Duct Material Experience Has Shown That Duct Materials May Transmit Fire From One Area To Another Even When They Have Obtained Relatively Low Flame Spread

duct material experience has shown that duct materials may transmit fire from one area to another even when they have obtained relatively low flame spread

duct material experience has shown that duct materials may transmit fire from one area to another even when they have obtained relatively low flame spread.

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duct material experience has shown that duct materials may transmit fire from one area to another even when they have obtained relatively low flame spread .
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