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Old 02-05-2013, 19:46   #2
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Join Date: Aug 2004
Posts: 13,602
We played with them, but the more affordable ones require a large temperature differential to work well [a human against a 50* F background or a 98* F human against a 1200* F house fire.

In the summers here, it isn't quite as effective as one would hope for.
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