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MAINTENANCE AND TESTING OF FIRE/SMOKE DAMPERS
www.health.state.mn.usair ducts [see NFPA 90A(12), Sec. 4.3.5.5]. CAUTION: Care must be taken to ensure that any access panels or drop-in ceiling tiles used to provide this access do not reduce the fire resistance rating of your floorceiling or roofceiling - - assemblies. New installations
Fire Safety Guidance Note: Fire Resisting Separation ...
www.london-fire.gov.ukFire-resisting floors and ceilings 2.7 The fire resistance of floors will depend on the existing floor construction as well as the type of ceiling finish beneath. If the fire resistance of a floor needs upgrading it may not be desirable to apply additional fire resistance to the underside of an existing ornate ceiling. In older buildings