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Posted by Harold Kestenholz - Hydronic Network on April 19th, 2001 09:13 PM
In reply to Fire stop by Henry in MI on April 19th, 2001 07:40 PM [Go to top of thread]

Many inspectors prefer a square of sheetmetal with a hole in the middle to permit the vent to pass tightly through so air and fire can not pass from floor to floor. Fiberglass alone permits passage.

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