240 minute / 4 hour fire rated door hardware

Fire rated doors are required in numerous areas of a commercial buildings. Metal fire doors can attain ratings up to 3 hours where wood fire doors can be rated up minutes. Not all doors in a commercial building need to be fire rated. Fire rated door requirements are typically determined by the fire rating of the wall and use of the door.

A 3 hour door(180 min.) is typically required in 4 hour rated walls that separate buildings or divide a building into separate fire rated areas.

90 Minute doors(1-1/2hr.)are requiresd in 2 hour rated wall openings to  stairwells, elevator rooms or egress through a building. 90 minute doors are also used in  exterior openings where there is a potential for severe fire exposure from outside.

1 hour, or 60 minute assemblies are required on 1 hour rated walls that divide occupancies in a building.

45 minute, or 3/4 hour fire rated doors are installed in 1 hour walls that act as room partitions or divide corridors. 45 minute doors are also used in exterior door openings where there is a possibility of light to moderate fire exposure from outside.

20 minute fire rated, or 1/3 hour doors are used in 1 hour rated walls to separate corridors where smoke and draft control are required. In residential applications most doors separating the garage from the living quarters require a 20 minute label.

A door assembly must comply with proper door hardware requirements to be approved as a rated assembly. Door hardware must be fire listed and comply with The National Fire Protection Association's NFPA80"Stadard for Fire Rated and Fire Windows."

Hinges: A fire rated door must be hung on ball bearing type hinges made from steel or another non-ferrous metal. Doors up to 4'0'' wide  and 8'0'' tall can use standard weight (134 thickness) ball bearing hinges. Doors over 4'0'' wide and 8'0'' tall must be use heavy weight hinges.(180 thickness)

Locks: When using a deadbolt in a fire rated exit that is a means of egress the deadbolt must be an interconnected type or a function of a mortise lock where the deadbolt can be retracted automatically when the latch bolt is disengaged.

Closers: Fire rated doors must be self-closing. Either a listed spring hinge or closer is required at all fire rated openings.

D&D Hardware Manufacture of high quality hardware for Fire Rated Doors, Wooden Doors, Metal Doors, Escape Doors, Single Fire Rated Flush Doors, Double Doors, Security Doors, Louver Steel Doors etc.

Our products which include Panic Exit Device, Lever Handles, Mortise Locks, Lock Cylinder, Door Hinges, Door Closer, Door Bolts, Door Stoppers, etc.

All our products strictly according to international Standard, such as the ANSI, BS EN/CE, UL, BHMA standard.

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