Explore our elite portfolio of fire-resistant and steel armored entries built to exceed global regulatory testing criteria.
In modern architectural design, security doors are no longer evaluated solely by their capacity to delay physical break-ins. The convergence of building safety codes and complex risk profiles has demanded a new class of entrance barrier: the Fire Rated Armored Door. This specialized hardware combines the brute ballistic and physical resistance of high-gauge steel plate reinforcement with the thermal insulation properties required to survive extreme high-temperature fires.
Unlike standard wood or hollow metal doors, a fire-rated armored door is built using a multi-layered sandwich assembly. The exterior layers are constructed from heavy-duty galvanized or electro-galvanized steel sheets, enclosing an internal matrix of reinforcing ribs. Between these structural steel webs lies a proprietary core of thermal insulation material, such as high-density rock wool, ceramic fiber board, or perlite. This core prevents thermal bridging, ensuring the unexposed face of the door remains within safe temperature limits, allowing occupants to evacuate and rescue teams to operate.
Furthermore, these doors feature specialized intumescent seals along the perimeter. When temperatures rise above 150°C, these seals expand up to 25 times their original volume, forming a gas-tight barrier that prevents toxic smoke and hot combustion gases from penetrating the safe zone. For architects and contractors, selecting a qualified manufacturer ensures compliance with standards like EN 1634-1, BS 476, and UL 10C.
A premier manufacturing powerhouse delivering custom entry solutions to global infrastructure and commercial developments.
Zhejiang Larsom Door Co., Ltd. is a leading manufacturer specializing in the research, development, production, and global distribution of high-performance security doors, armored entry systems, steel-wood doors, and custom-tailored architectural openings. Since our founding, we have focused on providing contractors, real estate developers, and security integrators with durable, stylish, and internationally compliant door products.
Today, our modern manufacturing campus spans over 16,000 square meters, powered by a dedicated engineering and production team of more than 160 employees. Thanks to our integrated production management systems, we maintain a reliable daily capacity exceeding 200 premium door sets. This scale allows us to fulfill large commercial project requirements while accommodating custom OEM/ODM architectural configurations without compromising lead times.
To support this high-volume output with precision quality, Larsom Door has invested in automated machinery. Our workshop is equipped with CNC laser cutting stations, high-accuracy CNC bending machines, automated welding networks, high-speed turret punches, auto-sanding lines, and dust-free powder coating booths. This heavy machinery infrastructure ensures consistent tolerances within sub-millimeter scales, keeping every manufactured door aligned with global project specifications.
How we construct each armored door layer by layer under strict ISO 9001 QA protocols.
How changing global construction standards impact B2B sourcing requirements for high-performance doors.
Modern building regulations in the EU, UK, and North America mandate that fire door assemblies prove certified integration. The market has moved away from "component-only" ratings to comprehensive assemblies where the door frame, leaf, hinges, and locks are tested together to guarantee integrity (E) and insulation (I) metrics.
High-value commercial infrastructure and upscale residential developments now demand integrated protection. Sourcing managers look for solutions that combine fire ratings (up to 180 minutes) with ballistic (bulletproof) resistance and acoustic dampening to reduce installation steps and lower overall costs.
Green building frameworks like LEED and BREEAM have driven the demand for doors manufactured under clean practices, utilizing zero-VOC coatings, recycled steel content, and sustainably sourced wood components. At Larsom, our advanced UV production lines reflect this commitment to environmental standards.
Engineered options tailored to the safety and durability requirements of critical infrastructure and high-value properties.
Different commercial sectors present distinct challenges when it comes to life-safety openings. Zhejiang Larsom Door Co., Ltd. develops targeted solutions designed to withstand high-volume wear and environmental factors:
A breakdown of our manufacturing standards, testing protocols, and product configurations.
| Performance Parameter | Standard Certifications | Material & Construction Limits |
|---|---|---|
| Fire Resistance Ratings | UL 10B, UL 10C, NFPA 252, BS 476 (Part 22), EN 1634-1 | 30 / 60 / 90 / 120 / 180 Minutes (Class A & B ratings) |
| Ballistic Resistance | EN 1522 / NIJ IIIA / UL 752 Standards | High-density ballistic steel backing, customizable frame armor plates |
| Acoustic Attenuation | ISO 10140-2 / ASTM E90 (Sound Transmission Class) | Acoustic core options with drop-down automatic seals (Up to 45 dB reduction) |
| Wind & Water Resistance | EN 12211 / ASTM E330 Hurricane Loadings | Waterproof EPDM gasket seals, high-load anchor bolts for high pressure |
Direct answers to technical queries from structural engineers, architects, and procurement managers.
Heavy-duty structural configurations designed for demanding commercial and infrastructure projects.
Larsom Door
