Under BNBC 2020 Part 8, fire-rated glazing in Sylhet commercial buildings is typically required to achieve a minimum 60-minute fire resistance rating (EI 60) for stairwell enclosures and corridor partitions. This rating ensures both integrity (E) and insulation (I) performance, meaning the glass must prevent flame and hot gas penetration while limiting the temperature rise on the unexposed side to an average of ≤140°C and a maximum of ≤180°C. For specific high-occupancy or high-risk areas, such as fire command centers or egress paths serving large floor plates, a higher rating of EI 90 or EI 120 may be mandated by the local fire authority. Antifires supplies systems certified to these ratings under BS 476 Part 22 and BS EN 1634-1, ensuring full compliance with BNBC requirements. Developers and architects should consult the BNBC 2020 document and local Sylhet fire department guidelines to confirm the exact rating needed for their specific occupancy classification and building height.
Antifires ensures its fire-rated glass withstands Sylhet’s monsoon humidity and heat through the use of laminated ceramic interlayers combined with edge sealants tested to ISO 9227 salt-spray resistance standards. This construction prevents moisture ingress and fogging between glass layers, a common issue in tropical climates. The glass structures, such as the 21mm FPOS and 28mm EI60 panels, incorporate multi-layer designs with intumescent gels that remain stable under high humidity and temperature variations. Additionally, the frame systems utilize ceramic wool seals (density 210 kg/m³) and intumescent fire seals (20mm × 4mm) that maintain their fire-resistant properties even after prolonged exposure to Sylhet’s environmental conditions. These assemblies have been tested in ambient conditions ranging from 27°C to 36°C and relative humidity levels between 43% and 90%, replicating the real-world climate challenges of Sylhet. This ensures long-term durability and consistent fire performance throughout the product’s lifecycle.
Yes, Antifires offers both remote and on-site technical support for Sylhet projects, including comprehensive installation guidance per NFPA 80 and BNBC 2020. This support covers critical aspects such as frame fixing schedules (M6/M8 anchor bolts at 300–600mm spacing), expansion gap management (3mm–5mm filled with ceramic fiber), and proper sealant application using ceramic wool and intumescent seals. Antifires’ team can review project-specific shop drawings and installation plans to ensure alignment with local code requirements and manufacturer specifications. For complex installations, such as those in high-rise towers or healthcare facilities, on-site visits can be arranged to verify that the glazing systems are installed correctly, maintaining the certified fire resistance ratings. This level of support helps Sylhet developers and contractors avoid common installation errors that could compromise fire performance, ensuring that the passive fire protection system performs as intended during a fire event.