Fire rating of fire-proof access door.

The fire rating of the fire-proof access door is usually Class C, and its fire resistance limit is not less than 0.5 hours.

‌ Characteristics of Class C Fire Door Material: steel or wood.

The steel door frame is made of galvanized steel plate with a thickness of not less than 1.2 mm, and the door leaf is made of galvanized steel plate with a thickness of 0.8 mm, and the interior is filled with environmental protection, fire prevention and heat insulation materials. ‌

Application scenario: It is mainly used for fire separation of vertical tube wells (such as cable wells and pipeline wells) in buildings to prevent the fire from spreading through the tube wells. ‌

Other fire door grades Class A fire door (fire resistance limit ≥1.5 hours): used in important areas such as firewall and fire-fighting equipment room. ‌ Class B fire door (fire resistance limit ≥1 hour): it is commonly used in crowded areas such as evacuation stairwells.