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Class B Insulated Fire-Resistant Windows are also crucial components of passive fire protection systems in buildings, and are subject to mandatory national certification (3C). According to the national standard "Fire-Resistant Windows" (GB 16809), they are classified as Class A insulated fire-resistant windows, specifically A1.0 grade. Their core performance indicators are: fire resistance and heat insulation ≥ 1.0h (60 minutes), and fire integrity ≥ 1.0h. Similar to Class A windows, they not only maintain window integrity and prevent flame and heat penetration for up to one hour during a fire, but also effectively block the transfer of high-temperature heat to the unexposed side (temperature rise on the unexposed side not exceeding 140℃).
The export version also utilizes two mainstream, mature materials in the industry, adapting to the specific needs and budgets of different overseas projects. The steel Class B fire-resistant window is constructed from thickened galvanized steel sheet, integrally bent, resulting in a robust and stable overall structure with excellent impact and deformation resistance. The window frame is filled with high-density flame-retardant and heat-insulating material, paired with multi-layer composite heat-insulating fireproof glass. The surface is treated with anti-corrosion powder coating, making it rust-resistant and wear-resistant. Suitable for low- to medium-risk fire scenarios such as overseas shops, small factories, and warehouse ancillary buildings, it offers stable quality and affordable cost.
Differences from Class A / External Wall Fixed Fireproof Windows
vs Class A A1.5
Class B only provides 1.0 h of fire resistance. The glass is thinner and the cost is lower. The frame requirements are the same, but it is rarely used in extremely high-risk buildings.
vs External Wall Fixed Fireproof Windows
If the design specifies "Class B, Class A Fixed," it means a Class B Insulated Fire-Resistant Window (steel frame + composite heat-insulating glass, non-openable). If the external wall only requires integrity, C1.0 non-insulated windows can be used, but "heat insulation" must be achieved with composite glass.
This product is mainly used in areas with certain fire separation requirements, commonly found in the following scenarios:
Indoor Fire Separation
Installed on firewalls or fire-resistant partitions where windows are needed for lighting or observation.
Building Exterior Wall Openings
Used for openings in exterior walls where the fire separation distance between adjacent buildings is insufficient, to prevent the spread of external fire.
Shaft And Duct Crossings
Fire separation between floors in some ventilation duct shafts, smoke exhaust duct shafts, and other shafts with special requirements.
Our Quality
Same as Class A: CCC/CCCF certification + type test report + nameplate marked A1.0 / 1.0 h;
Frame and opening are fixed with M10 expansion bolts (angle distance ≤150–200 mm, center distance ≤600 mm);
Frame-wall joints are filled with fireproof rock wool + fireproof sealant; ordinary expanding foam is strictly prohibited;
For movable types, a 68℃ temperature sensor must be tested for closure within ≤60 seconds and feedback; for fixed types, only verticality, sealing, and glass retaining strips are checked (screws ≤200–300 mm);
Compliance: Product GB 16809-2024, Installation GB 50877-2014, Fire Protection Standard GB 55037-2022.
Overall, Class B Insulated Fire-Resistant Windows are highly practical basic protective accessories in building fire protection systems. It doesn't excessively pile on high-end performance; instead, it precisely matches the fire protection needs of conventional buildings. While offering fire resistance, heat insulation, smoke sealing, weather resistance, and durability, it also considers project cost control. For the vast majority of overseas residential and light commercial buildings, it is a compliant, reliable, cost-effective, and widely applicable fire protection product, and an indispensable standard fire protection configuration in foreign trade window and door projects.
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