Hello I have 2 high efficiency furnaces (vents for intake and exhaust) and a power vent hot water heater. What the installer did (before I bought the house) was use the old chimney (I think a 6" pipe) as a fresh air intake, I assume for the hot water tank. I'm now looking at removing / moving the chimney / fresh air intake.
My question is what would be the minimum size for a new fresh air intake?
I assume it's going to be a hard problem as code is different in different places, but I assume the laws of physics are the same everywhere so there must be a rule of thumb minimum... I hope.
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