The CO detector is a real life-saver. Mine, like habu's, gives off lots of CO until the forge gets good and hot. My forge is in a 2-car garage, and I replaced the doors with swing-outs, complete with opening windows. With the doors and windows closed, it'll get to over 250ppm in about 15 minutes. So I've got a Wally-mart variety pedestal fan blowing out one window and the window on the opposite side open. The CO detector stays at 0 when I do that. After a while, I can shut off the fan.
But this forge is nothing compared to my lawn tractor. I had it in the shop to check something out and the CO went to 500ppm in about a minute.
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--Marc
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