- 08
- Aug
lowes 90 minute fire door,3 hr rated door,counter fire shutter
The steel fireproof door and door frame shall be filled with incombustible materials, and the melting temperature of door lock, hinge, bolt and other hardware accessories shall not be lower than 950 ℃. At present, the size of fire doors is not specified, and only the fire endurance of fire doors is required.
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