A quick call to your local Building Department will answer that one correctly. I'm in WA, one in England, some in Canada, etc. Yoy would a variety of answers, maybe the correct one.(I don't know) This will help in the design: http://www.buildingscience.com/docum...hterm=basement
Be safe, Gary
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17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?