1949 N.B.F.U. MANUAL No.91 - BLOWER & EXHAUST SYSTEMS - DUST, STOCK & VAPOR For Sale
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STANDARDS BOOKLET No. 49NATIONAL BOARD OF FIRE UNDERWRITERS STANDARDS FORINSTALLATION BLOWER AND EXHAUST SYSTEMSFOR DUST, STOCK AND VAPORREMOVAL OR CONVEYING RECOMMENDED BY THENATIONAL FIRE PROTECTION ASSOCIATION PREPARED BYTHE COMMITTEE ONBLOWER SYSTEMS 23 PAGE BOOKLET IN VERY GOOD CONDITION
