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Keywords: Puf removal.jpg Improper firestop being removed Flammable polyurethane foam was used to seal this cable tray penetration 3 manhours per cubic foot to remove with live circuits to be replaced by firestop mortar Own 2007-08-16 Achim Hering Firestops Electrical conduit Cable trays Firestops being installed Polyurethane foam Exposed flammable plastics Concrete blocks Home-made firestops Building code violations |