Lingyufab is based in Shanghai, where a mature industrial supply chain and an experienced workforce allow us to produce fire rated metal doors at competitive prices. We follow the ISO 9001:2015 quality management system, and because production stays in-house, customers avoid the markup that comes with outsourcing—typically saving 15 to 20 percent. We handle order sizes from a single sample to 100-piece pilot runs to ongoing mass production, with current monthly output exceeding 5,000 units.

Fire rated metal doors are safety-critical components, so specifications are driven by fire resistance, structural integrity, and code compliance.

Every building project has its own opening sizes, fire ratings, and hardware requirements, so Lingyufab treats each fire rated metal door as a custom project rather than a catalog item. We produce:

We also handle custom sizes, hardware preparations, and finish colors based on your drawings or samples. Our engineering team can assist with design optimization and code compliance, and reverse engineering is available if only a physical sample exists. Prototyping starts at zero MOQ.

A fire rated metal door may look like a simple steel panel, but producing one consistently involves several sheet metal processes working in sequence. Laser cutting shapes the flat blanks, CNC bending forms the door leaf and frame profiles, stamping creates hinge and lock mounting features, welding joins multi-piece assemblies and reinforcement plates, and surface treatment prepares the door for its working environment. At Lingyufab, all of these steps happen under one roof rather than being handed off between vendors, which keeps tolerances tight and lead times predictable. Because fasteners are also made in-house, hinge reinforcement plates and lock mounting hardware can be pre-installed before the doors ship, reducing assembly work at the customer's end.

A fire rated metal door is a specialized door assembly engineered to resist the spread of fire and smoke between compartments of a building. It is not just a steel panel—it is a complete system that includes the door leaf, frame, hinges, locks, closers, and intumescent seals, all designed to work together as a tested assembly to contain fire for a specified period. Fire rated metal doors are typically constructed from galvanized steel, stainless steel, or carbon steel, with internal cores of rock wool, honeycomb, or composite fire-resistant materials. The door leaf and frame are reinforced at critical points to maintain structural integrity under fire conditions. They are used in stairwells, corridors, equipment rooms, and other locations where building codes require a fire separation to protect occupants and property.

Lingyufab supports 1-piece prototyping, 100-piece pilot runs, and high-volume mass production with monthly delivery exceeding 5,000 units.

Producing a fire rated metal door that performs correctly and installs efficiently comes down to a few practical points:

Door leaf thickness typically ranges from 0.8mm to 2.0mm, with internal cores of rock wool, honeycomb, or composite fire-resistant materials. The core material and thickness are selected based on the required fire rating and structural performance.

A fire rated metal door that does not fit properly can compromise the fire seal and allow smoke to pass, so dimensional accuracy matters throughout production.

These standards are maintained through laser cutting, CNC bending, stamping, and welding equipment, along with in-process inspection and final quality checks.

Quality control covers the full production sequence:

Lingyufab produces a range of fire rated metal door and related components:

Lingyufab (Shanghai Lingyu Industrial Co., Ltd.) is a professional sheet metal fabrication and assembly manufacturer, established in 2003. Fire rated metal doors are one of the main product categories within our broader sheet metal manufacturing business.

Our Shanghai facility handles laser cutting, CNC bending, stamping, welding, and surface treatment in-house, giving us full control over dimensional accuracy and finish quality. We are ISO 9001:2015 certified and support projects ranging from a single prototype to 100-piece pilot runs to high-volume production exceeding 5,000 units per month. In-house fastener manufacturing allows us to pre-install hinge reinforcement plates and lock mounting hardware before shipment, reducing assembly work for our customers.

As a Mitsubishi Electric certified core supplier, we serve commercial, industrial, and infrastructure customers with reliable, cost-effective fire rated metal door solutions. With competitive pricing, 15-20% cost savings through in-house production, and full material traceability with MTC for every batch, Lingyufab delivers dependable fire rated metal door solutions for customers worldwide.