Furnace Vent Detail For Attic

Well mainly it s a way to save space.

Furnace vent detail for attic.

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. 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. If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof. 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.

The new model cmf2 furnace. Ridge vents these vents are installed at the top of a sloped roof and are commonly used on shingled homes. Fresh combustion air for the furnace is coming from the soffit vents from both roofs. So why put an hvac system up in the attic at all.

High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems. 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. Gable vents these vents are designed to be visible and act as architectural touches.

You might not receive the same air movement benefits if the unit is in a garage either. A furnace in the attic is a design that works for all homes. 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.

Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. The cmf2 is a versatile and reliable product such as space heating garages hunting camps or single story residential structures. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it.

An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. Attic hvac systems save space.