FIRE EXIT DOOR
A fire door is a door with a fire-resistance rating (sometimes referred to as a fire protection rating for closures) used as part of a passive fire protection system to reduce the spread of fire or smoke between compartments and to enable safe egress from a building or structure.
Steel Sheet Gauge: 1.5mm to 0.8mm
Door Leaf: 70mm
Glass for fire-proof doors: 25mm
Material for Inner Core: Perlite board
Both the door leaf (the swinging panel of the door) and the door frame are required to meet the guidelines of the testing agency which provides the product listing. The door frame includes the fire or smoke seals, door hardware, and the structure that holds the fire door assembly in place. Together, these components form an assembly, typically called a "doorset" which holds a numerical rating, quantified in hours of resistance to a test fire. All of the components of the fire door assembly must bear a listing agencies label (with the exception of ball bearing hinges which meet the basic build requirements of ANSI 156.2 and NFPA 80) to ensure the components have been tested to meet the fire rating requirements.
WHAT IS PERLITE?
Perlite is a naturally occurring siliceous rock that expands 4 to 20 times its original size when rapidly heated to approximately 3,000 °F. In reality, expanded Perlite is a "popped rock" that is inert, lightweight, sterile, permanent, incombustible, asbestos-free, non-toxic, rot and vermin proof and has a neutral pH. OSHA classifies it as a nuisance dust.
Fire doors are not necessarily noncombustible. It is acceptable for portions of the door to be destroyed by combustion during exposure to a fire as long as the door assembly meets the fire test criteria of limiting temperature limits on the non-fire side of the assembly. This is in accordance with the overall performance goal of a fire rated door to slow fire propagation from one fire rated compartment to another for only a limited amount of time, during which automatic or manual fire fighting may be employed to limit fire spread, or occupants can exit the building.