Aye, one of our safety gurus said you need at least ten feet separation of the exhaust outside from where your make up air is drawing from.
Oh, and make sure you are not pulling fumes from the furnace or gas water heated back down the chimney as well.
They only get drawn "up" the chimney by the heat of the fumes so it doesn't take much at all to draw the fumes back down and into your house.
Do a "smoke test" near the furnace, water heater and even gas dryer if you have one to make sure.
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The Zombie Apocalypse is Upon Us.
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