Thanks Mike! I always worried though with the hot water heater flame and furnace. We only have one window, and then I thought a fan would help push it up and out. Scary though! Although, that's one way to see if the co detectors are working. But then I've always wondered about welders and plumbing when they're in a basement, or would they shut down all the pilots, or is that even a concern? Thanks again Mike. Barb H.
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