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I've been researching this issue because I have to put a heater in my 50'x50'x24' garage. It is very well insulated (foam), and being in Texas, will be used used only during the Nov-Feb months. From what I've found, and what I am most concerned about, is the moisture a vent-free system puts into the air. It seems the moisture can wreak havoc on tools that will collect condensation and result in accelerated rusting of tools and equipment. So I am leaning toward a vented system. Anyone have this experience with rusting tools?
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