Furnace Vent Detail For Attic

Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl.

Furnace vent detail for attic.

Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. Also known as the type b this vent is operating on the natural air convection. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.

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. If your furnace has an afue rating of 90 or lower it probably exhausts the gases though the flue pipe on your roof. Box or dome vents these static vents are installed directly into holes cut into the attic roof. High efficiency furnaces take advantage of the heat in the combustion gases that are wasted in natural ventilation systems.

The cmf2 is a versatile and reliable product such as space heating garages hunting camps or single story residential structures. 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. Well mainly it s a way to save space.

So why put an hvac system up in the attic at all. Fresh combustion air for the furnace is coming from the soffit vents from both roofs. Ridge vents these vents are installed at the top of a sloped roof and are commonly used on shingled homes. 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. When the vent is withdrawing air from the house it expels the gas outside through the vent. You might not receive the same air movement benefits if the unit is in a garage either. 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.

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. Gable vents these vents are designed to be visible and act as architectural touches.