A fire-resistant door or a fire-rated door is designed specifically to slow down and reduce the spread of smoke or fire for allowing safe egress in the event of a fire. Fire doors are usually made up of a combination of glass, steel, timber, gypsum, and aluminum.
These doors offer a fire-resistance rating starting from 30 minutes to 3 hours, providing ample time to escape from the affected area.
Fire doors are a legal requirement for certain buildings, including commercial properties and flats, with the sole purpose of halting the destruction caused due to fire. These doors are tested from both sides to determine the stability and integrity of the door during ablaze.
The most authentic way to identify a fire door is to check its certification label. All fire doors are required to have a certification label as it acts as proof of whether the doors are tested enough to determine their fire resistance level. These labels are usually found on the top edge of the door leaf. The validation of a certified fire door is to be done by ul intertek（wh）and fm.
This label also states the fire-resistance rating of the door. For instance, FD30 means 30-minutes fire resistance; FD60 means 60-minutes fire resistance, etc. Not just the door, even the door frame is required to have a label marking on it. Though this is not mandatory, it is still highly recommended.
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