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. You ll start to save money on your heating costs too and your furnace will perform closer to its indicated seer. Insulation is only so effective in preventing the heat in the house from going up into the attic. The reason for this advantage is the fact that venting for your furnace requires less work in an attic than it does in other locations of your home. You ll see the concentric pipe used.
Bend these newly cut tabs in. If you re preparing to upgrade an old furnace it might be time to consider moving it back down to the ground level. Now cut 2 inch deep slots. That is because with an attic installation vents must go down into the thermal envelope to deliver warm air.
Yes in fact this is the most efficient manner of providing air to your furnace. Fresh combustion air for the furnace is coming from the soffit vents from both roofs. 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. The furnace has a stack which penetrates the flat roof and is about 3 4 above the roof plane.
Unwrap the flashing from the vent pipe so you can work with it. Cut 1 inch deep slots a few inches apart along the top side.