Fire Doors provide a movable barrier used as part of a fire protection system in order to prevent the spread of fire or smoke throughout a building while permitting people to pass through a fire-resistant wall.
The requirement to inspect fire doors and maintain them in good working order isn't a new requirement at all; it has been a part of NFPA 80 recommended practices for years. The 2007 edition of NFPA 80: Standard for Fire Doors and Other Protectives, however, actually makes this mandatory and no longer merely a recommendation.
Fire Ratings by Hour & by Letter-Designation:
Class "A" (3-hour)-Openings in firewalls that divide a single building into fire areas.
Class "B" (1 hour)-Openings in enclosures of vertical shafts and stairwells through buildings and in 2 hour rated partitions providing horizontal fire separations
Class "C" (3/4 hour) - Openings in walls or partitions between rooms and corridors having a fire resistance rating of 1 hour or less.
Class "D" (1 1/2 hour) - Openings in exterior walls subject to severe fire exposure from outside the building.
Class "E" (3/4 hour) - Openings in exterior walls subject to moderate or light fire exposure from the outside of the building.
No letter designation (1/2 or 1/3 hour) - Openings in walls or partitions between rooms and corridors having a fire resistance rating of 1 hour or less. Note that these doors are not really considered fire doors, but rather used for smoke control only.
The installation and maintenance of fire doors in homes and offices is necessary to maximize safety in the event of a fire. Today, Fire Doors have been made a mandatory requirement & have established acceptance in high rise buildings and Commercial Buildings.
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