While I am not saying I've never done it, I wouldn't recommend brewing in the garage with the door closed or just cracked open. In addition to the CO you mentioned, you have an oxygen problem. If your fire eats up all the oxygen you are a dead duck, even if there is no CO.
I still brew in my garage in the winter to keep the snow out, and to get out of the wind, but I keep the door open and a wear heavy coat on to keep me warm.
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Patrick
Tap 1: Open
Tap 2: Pilsner w/Saaz
Tap 3: Vienna w/Koelsch
Primary: Double Tap Ale (Inspired by Bell's Two Hearted)
Lagering: Pilsner with Hallertau
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