Fire resistance rating of steel fireproof rolling shutter door
The fire resistance rating of steel fireproof rolling shutter doors is mainly divided into three grades, namely, ordinary steel fireproof rolling shutter (fire resistance time ≥2 hours), composite steel fireproof rolling shutter (fire resistance time ≥3 hours), and certain steel products that may be classified as special grade fireproof rolling shutter (fire resistance time ≥4 hours) .
Specifically:
Youdaoplaceholder0 ordinary steel fireproof rolling shutter : This type of fireproof rolling shutter door has a fire resistance time of no less than 2 hours and is suitable for building parts with certain requirements for fire resistance performance .
Youdaoplaceholder0 composite steel fireproof rolling shutter : The fire resistance time of the composite steel fireproof rolling shutter is no less than 3 hours. Compared with the ordinary type, it has a higher fire resistance performance and is suitable for places with high fire protection requirements .
The steel in the special-grade fireproof rolling shutter has a sturdy structure and excellent heat insulation performance .
It should be noted that the fire resistance rating and fire resistance time of fireproof rolling shutter doors are tested and determined in accordance with relevant national standards and regulations. The specific values may vary due to differences in product design and manufacturing processes.