Overview
Galvanized steel fireproof duct board is a composite material engineered for fire safety in ventilation systems. It consists of a galvanized steel core layered with fire-retardant materials such as intumescent coatings or mineral wool. This construction allows it to withstand high temperatures while preventing flame propagation through ducts. Widely specified in commercial kitchens, hospitals, and high-rises, these boards meet international standards like ASTM E84 and EN 13501. Their installation helps compartmentalize fires, a critical feature in modern passive fire protection strategies.
Structure and Working Principle
The board typically features a 0.5-1.2mm galvanized steel exterior that provides structural support and corrosion resistance. The fireproofing layer varies from 5-30mm thick, often using endothermic materials that absorb heat or expand when exposed to flames. During a fire, the coating swells or releases water vapor to create an insulating barrier, maintaining duct integrity below 400°C for rated durations. Some advanced versions incorporate ceramic fibers that reflect radiant heat, enhancing performance in extreme conditions.
Key Features
Modern fireproof duct boards offer Class A fire ratings (flame spread index ≤25) while remaining lightweight (8-15 kg/m²). Their galvanized base resists humidity and chemical corrosion better than standard steel, extending service life in harsh environments. Manufacturers achieve UL/CE certifications by testing full duct assemblies, not just materials. Top-tier products maintain air tightness during fires—a crucial factor for smoke control systems. Some variants include pre-applied acoustic insulation, combining fire and noise protection.
Application Areas
Primary applications include smoke extraction systems in airports and tunnels, where ducts must remain functional during emergencies. They're mandatory in vertical shaft penetrations between floors to prevent stack effect fire spread. Industrial facilities use them for fume exhaust ducts near high-temperature processes. In retrofit projects, fireproof boards often wrap existing ducts where space constraints prevent conventional fireproofing methods.
Maintenance and Precautions
Routine inspections should check for coating delamination or steel corrosion, especially in humid climates. Only UL-listed sealants should repair joints to maintain fire ratings. Never drill or modify installed boards without consulting the manufacturer. During installation, use non-combustible fasteners spaced per engineering specs. Maintain minimum 50mm clearance from electrical conduits to prevent heat transfer. Always store boards flat to prevent warping before use.
B2B Procurement Guide
When sourcing, request third-party test reports for both material samples and complete duct assemblies. Verify certifications match your project's jurisdiction (e.g., NFPA 90A in the US). Leading manufacturers include Kingspan, Promat, and Unifrax. Bulk orders (500+ m²) typically gain 10-15% discounts. Consider lead times—custom fire ratings may require 4-6 weeks production. For cost-sensitive projects, compare prefabricated panels versus field-applied fireproofing systems over standard ducts.
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