I'd say purty hot. About as hot as the air temp inside of it. I'd think if you kept a clearance gap you'll be OK. Even a fireplace flu only requires inches of space for code. Also, I doubt the drum's ever going to get so hot that the lumber will combust.
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[COLOR="Blue"][B]"Oh, I don’t reject Christ. I love Christ. It’s just that so many of you Christians are so unlike Christ."
-Mahatma Gandhi[/B][/COLOR]
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