- 20
- Mar
commercial steel door with window,BS commercial metal security doors,commercial steel frame entry doors
The fire resistance time of Grade A steel fire door shall not be less than 1.5 hours, and the thickness of Grade A fire door is generally 50 mm. Pearlite is generally used inside, and a small amount of refractory materials such as vermiculite fire-proof board, foam door core board, etc.
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