Furnace Vent Detail For Attic

Fresh combustion air for the furnace is coming from the soffit vents from both roofs.

Furnace vent detail for attic.

Gable vents these vents are designed to be visible and act as architectural touches. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems. In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents some high efficiency furnaces also include a plastic pipe for intake area and all types.

Well mainly it s a way to save space. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.

Attic hvac systems save space. Also known as the type b this vent is operating on the natural air convection. The cmf2 is a versatile and reliable product such as space heating garages hunting camps or single story residential structures. 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.

When the vent is withdrawing air from the house it expels the gas outside through the vent. So why put an hvac system up in the attic at all. Box or dome vents these static vents are installed directly into holes cut into the attic roof. 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.

Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts. You might not receive the same air movement benefits if the unit is in a garage either. The new model cmf2 furnace.

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. The furnace has a stack which penetrates the flat roof and is about 3 4 above the roof plane. Another problem is that flue pipes that go through the roof tend to be less efficient.