Furnace Venting Into Attic

Attic air is already partly heated from heat in the upper level of your home radiating into the attic despite insulation.

Furnace venting into attic.

That is because with an attic installation vents must go down into the thermal envelope to deliver warm air. Now cut 2 inch deep slots. 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.

Cut 1 inch deep slots a few inches apart along the top side. If you re preparing to upgrade an old furnace it might be time to consider moving it back down to the ground level. Bend these newly cut tabs in. Unwrap the flashing from the vent pipe so you can work with it.

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. Yes in fact this is the most efficient manner of providing air to your furnace. In this video my hvac contractor gilbert rosipal from airrite shows us the inner workings of a 95 efficient gas furnace. You ll see the concentric pipe used.

The furnace has a stack which penetrates the flat roof and is about 3 4 above the roof plane. 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.