No, sorry, you can't use the AC vent.
Replacement air has to come from outside, at least 10 feet from the exhaust duct.
A window is usually good enough, as long as you try to get at least roughly 50 square inches of opening (equates to an 8" round duct).
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Chaotic Glass: Safety for the glassworker, and random thoughts and opinions on the state of the glassworking world
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