Furnace Venting Into Attic

Yes in fact this is the most efficient manner of providing air to your furnace.

Furnace venting into attic.

Unless you have a slab where the equipment would likely be in the garage venting can go directly through the roof instead of routing through an exterior wall making it much easier to install the duct work along the upper floor. You ll start to save money on your heating costs too and your furnace will perform closer to its indicated seer. Cut enough aluminum flashing from the roll to wrap around the vent pipe with an extra 6 inches to spare. Insulation is only so effective in preventing the heat in the house from going up into the attic.

Unwrap the flashing from the vent pipe so you can work with it. Fresh combustion air for the furnace is coming from the soffit vents from both roofs. If you re preparing to upgrade an old furnace it might be time to consider moving it back down to the ground level. You ll see the concentric pipe used.

Bend these newly cut tabs in. That is because with an attic installation vents must go down into the thermal envelope to deliver warm air. Cut 1 inch deep slots a few inches apart along the top side. In this video my hvac contractor gilbert rosipal from airrite shows us the inner workings of a 95 efficient gas furnace.

Attic air is already partly heated from heat in the upper level of your home radiating into the attic despite insulation. The furnace has a stack which penetrates the flat roof and is about 3 4 above the roof plane.