For projects in Henglizhen, Dongguan, here are the fire shutter specifications and capabilities from Heruihua.
Steel Fire Shutters
Fire rating: 3 hours (A-class) or 4 hours (super A-class), depending on model and configuration.
Curtain: Cold-rolled steel composite slats, 1.2mm front face, 1.0mm back face, with intumescent or rock wool insulation filling. Slats are interconnected with hook-and-eye joints allowing some flexibility.
Size capability: Width up to 18 meters across a single opening or in sections. Height up to 8 meters per door. For larger openings, multiple doors in series with overlapping coverage.
Guide rails: Galvanized steel, minimum 2.0mm thickness for standard, 3.0mm for special-grade. Rail depth: 110mm standard, up to 180mm for special-grade.
Motor: Fire-rated motor with manual chain override and thermal protection. Power supply: 380V three-phase for larger doors, 220V single-phase for smaller doors. Motor power ranges from 0.75kW to 3.0kW depending on door size and weight.
Inorganic Fabric Fire Shutters (Special-Grade)
Fire rating: Up to 4 hours.
Curtain: Multi-layer. Glass fiber base fabric, ceramic fiber blanket, aluminum foil radiation shield, silicone-coated outer fabric. All layers sewn with high-temperature resistant thread (aramid or PTFE). Thickness: 8 to 12mm total.
Size capability: Single span up to 30 meters wide, 10 meters high. Because the curtain is light, large spans are feasible without intermediate support.
Control System for Both Types
Control box with fire alarm interface. Accepts normally-open or normally-closed dry contact signals. Provides open and closed position feedback signals (dry contacts). Battery backup for 24V DC control circuit, capable of one complete cycle.
Two-step descent logic. First signal: descend to 1.8 meters. Second signal: full descent. Adjustable timers for both steps.
Manual operation: Manual chain for powered operation when control fails. Quick-release handle for gravity descent. Fusible link release set at 68 degrees Celsius.
All products come with fire rating test reports from recognized labs. Contact 18926001238 for specifications and pricing for Henglizhen projects.