Fire Resistance Performance:
- Class A Fire Door: Must remain securely closed for at least 1.5 hours, effectively preventing fire spread over extended periods.
- Class B Fire Door: Should maintain closure for no less than 1 hour, providing critical time for evacuation and firefighting.
- Class C Fire Door: Required to stay closed for a minimum of 0.5 hours, playing a key role in the early stages of a fire.
Flame-Retardant Properties:
Materials used for the door frame, leaf, and accessories must exhibit excellent flame resistance, minimizing combustion and fire spread to reduce risks at the source.
Sealing Performance:
UL-certified fire doors must maintain effective sealing during normal operation, preventing smoke leakage—a crucial factor in limiting fire spread through toxic fumes.
Structural Stability:
Even under impact, compression, or collision, the door must retain its fire-resistant integrity, ensuring reliable performance in complex fire scenarios.
Service Life:
Under normal conditions, UL-certified fire doors should have a minimum lifespan of 30 years, offering durable, long-term protection for building safety.
