Furnace Vent Detail For Attic

Box or dome vents these static vents are installed directly into holes cut into the attic roof.

Furnace vent detail for attic. Attic hvac systems save space. Mobile home 75 000 btu oil hot air down flow furnace the cmf2 series furnace is a classic and the cmf2 series furnace is a classic and time honored design. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts. Well mainly it s a way to save space.

If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof. The new model cmf2 furnace. 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 might not receive the same air movement benefits if the unit is in a garage either.

However the furnace is in an attic space which has no venting for warm humid air from house from soffits from hot roof etc to escape. A furnace in the attic is a design that works for all homes. The furnace has a stack which penetrates the flat roof and is about 3 4 above the roof plane. Also known as the type b this vent is operating on the natural air convection.

When the vent is withdrawing air from the house it expels the gas outside through the vent. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. So why put an hvac system up in the attic at all.

The cmf2 is a versatile and reliable product such as space heating garages hunting camps or single story residential structures. High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. Fresh combustion air for the furnace is coming from the soffit vents from both roofs.

Gable vents these vents are designed to be visible and act as architectural touches. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.