[QUOTE=faithfulfrank;364742]I would not suggest having a supply duct in your garage......if that register was open and the air handler was not running it could cause Carbon Monoxide to enter your living space from car, golf cart or lawn mower exhaust.
You do make a valid point, and I guess the individual would need to make the decision. Since most of us open our garage door when we run our cars, golf carts, and lawn mowers, the chance of any CO poisoning would be minute on a supply side of an air handler unit. ABSOLUTELY never put a return air grill in the garage for the reason you mentioned. I put a supply in my garage 10 years ago with CO detectors throughout my home, and have never detected any CO. Again, it works well for me, but if others don't feel comfortable with this, don't do it.
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