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Its a burner make-up air. The furnace room is 300sqft. total living space is 2500, 1250 up and down. I think its 80,000 btu The hot water tank power vents out the wall (pvc), but does not bring in fresh air. The furnace power vents up a sealed chimney (metal 4" pipe and fan), and does not bring...

the furnace is located in the basement. which is used as living space as well. The 4" line travels stright up along the floor joists approx 8' then straight outside through the wall. It ends up a little over 3' off the outside grade. Oustide There is a hood with a screen, so wind can't...

I have a mid nat gas forced air furnace and gas hot water tank. The hot water tank directly exhausts outside, while the furnace has a fan to push the exhaust up a chimney (no draft hood) i also have a natural gas fireplace that has b-vent. I have been fighing trying to keep my utility room...