Renqiu Zhongsheng Metal Products Co., Ltd. is one of the most professional manufacturers and suppliers of steel closed fire-resistant door in China. Please feel free to wholesale durable steel closed fire-resistant door made in China here from our factory. All customized products are with high quality and low price. Contact us for pricelist.
Suitable for fire protection installations in various overseas buildings, industrial plants, and commercial buildings, this Steel Closed Fire-Resistant Door boasts exceptional practicality. With no unnecessary decorative premiums, all costs are invested in the materials, filling, and fire-resistant hardware. The high-quality materials ensure zero inspection issues, making it a top-selling option for fire protection zones.
The entire door is made from national standard thickened cold-rolled carbon steel sheet, with the door panel and frame uniformly thickened and reinforced, rejecting the industry's practice of using thin sheet metal. The entire steel sheet is bent and cut in one piece, with seamless joints, no spot welds, and no panel imperfections, resulting in a highly robust, one-piece structure. The entire door panel is extremely resistant to impact and compression; everyday bumps and knocks from carts and frequent personnel will not cause dents, frame bending, or corner cracks.
The internal fireproof filling strictly adheres to international fire safety standards. The Steel Closed Fire-Resistant Door is filled with high-density compacted flame-retardant rock wool, with a single, seamless filling layer free of hollows, voids, or gaps at the edges.
The rock wool adheres tightly to the inner wall of the door, preventing sinking, shifting, or clumping even after long-term use. Its fire-resistant and heat-insulating performance is stable; it does not conduct heat rapidly or release harmful fumes under high temperatures.
As a dedicated fire door with a closed design, this product comes standard with a complete set of original fire-resistant hardware, pre-installed at the factory without the need for additional installation. It features a high-temperature resistant fireproof door closer, reinforced fireproof hinges, and a complete set of dedicated fire-resistant locks.
All hardware is fireproof and rustproofed, ensuring it will not melt, break, or fail under high-temperature open flame conditions. It has a built-in uniform-speed closing and rebound mechanism, automatically and uniformly closing and locking after opening, ensuring a tight and secure seal without issues such as door gaps lifting, jamming, or incomplete rebound, meeting stringent fire safety inspection standards.
With targeted optimization of sealing and surface processes, the Steel Closed Fire-Resistant Door features an integrated flame-retardant expansion sealing strip embedded in the door frame. Upon exposure to high temperatures and fire, this strip automatically expands to seal the door gaps, completely preventing the leakage of dense smoke and toxic fumes. The door panel surface utilizes an electrostatic anti-corrosion powder coating process, ensuring strong paint adhesion and resistance to moisture, indoor moisture, and dust corrosion. Even when installed in damp areas such as basements, equipment rooms, and corridors, this normally closed steel fire door will not rust, peel, or powder, requiring no regular repainting maintenance.
The minimalist and well-proportioned design aligns with the aesthetics of overseas industrial architecture. The product offers two basic models: single-leaf and double-leaf, with a full range of standard door opening sizes to fit most building fire door openings. The door frame features an internal reinforcing rib structure, preventing deformation under stress and maintaining a tight seal even after tens of thousands of openings and closings. The door panel has a smooth and clean surface without unnecessary carvings, making it suitable for fire protection installations in factories, office buildings, warehouses, and underground machine rooms. It also supports custom-made door opening sizes and frame widths to accommodate irregularly shaped building openings.
The entire Steel Closed Fire-Resistant Door system is fully certified, with smooth acceptance testing, requires no subsequent maintenance, and offers strong stability for bulk project supply. If you have needs for pattern selection, size customization, bulk procurement, or certification verification, please feel free to contact us privately. We will provide a suitable solution tailored to your project requirements and offer a one-stop supply service.
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