China Steel Fire Rated Door Suppliers | High-Performance Factory-Made Fire Doors for Enhanced Safety
Product Features
Fire Resistance Performance
The door leaf is filled with our self-developed fire-resistant core material, while an intumescent fire-sealing strip between the door frame and the leaf expands under high temperatures to block flame penetration. This structure ensures the steel fire-rated door maintains its thermal insulation performance and meets fire resistance requirements across all rating levels.
Smoke Sealing
The door gap is precisely controlled within 1–3 mm and paired with a door closer to ensure the door remains closed. The fire-sealing strip stays flexible at normal temperatures and expands under heat to tightly seal gaps, effectively preventing the spread of toxic smoke.
Durability & Strength
The door frame and leaf are made of premium galvanized steel with excellent corrosion resistance. The welded or interlocking frame structure provides high impact resistance, ensuring long-term durability in daily use.
Aesthetic Appearance
Available in electrostatic powder coating (colors selectable from the RAL chart) and wood grain transfer finishes (simulating oak, walnut, etc.), the surface coating is smooth and free from pinholes or bubbles, allowing the steel fire-rated doors to complement various architectural styles.
Installation & Maintenance
The frame is fixed with expansion bolts, and the gap between the frame and wall is filled with cement mortar for stability. Routine maintenance is simple—regularly check the hardware for flexibility, clean the sealing strips, and replace any damaged components individually—ensuring a longer service life for the steel fire-rated door.
Fire Rating
Grade C
Fire integrity ≥ 30 minutes, fire insulation ≥ 30 minutes; Suitable for secondary fire protection areas such as pipe shafts and cable shafts, mainly used to block the spread of small fires.
Grade B
Fire integrity ≥ 60 minutes, fire insulation ≥ 60 minutes; Suitable for areas with moderate fire protection requirements such as stairwells, antechambers, and evacuation routes.
Grade A
Fire integrity ≥ 90 minutes, fire insulation ≥ 90 minutes; Suitable for important areas such as fire control rooms, power distribution rooms, rooms with valuable equipment, and fan rooms.
Others
Fire integrity ≥ 120-180 minutes, fire insulation ≥ 120-180 minutes; Suitable for areas with ultra-Class A fire protection requirements such as chemical workshops, tunnel escape exits, and arms and ammunition depots.
Application Areas
Industrial Facilities
Public Institutions (Hospitals / Schools)
Commercial Buildings (Offices / Hotels / Residences)
Transportation Hubs (Airports / Rail Stations)
Military & Security Facilities
Frequently Asked Questions
What materials provide the fire resistance in these doors?
The door leaf is filled with a self-developed fire-resistant core material, and an intumescent fire-sealing strip is installed between the frame and leaf. Under high temperatures, this strip expands to block flame penetration and maintain thermal insulation.
How do steel fire-rated doors prevent toxic smoke leakage?
The door gap is precisely controlled to 1–3 mm and paired with a door closer. The integrated fire-sealing strip remains flexible at normal temperatures and expands under heat to seal all gaps, preventing smoke from spreading.
What are the differences between Grade A, B, and C fire ratings?
Grade A offers fire integrity & insulation ≥ 90 minutes (for control/power rooms); Grade B offers ≥ 60 minutes (for stairwells and evacuation routes); Grade C offers ≥ 30 minutes (for pipe and cable shafts).
Can the doors be customized to match specific architectural designs?
Yes, the doors are available in electrostatic powder coating with colors selectable from the RAL chart, as well as wood grain transfer finishes simulating oak, walnut, and other wood types.
What is required for the installation and maintenance of these doors?
The frame is secured with expansion bolts and filled with cement mortar. Maintenance involves regularly checking the hardware flexibility, cleaning the sealing strips, and replacing individual damaged components as needed.
Are there fire ratings higher than Grade A available?
Yes, we offer custom fire doors with fire integrity and insulation ratings of 120–180 minutes. These are suitable for ultra-Class A protection areas like chemical workshops, tunnel escapes, and military facilities.