Overview
Class C fire doors are engineered to withstand fire exposure for at least 30 minutes, as defined by international building codes like China's GB 12955 standard. They serve as critical barriers in passive fire protection systems, installed in corridors, stairwells, and between building zones to slow fire progression. Unlike higher-grade doors (Class A/B), Class C strikes a balance between cost and performance for moderate-risk areas. Their design integrates fire-resistant cores, often mineral wool or vermiculite boards, enclosed in steel or treated wood frames to maintain structural stability under heat.
Structure and Working Principle
A typical Class C door comprises a fire-rated core sandwiched between durable facings, such as 1.2mm steel sheets. Intumescent seals along edges expand when heated, sealing gaps to block smoke and flames. Hinges and latches are heat-resistant to ensure functionality during emergencies. The door's effectiveness relies on proper installation within fire-rated frames and walls. Self-closing mechanisms, often via spring hinges or door closers, automatically shut the door post-evacuation. Some models include vision panels with ceramic glass rated for 30-minute integrity.
Key Features
Certified Class C doors undergo rigorous testing, including exposure to 800°C temperatures while maintaining integrity and insulation. Key features include UL-listed or CE-marked components, non-combustible thresholds, and compatibility with fire alarm systems. Modern variants offer aesthetic customization—powder-coated finishes or wood veneers—without compromising safety. Lightweight designs (for timber alternatives) ease installation while meeting load-bearing requirements for high-traffic areas.
Application Areas
These doors are mandated in commercial kitchens, office partitions, and residential building egress routes under most national fire codes. They’re also used in HVAC penetrations and electrical rooms where fire risks are localized. In B2B contexts, contractors procure them for hospitals, schools, and hotels where compartmentation is vital. Industrial applications include separating warehouse storage zones containing flammable materials (e.g., paper, textiles).
Maintenance and Precautions
Quarterly inspections should verify seal integrity, hinge functionality, and frame alignment. Damaged intumescent strips must be replaced immediately, as gaps as small as 3mm can compromise performance. Avoid drilling or painting doors post-installation unless using approved fire-retardant coatings. Ensure clearance beneath the door doesn’t exceed 10mm to prevent smoke draft. Partner with certified installers to maintain warranty validity.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO 9001 certification and test reports from accredited labs like UL or CNAS. Bulk orders (50+ units) often attract 10–15% discounts, with lead times of 4–6 weeks for customized sizes. Request samples to validate core material density (≥45kg/m³ for mineral cores) and frame thickness. Include installation clauses in contracts, as improper mounting voids certifications. Coastal projects may require stainless steel hardware to resist corrosion.
Related Manufacturers
- 主营：[]
- 主营：[]
- 主营：[]
- 主营：防火卷帘门、快速门、pvc快速门、卷帘门、抗风门、快速堆积门、钢制卷帘门、堆积门、挡烟垂壁
- 主营：[]
- 主营：[]
- 主营：医用钢质门、医疗病房门、手术室电动门、钢质气密门、净化钢质门、气密医疗门、电动平移门、病房钢质门、钢制医疗门、医用门厂家、手术室平移门厂家、气密门厂家
- 主营：钢质防火门、门窗出口贸易、防火卷帘门、工业提升门、特种门、电动伸缩门、不锈钢防火门、超大电动门、防火窗
- 主营：防火门
- 主营：消防门、防火门、森林门窗、门窗定制、防爆门窗、特种门窗、多功能门窗、防火玻璃门窗、防火防盗门窗、防火抗爆门窗、不锈钢防火门、钢质防火门、钢质消防门、防火隔音门、工程防火门、精装防火门、商场防火门、医疗防火门、不锈钢玻璃防火门、木质防火门、防火卷帘门、住宅楼防火门、防火门定制、甲级防火门、防火窗
- 主营：耐火窗、防火窗、挡烟垂壁、防火门、防火卷帘门、防盗门、入户门、楼宇门、百叶窗
- 主营：钢质门、防盗门、别墅门、进户门、防火门、防火玻璃门、防火卷帘门、防火窗、防火平开窗
- 主营：防火门、特种门、通州区铜门、爆款工业门、断货港闸区铜门、爆款崇川区铜门、断货开发区铜门、优质防火卷帘门、防火窗
- 主营：防火窗、耐火窗、防火卷帘、防火门、防盗门、猪舍门、消防箱、楼宇门、入户门、防爆门、进户门、教室门、钢质玻璃防火门、弹簧自由门、软包隔音门、钢质泄爆门、电动百叶窗、铝质泄爆窗、电动挡烟垂、固定式安装、锌钢百叶窗
- 主营：泄爆门、防盗门、隔音门、监狱门、铜室门、防爆门、抗爆门窗、仓库车间抗爆门、通风窗、密闭窗、泄压防爆墙
- 主营：防火门
- 主营：防火窗、泄爆窗、防爆窗、泄爆门、防盗门、楼宇门、入户门、防爆门、防火门、进户门、耐火窗、防火卷帘、固定挡烟垂壁、硅胶布挡烟、电动挡烟垂壁
- 主营：钢质防火门、木质防火门、卷闸门、卷帘门、快速门、电动伸缩门、工业门、水晶门、不锈钢网型门、防火门、防火卷帘、挡烟垂壁
- 主营：家用防火门、医用洁净门、防火防盗门、不锈钢防火门、隔热防火窗
- 主营：自动门、卷闸门、卷帘门、地簧门、拉闸门、提升门、伸缩门、防火门、车库门、平移门、玻璃门禁、欧得力门业、推拉折叠门、玻璃感应门、水晶折叠门、肯德基门、快速卷帘门、铝合金卷闸门、玻璃自动门、不锈钢卷闸门、水晶卷帘门
- 主营：隔音防爆窗、防爆泄爆窗、耐火窗、防爆门、车间厂房门、门款式多样、防护密闭门、门泄爆门窗、工程进户门、楼宇门、宿舍门、钢质门、泄爆门、不锈钢门、泄爆窗、平开窗、疏散楼梯间、家用耐火窗、工业泄爆窗、开窗隔热窗、钢质防火窗、断桥耐火窗、泄压泄爆窗、隔热防火窗