1. What is a Class C Fire Door?Steel Class C Fire Door : A Comprehensive Guide
Class C fire door are built to strict standards, constructed from high-quality cold-rolled steel or stainless steel for frames, door panels, and internal structures. Finished with a durable electrostatic spray coating, these doors are filled with eco-friendly, non-toxic fire-resistant insulation, meeting fire safety standards set by GB12955-2008. These fire doors provide stability, integrity, and insulation, designed to limit the spread of fire and protect occupants. As a 30-minute fire door, it can withstand flames and intense heat for critical evacuation time, making it essential in modern fire safety solutions from trusted fire door manufacturers.
2. Purpose of Class C Fire Door
A Class C fire door plays a critical role in building safety by preventing the spread of fire and smoke. These doors, installed in areas such as fire partition walls, stairway entrances, corridors, and building shafts, serve as both passageways and fire barriers. In the event of a fire, the door’s fire-sealing function activates, preventing smoke and flames from entering escape routes. While designed to meet 30-minute fire door standards, these doors also offer a smoke-blocking feature, ensuring safer evacuation and minimizing fire risks within the building.
3. Structural Features of Class C Fire Door
Class C steel fire doors incorporate a durable frame and door panel with fire-rated hardware like closers and locks. The standard door panel width for 30-minute fire doors is ≤1200mm without seams, providing seamless integrity in case of fire. Reinforced with fire-rated glass when needed, these doors ensure full transparency and heat resistance, making them ideal for emergency exits. With a minimum thickness of 400mm, Class C fire doors offer optimal fire endurance and sound insulation, which is ideal for areas where additional noise reduction is beneficial.
4. Applications for Class C Fire Door
Class C steel fire doors serve critical roles in various settings:
- Inspection Doors for pipeline and cable shafts
- Basements where combustible materials exceed 30kg/㎡, where Class A fire doors are often preferred
- Boiler Rooms, Transformer Rooms, and Generator Rooms where fire hazards are high, requiring automatic closure
- High-Rise Buildings for areas with automatic fire suppression systems, vent rooms, and air conditioning units, often using walls with a 2-hour fire rating and floors with a 1.5-hour rating, separated by Class A or Class B fire doors
These diverse applications demonstrate the versatility of fire door manufacturers in meeting different building safety standards.
5. Technical Specifications for Class C Steel Fire Doors
The required fire-resistance rating for a Class C fire door is a minimum of 0.6 hours, with a door thickness of at least 40mm. Specific material thicknesses include:
- Door panel: ≥0.8mm galvanized steel
- Door frame: ≥1.2mm galvanized steel
- Reinforcement: ≥1.2mm steel (≥3.0mm when reinforced with bolt holes)
These standards ensure that 30-minute fire doors provide not only fire protection but also structural integrity.
6. Dimensional Specifications and Quality Assurance
Class C steel fire doors adhere to strict dimensional tolerances for effective installation and operation. Permissible deviations for door height, width, and thickness are minimal, with attention to fire-rated hardware installation and material quality. Each door undergoes a rigorous inspection for uniform welds, smooth finishes, and compliance with national fire safety standards, ensuring reliability from fire door manufacturers.
7. Material and Seal Requirements
Class C steel fire doors are constructed with galvanized steel frames and fire-resistant fillings such as perlite for door panels and cement-based materials for door frames. These doors also feature seal slots lined with fire-resistant rubber to ensure an airtight fit. Our doors pass national fire safety inspections, providing essential certifications to meet building regulations and offering trusted solutions for fire-rated entry points.
8. Identifying Quality Class C Fire Door
Quality assurance for Class C steel fire doors involves assessing key attributes:
- Exterior finish and even welding
- Accurate dimensions and fit
- Appropriate fire-rated materials
- Certified fire-rated hardware and glass, if applicable
9. Guangdun Door Industry: Leading Fire Door Manufacturer
Guangdun Door Industry, with over two decades of experience in the fire safety industry, is a prominent fire door manufacturer recognized across China. In a recent milestone, Guangdun was awarded the honor of Best Building Materials Company of 2024 in Kunming City. The company played a critical role in completing fireproof renovations within three months for major projects like Fuxing Building, YiHe Hotel, and the Jindi Technology Park. This renovation project, one of the most competitive bids in Yunnan Province over the past three years, represents the province’s fastest renovation project to date, with Guangdun Door Industry as the primary supplier.
Our production line covers a comprehensive range of fire doors, including steel and wooden fire doors, fire shutter doors, and smoke curtains. Certified by GB/T19001-2000 and designed to meet rigorous fire safety standards, Guangdun’s fire doors provide unmatched quality, performance, and reliability in fire protection solutions, extending our services from China to the global market.
As a trusted Class C fire door supplier, we are committed to producing cost-effective and quality products for fire safety in various industries.
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