Factory Direct Fire Doors
Better Than Global Standards
No Middleman, Factory Direct Low Price Fast Production, 10-15Day Lead Time Door-to-Door Delivery to Your Site
R&D & Manufacturing Expertise
Square Meters
National Utility Patents
Customizable Product Series
About us
Premium And Affordable Fire Doors For Your Large Project Or Small Order, We Do It All!
Longzhengsheng is a leading high-tech manufacturer of fire-rated doors and windows, with over 10 years of industry expertise. Operating two large-scale production bases, we hold ISO 9001 certification, 16 national utility patents, and all our products exceed global safety standards. As a direct factory, we deliver custom solutions for residential, commercial, medical and industrial scenarios, with flexible production to match your unique project needs. We offer competitive factory-direct pricing, fast lead times and reliable global delivery to keep your projects on track.
Premium Certified Fire-Rated Doors
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Large Steel Fire-Rated Door
- 1.5-hour Class A fire resistance rating
- 1.5mm frame / 1.0mm door galvanized steel construction
- 35dB sound insulation & Class 7 thermal performance
- Heavy-duty hinges matched to door weight
- Eco-friendly, non-toxic filling materials
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Steel Fire-Rated Door
We offer two fire rating options to match your project requirements:
– Class A Fire Door: 1.5-hour fire resistance, 1.2/1.5mm galvanized steel frame, 0.8/1.0mm steel door panel
– Class B/C Fire Door: 1H/0.5H fire resistance, 1.2/1.5mm galvanized steel frame, 0.8/1.0mm steel door panel
*All options come with Class 7 thermal insulation & 35dB sound insulation* -
2 Hour Fire Rated Steel Door
✅ 2-Hour Fire Resistance: Meets EN 1634-1, UL 10B & GB standards, provides 120 mins of fire/smoke containment.
✅ Premium Steel Build: 0.8-1.5mm galvanized steel for excellent corrosion resistance, ideal for Middle Eastern climates.
✅ Fully Customizable: Sizes, single/double leaf, vision panels, hardware & finishes available on request.
✅ Fast Lead Time: Standard orders ship in 10-15 working days; expedited service available.
✅ Wide Applications: Suitable for commercial buildings, warehouses, factories & public facilities.
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Explosion-Proof Doors
Explosion-Proof DoorsExplosion-Proof DoorsExplosion-Proof Doors
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Explosion Proof Steel Door
✅ Heavy-duty explosion-proof steel door with high blast resistance for hazardous industrial environments.
✅ Built with thickened high-strength galvanized steel for maximum durability & corrosion resistance, ideal for Middle Eastern climates.
✅ Pressure-tested structure meeting strict industrial safety standards, reliable blast containment.
✅ Fully customizable sizes, pressure ratings, hardware & surface finishes available.
✅ Fast lead time: 10-15 working days for standard orders, expedited service available.
✅ Suitable for oil & gas facilities, chemical plants, power stations & high-risk industrial sites.
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Industrial Anti-Blast Security Door
✅ Industrial anti-blast security door with dual explosion-proof & anti-theft protection, meets international industrial safety standards.
✅ Thickened high-strength steel structure, strong impact resistance & deformation resistance for harsh working sites.
✅ Excellent corrosion & rust resistance, perfectly adapted to high-temperature & dusty climates in the Middle East.
✅ Fully customizable sizes, pressure levels, hardware & surface finishes to match project demands.
✅ Fast production lead time: 10-15 working days, expedited service available for urgent orders.
✅ Ideal for oil & gas stations, chemical plants, warehouses & high-risk industrial facilities.
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Single Leaf Fireproof Security Door
✅ Industrial-grade single-leaf fireproof security door with 2-hour fire resistance, meeting EN 1634-1, UL 10B & GB standards.
✅ Heavy-duty galvanized steel build, anti-corrosion, ideal for Middle Eastern industrial environments.
✅ Integrated fireproof & anti-theft design with reinforced structure.
✅ Fully customizable sizes, hardware and finishes available on request.
✅ Fast lead time: 10-15 working days for standard orders, expedited service available.
✅ Suitable for factories, warehouses, workshops & industrial facilities.
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Double Leaf Fire Resistant Door
✅ Double-leaf fire resistant door with 2-hour fire rating, meets EN 1634-1, UL 10B & GB standards.
✅ Heavy-duty galvanized steel construction, excellent corrosion resistance for Middle Eastern climates.
✅ Double-leaf design for wide openings, ideal for large commercial/industrial spaces.
✅ Fully customizable sizes, opening directions, hardware & finishes available.
✅ Fast lead time: 10-15 working days for standard orders, expedited service available.
✅ Perfect for large public buildings, factories, warehouses & high-traffic areas.
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Fire Door Manufacturing: In-House Quality You Can Trust
Premium Certified Fire-Rated Doors
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Long Zheng Sheng Fire Doors — Frequently Asked Questions: Selection, Installation & Maintenance （1）
To assist you in better understanding, selecting, and installing Long Zheng Sheng brand fire-rated doors, we have compiled the most frequently encountered inquiries from our project support channels and customer service team, along with detailed responses. We trust this guide…
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Special Design Features for Blast Resistant & Fire Doors in Chemical Plants & Oil Depots
Blast resistant doors (Blast Resistant Door / Explosion Proof Door) and fire doors (Fire Door) are often combined or functionally overlapped in chemical plants, oil depots, refineries, and other flammable/explosive environments. However, their core protection objectives are fundamentally different: blast…
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Are intumescent seals required on fire doors, and how much do they expand under fire conditions?
An intumescent fire seal (Intumescent Fire Seal) is a passive fire protection component installed in the rebate (groove) between the door leaf and frame of a fire-rated door. At ambient temperature it appears as a thin strip or rubber-like gasket;…
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What are the steel plate thicknesses for the door frame and door leaf of a steel fire door, respectively?
A steel fire door is a door assembly constructed with cold-rolled or galvanized steel sheets as face panels, internally filled with non-combustible thermal insulation material, capable of maintaining fire integrity and insulation for a specified duration. The steel plate thickness…
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Fire Door Fire Resistance Rating Selection Guide: How to Choose Grade A, B, or C?
The 2024 edition of the standard (GB 12955-2024) retains the popular Grade A/B/C classification while introducing an internationally aligned Class A (insulation), Class B (partial insulation), and Class C (non-insulation) classification system, covering the complete fire resistance rating range from…
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What protection does an intumescent core provide during a fire
In the challenging environments of Middle East construction, fire doors must do more than just stand in the way of flames. When a fire breaks out, the Intumescent Core transforms from a static internal component into an active safety system….
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What materials are used as fire door infill? And what are the density and fire resistance specifications?
Fire Door Infill Material Fire door infill material refers to the non-combustible core material filled inside the door leaf and frame of a fire-rated door, providing thermal insulation during fire exposure. According to the current national standard GB 12955-2008 Fire…
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How Expanded Vermiculite Cores Secure High-Rise Projects in the Middle East: A Technical Overview
During the construction of a landmark hotel project in Riyadh, the engineering team faced a critical challenge: how to ensure fire doors could maintain their integrity under the dual pressure of a localized fire and the extreme external heat of…
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How to Select Fire-Rated Galvanized Steel Door Frames: A Guide for Middle East Contractors
In my 20 years of installing fire doors across the Gulf, I’ve seen it all—from coastal humidity in Jeddah to the blistering heat of Riyadh. Most people focus on the door leaf, but as a veteran, I’ll tell you: the…
