into attic. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Joe downs december 31 2017 at 1 47 pm. The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber. 12 07 2009 11 36 am 21.

The furnace is located in the stem. The stem of the t has soffit vents and no vent at the top. Or you may have a distance issue. See comment 3 above.

This drain removes the excess water that a heating system will generate. These types of furnaces have a dedicated pipeline that runs directly from an outside vent into a sealed combustion chamber of the furnace and a sealed vent to the outside of the home. 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. 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.

The drain must be installed through the core of the house as water will be flowing during the colder months. If any gaps remain and the vent isn t airtight the toxic gases will leak back into your home. I have a bathroom exhaust fan that is vented directly into the attic. This undermines the entire purpose of venting the furnace in the first place.

One of the furnaces is in 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. 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.

Recently moved into home in eastern ma zone 5 and have a 2 story 3k sqft home. A furnace in the attic is a design that works for all homes. 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. A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace.

You may have a bad boot around the roof vent that is leaking into the attic. There are 3 gas furnaces and ac units. The top of the t has soffit vents and a ridge vent. When the vent is withdrawing air from the house it expels the gas outside through the vent.