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Certified steel fire doors with cold-rolled steel skins and a fire-rated core. Choose Class A (90 min), B (60 min) or C (30 min), fitted with fire locks, closers and sequencers. Ideal for stairwells, lobbies and service shafts.
A steel fire door is built from cold-rolled steel leaves and frame with a fire-rated insulating core, and is equipped with fire-rated locks, hinges, closers and sequencers. In a fire it preserves integrity, insulation and smoke control, giving people a safe means of escape and protecting fire compartments.
Doors are graded by fire resistance: Class A (≥90 min), Class B (≥60 min) and Class C (≥30 min), covering stairwells, lobbies, service shafts and plant rooms. They are tested to recognised fire-resistance standards and supplied with full certification and inspection documentation.
Structure Design
Structure & Build Details
Every element, from leaf to frame, is engineered for the stable, long service life of the Steel Fire Door.
◆
Double-Skin Steel Leaf
0.8/1.0/1.2 mm cold-rolled steel leaves with a pearlite or fire-rated core.
◆
Formed Steel Frame
One-piece cold-formed frame with intumescent seals for smoke control.
◆
Fire-Rated Hardware Kit
Fire lock, fire hinges, closer and sequencer supplied as a matched set.
◆
Intumescent Seal
Edge seals expand under heat to block smoke penetration.
◆
Vision Panel (Optional)
A fire-rated glazed panel for inspection without affecting the rating.
Core Advantages
Steel Fire Door Core Advantages
Why specify a Steel Fire Door? Six values that matter most.
✓
Reliable Fire Rating
From 90 min upward, effectively blocking fire and smoke.
✓
Full Certification
Tested and certified, ready for compliance and inspection.
✓
Matched Hardware
Lock, closer and sequencer work together for reliable self-closing.
✓
Smoke Control
Intumescent seals stop smoke migrating between compartments.
✓
Robust & Secure
The steel body also provides a degree of intrusion resistance.
✓
Cost-Effective
More economical and durable than timber or stainless alternatives.
Technical Parameters
Key Specifications
Standard configuration of the Steel Fire Door; customised to your opening and duty.
Fire Rating
Class A 90 min / B 60 min / C 30 min
Leaf Skin
0.8 - 1.2 mm cold-rolled steel
Core Material
Fire-rated perlite / ceramic fibre
Configuration
Single / Double / Leaf-and-a-half
Hardware
Fire lock + closer + sequencer
Certification
Fire-resistance tested & certified
Typical Use
Stairwell / lobby / shaft / plant room
Manufacturing
Manufacturing Process
A standard five-step process keeps every Steel Fire Door consistent and ready to install.
Steel Slitting
Cold-rolled coils are slit and cut to precise leaf dimensions.
Press & Weld
Leaves and frame are pressed, formed and welded square.
Core Filling
Fire-rated core is inserted and the leaf is sealed.
Finish Coating
Anti-rust primer plus top coat for durable finish.
Hardware Fitting
Fire lock and closer fitted and adjusted to limits.
Quality Inspection
Quality Control & Standards
Each Steel Fire Door passes the following checks before dispatch:
Fire-resistance tested by accredited lab
Smoke-leakage measurement
Hardware cycle-life sampling
Dimensional & flatness inspection
Certification and documentation check
Applications
Where It Is Used
The Steel Fire Door serves a wide range of scenarios:
▶
Escape stairwells
▶
Lobbies & shared lobbies
▶
Electrical / mechanical shafts
▶
Plant & equipment rooms
▶
Fire-compartment walls
▶
Basement & garage passages
Installation
Installation Requirements
Professional installation is the premise of a long, stable service life:
Fix frame to wall with expansion bolts
Fill frame gaps with fire-rated mortar
Fit sequencer on double leaves for correct closing order
Adjust closer force to leaf weight
Keep under-door gap within the permitted limit
Maintenance
Maintenance Tips
Simple care keeps the Steel Fire Door performing at its best:
Test the closer monthly
Check seals for ageing or detachment
Lubricate hinges periodically
Never modify or wedge the door open
Annual functional check by a qualified party
FAQ
10 Frequently Asked Questions about Steel Fire Door
The most common questions from buyers and specifiers, answered.
1. How do I choose Class A, B or C?
Follow the fire-design drawings: lobbies and stairwells usually Class B, critical plant rooms Class A, and service shafts Class C.
2. Is certification mandatory?
Yes. Fire doors must carry valid fire-resistance certification and an identity label; otherwise they will fail inspection.
3. Can it be used as a security door?
The steel leaf offers some intrusion resistance, but it is not a substitute for a rated security door at critical entrances.
4. Does a vision panel affect the rating?
No. A properly framed fire-rated glazed panel keeps the original fire rating.
5. Why does a double leaf need a sequencer?
The sequencer ensures the active and inactive leaves close in the correct order, preventing a smoke gap at the meeting stile.
6. What are the key installation points?
Frame anchored with bolts, gaps filled with fire-rated material, and the closer correctly adjusted.
7. How should I maintain it?
Test the closer monthly, inspect seals, and keep the door in the closed position.
8. How long does it last?
With proper care it serves well over 10 years; the closer and seals are the parts to watch.
9. Can I choose the colour?
Standard powder-coat colours are available to match the building facade; compliance comes first.
10. How is price calculated?
By fire rating, opening size and hardware specification; direct-from-manufacturer pricing is most competitive.
Get a Compliant Steel Fire Door Quotation
Send us your fire-rating requirement and opening sizes, and we will match Class A/B/C configuration and prepare the certification paperwork.
Company Introduction
Hunan Lianxin Chitai Intelligent Doors & Windows Co., Ltd. is a manufacturer specializing in the research, development, production, sales, and service of intelligent doors and windows. Established in 2010, the company evolved from Changsha Lianxin Door Industry Processing...
Company Introduction
Hunan Lianxin Chitai Intelligent Doors & Windows Co., Ltd. is a manufacturer specializing in the research, development, production, sales, and service of intelligent doors and windows. Established in 2010, the company evolved from Changsha Lianxin Door Industry Processing...
