As a professional steel fire door manufacturer, YK Door Industry Co., Ltd. ensures that all custom steel fireproof doors supplied for industrial applications adhere to strict national and project-specific technical standards. The following outlines the key specifications required for compliance and performance in demanding environments.

Compliance with National Building and Fire Safety Standards

All metal fire doors provided in this project must comply with the following authoritative Chinese standards:

GB 191 – Packaging, Storage, and Transportation Symbols
GB 5464 – Test Methods for Non-Combustibility of Building Materials
GB 5823 – Building Doors and Windows Terminology
GB 5824 – Size Series for Door and Window Openings
GB 5825 – Symbols for Opening Direction and Surface
GB 6388 – Transportation Packaging Marks
GB 7633 – Fire Resistance Test Methods for Doors and Shutters
GB 13685 – Wind Pressure Resistance for External Doors
GB 13686, GBJ 16, GBJ 45, and GBJ 210 – Building Design and Fire Safety Specifications
TJ 9 – Structural Load Requirements for Industrial and Civil Buildings

These standards ensure that our stainless steel fire doors and other fire-rated commercial doors meet the required durability, fire resistance, and installation specifications for modern industrial environments.

I. Fire Resistance and Material Specifications-Custom steel fireproof door

To guarantee life safety and asset protection, our steel fire resistance doors must meet the following criteria:

Grade A doors: Minimum fire resistance of 1.2 hours
Grade B doors: Minimum fire resistance of 0.9 hours

II. Door Leaf Opening Direction

Opening direction directly affects emergency egress efficiency. Therefore:

Right-opening doors turn clockwise
Left-opening doors turn counterclockwise
All fire-rated doors must open toward the evacuation path

This standard applies to both single leaf and double-leaf commercial fire doors, ensuring compliance with fire safety exit protocols.

III. Technical Material and Hardware Requirements

To maintain structural integrity under extreme heat and load conditions, YK’s Custom steel fireproof door must include:

Steel Components:
- Door frames made from 1.5mm cold-rolled steel plates
- Door leaf panels: 1.2mm cold-rolled steel
- Reinforcements: preferably 1.5mm or thicker; with screw holes, not less than 3.0mm
Non-Combustible Core:
- Door leaf and frame filled with fireproof material
High-Temperature-Resistant Hardware:
- Locks, hinges, bolts must resist temperatures of at least 950°C
Installation Hardware Standards:
- Bi-directional spring hinges are not permitted
- Single-leaf fireproof steel doors must include door closers
- Double-leaf units require astragals, door closers, and coordinators
Sealing System:
- Frames should include sealing grooves filled with non-combustible intumescent strips

IV. Appearance and Surface Quality Control

To meet visual and structural standards in industrial environments:

Welding Quality:
- Welds must be firm, evenly spaced, and free from burn-throughs or false welding
- Surfaces should be smooth and uniform
Painting Finish:
- A uniform anti-rust primer coat must be applied via spray-painting
- No visible defects such as paint runs, missed spots, bubbles, or pinholes

YK fire rated door manufacturer ensures that every steel fire door—whether for warehouse facilities, data centers, or high-traffic commercial door installations—complies with these stringent criteria. Each unit is designed for both regulatory approval and real-world performance.

Dimensional tolerance table

Part name	Limit deviation（mm）	Part name	Limit deviation（mm）
Door leaf height	＋2；-1	Height of door frame notch	±3
Door leaf width	＋1；－3	Height of door frame sidewall	±2
Door leaf thickness	＋2 ；－1	Height of door frame notch	±1

Form and position tolerance table

Name	Measurement item	tolerance（mm）
doorframe	Length difference between two diagonal lines of notch	3
door leaf	Length difference between two diagonals	3
	torsion resistance	5
	Height curvature	2
doorframe、door leaf	Height difference between door frame and door leaf（Front surface）	3

Form and position tolerance table

Custom steel fireproof door – Technical Standard Requirements

Applicable National Standards

The custom steel fireproof doors supplied for this project must comply with the following Chinese national (GB) and industry standards:

GB 191: Packaging, Storage, and Transportation Symbols
GB 5464: Test Methods for Non-Combustibility of Building Materials
GB 5823: Terminology of Building Doors and Windows
GB 5824: Dimension Series for Building Doors and Windows Openings
GB 5825: Symbols for Opening Direction and Surface of Building Doors and Windows
GB 6388: Transportation Packaging Marks for Shipping and Receiving
GB 7633: Fire Resistance Test Methods for Doors and Shutters
GB 13685: Classification and Testing of External Doors and Wind Pressure Performance
GB 13686 / GBJ 16: Building Design Fire Protection Specifications
GBJ 45: Fire Protection Design for High-rise Civil Buildings
GBJ 210: Acceptance Criteria for Construction Decoration Engineering
TJ 9: Load Standards for Industrial and Civil Building Structures

I. Fire Resistance Performance

Grade A fire doors: Fire resistance ≥ 1.2 hours
Grade B fire doors: Fire resistance ≥ 0.9 hours

II. Opening Direction Requirements

Right-opening door leaf: Clockwise rotation
Left-opening door leaf: Counterclockwise rotation
All fire doors must open toward evacuation paths

III. Technical Material Requirements

Steel Components:
- Door frame: ≥ 1.5mm cold-rolled steel
- Door leaf panel: ≥ 1.2mm cold-rolled steel
- Reinforcements: ≥ 1.5mm steel (≥ 3.0mm if with screw holes)
Core Filling: Non-combustible fireproof material
Hardware Fittings:
- Fire-resistant locks, hinges, bolts with melting point ≥ 950°C
- No bidirectional hinges; single-leaf doors must use door closers
- Double-leaf doors must include overlapping astragal, closers, and coordinators
Sealing:
- Door frames must contain non-combustible sealing strips in groove channels

IV. Appearance and Finishing Quality

Welding: Firm, smooth, uniform; free from false welds, burns, or gaps
Surface:
- No scratches, dents, or surface deformities
- Spray-coated with anti-rust primer; no bubbles, pinholes, sagging, or paint skips

V. Installation Gap and Tolerance

Contact Overlap: ≥ 10mm at midpoint of both vertical and top edges
Gap Tolerances:
- Between door leaf & frame (sides): ≤ 4mm
- Top edge: ≤ 3mm
- Double door center gap: ≤ 4mm
All measurements accurate to 1mm

Fire-Rated Roller Shutters – Technical Standard Requirements

I. Design and Performance Requirements

Fire Rating: ≥ 3 hours, measured by temperature rise on the unexposed side
Type:
- Underground Areas: Water mist steel super-grade fire shutters
- Other Areas: Dual-track inorganic fabric-based super-grade fire shutters
Functionality:
- Wall-installed shutters: Single-step closing
- Evacuation routes: Must have two-step descent mechanism
Installation: Must be attached to load-bearing structure; gaps above headbox sealed with ≥ 3-hour rated fireproof material
Design Compliance: Conforms to GB50201—2001 for quality acceptance

II. Operation and Control Systems about Custom steel fireproof door

Shutters must support manual, electric, and automatic operation
Control boxes should include smoke and temperature detection systems
Must integrate with building fire alarm systems for automated activation
Temperature-sensing release devices activate at 73°C

III. Structural and Material Specifications

Curtain Composition:

Double-layer inorganic fireproof fabric
Air gap: 200–500mm between layers
Curtain structure:
- Fireproof cloth + aluminum silicate felt + decorative cloth
- Reinforced with stainless steel wires and galvanized clamps
Curtain surface weight: ≤ 3.5kg/m²
Not directly connected to the shaft; fastener-based linkage required

Performance Metrics:

Seam count per meter ≤ 3; overlap ≥ 20mm (load-bearing), ≥ 10mm (non-load-bearing)
Fabric must remain elastic at -20°C and non-sticky at +50°C
Tensile strength:
- Longitudinal ≥ 600N/5cm
- Transverse ≥ 300N/5cm
Combustion grade:
- Decorative cloth: GB8624-1997 B1
- Base cloth: GB8624-1997 A

IV. Structural Hardware Requirements

Guide Rails: 1.5mm galvanized steel; arc-shaped top; ≤ 5mm parallelism deviation
Roller Shaft: Welded or seamless steel pipe; deflection < 1/400 shaft length
Seat Plate: ≥ 3mm thick; evenly contacting ground
Transmission Chain: Complies with GB/T1243; safety factor >4
Roller Machine & Control Box:
- Must be type-approved by national fire testing authority
- Must comply with GB14102—2005 Appendix A and B
Environmental Requirements: All materials must meet national environmental and health standards

V. Installation Tolerances

Guide Rail Embedment: Increases by 10mm for each additional 1000mm width
Verticality Error: ≤ 1.5mm/m or total ≤ 20mm
Embedded Steel Spacing: 600–1000mm

III. Technical Standards
All provided products must comply with national, Yunnan Province, and Kunming City regulations, codes, and standards, and have the qualifications for sale and use in Kunming, Yunnan Province. These specifications and standards include, but are not limited to:

Building Design Fire Protection Specification GBJ16-87
Fire-rated Roller Shutters GB14102-2005
General Atlas of Steel Fire Doors and Fire-rated Roller Shutters Construction 88J13-4
Fire Resistance Test Methods for Doors and Roller Shutters GB/T7633—87
Fire Doors and Windows 03J609
Unified Standard for Construction Quality Acceptance of Building Engineering GB50300—2001
Quality Acceptance Specification for Building Decoration and Renovation Engineering GB50201—2001

Interconductor distanceB	Each end is embedded in depth
B＜3000	＞45
3000≤B＜5000	＞50
5000≤B＜9000	＞60

Embedded depth Unit: mm

Technical Standards for Custom Steel Fireproof Entrance Doors

UL CE WOODEN FIRE DOOR-Custom steel fireproof door

I. Applicable Codes and Standards

All supplied products must fully comply with national laws, Yunnan Province, and Kunming City building codes and technical standards. The products must be qualified for sale and installation in Kunming, Yunnan Province. Applicable regulations include, but are not limited to:

GBJ16-87: Building Design Fire Protection Specification
GB14102-2005: Fire-Rated Roller Shutters
88J13-4: General Atlas of Steel Fire Doors and Fire-Rated Roller Shutters Construction
GB/T7633—87: Fire Resistance Test Methods for Doors and Roller Shutters
03J609: Fire Doors and Windows
GB50300—2001: Unified Standard for Construction Quality Acceptance of Building Engineering
GB50201—2001: Quality Acceptance for Building Decoration and Renovation Engineering

Interconductor Distance and Embedded Depth (Unit: mm)

B (Span)	Embedded Depth
B < 3000	≥ 45 mm
3000 ≤ B < 5000	≥ 50 mm
5000 ≤ B < 9000	≥ 60 mm

II. Basic Requirements about Custom steel fireproof door

Doors must be of spray-painted steel and include a nameplate, peephole, and a space for a doorbell.
Door type: Inward-opening swing door, as shown in architectural plans.
Lock area must include a reinforcing steel plate (≥3 mm thick) within a 100 mm radius around the lock hole to resist penetration and unauthorized unlocking.
Lock components must be fire-rated for doors with fire protection functions.
Lock core projection should be ≤2 mm; all other parts must not be exposed but should allow maintenance.
Door dimensions must conform to design drawings.
All metal parts must be corrosion-resistant, with anti-rust primer and a smooth, even paint finish, free from flaws like bubbling, peeling, or discoloration.
No sharp edges, burrs, or unsafe surfaces on accessible areas.
Welds must be uniform and solid, with no defects (e.g., cracks, slag, spatter). Ripple height variation should not exceed 1 mm per 100 mm.
Lap weld overlaps must be ≥8 mm; joint height difference ≤2 mm.
Fillet weld tensile strength ≥180 N/mm²; T-joint welds ≥150 N/mm².
Steel thickness: Door leaf ≥ 0.7 mm, Door frame ≥ 1.0 mm.
Finish color and texture subject to buyer’s selection and confirmation.

III. Door Frame & Door Leaf Requirements

Dimensions must conform to engineering specifications.
Diagonal length difference of door frames and leaves must meet the values in Table 4.
When closed:
- Top gap ≤ 4 mm
- Lock side gap ≤ 3 mm, or ≤ 5 mm if reinforced
- Hinge side gap ≤ 5 mm (leaf thickness < 50 mm), ≤ 6 mm (leaf thickness ≥ 50 mm)

Frame-to-Wall Connection

Door frame must include longitudinal anchors (≥10 mm diameter) spaced ≤ 800 mm.
Anchors must resist a 2000 N shearing force without significant deformation.
Welds must not hinder door movement.

Anti-Prizing Structure

The grille area must have a steel baffle extending at least 400 mm above and below the lock hole.
The door body must withstand attempts to breach a 615 cm² area using common tools for 10 minutes.
Grilles should use a through-flower structure; gaps ≤ 35 mm, with all joints resisting 2000 N without damage.

Double-Leaf Doors

The fixed side’s locking mechanism must resist a 4000 N force without damage.
The door leaf and locking systems must withstand 9 impacts by a 30 kg sandbag without structural failure. Inward deformation ≤ 5 mm.
A sealing strip must be included.

IV. Door Hinges

Hinges must:
- Support the full weight of the door.
- Allow smooth 90° rotation with ≤ 49 N pulling force.
- Be able to withstand 10 minutes of physical attack without breakage.
- Be welded flush without protruding welds.
Under 6000 N pressure in the opening direction:
- Frame-to-leaf displacement ≤ 8 mm
- Inward deformation ≤ 5 mm

V. Locks and Assembly

Locks must comply with GA/T73-94 Mechanical Anti-theft Locks.
Keys must provide ≥ 6,000 combinations with a mutual opening rate ≤ 0.08%.
Pin tumblers must differ by ≥ 0.5 mm.
After 6,000 opening/closing cycles, the lock must show no loosening or misalignment.
Under 6000 N pressure, locks must remain functional and not deform inward > 5 mm.

VI. Additional Provisions-Custom steel fireproof door

Indoor environmental safety and hygiene standardscurity, Ministry of Construction, Kunming City, Yunnan Province on metal household doors processing and installation, as well as the relevant regulations and requirements for the indoor environment.

Processing and installation must conform to:

National standards

Ministry of Public Security and Ministry of Construction regulations

Yunnan Province and Kunming City local building door regulations

Table 3 mm

Width and height	<1 500	>1 500
permissible error	±3	±4

Table 4 mm

Measured diagonal length	<2 000		2 000~3 500	> 3 500
Allow length difference	≤4		≤5	≤6

Technical Standards by YK Fire Rated Door Manufacturer

Compliance with National Building and Fire Safety Standards