Fire Rated Exhaust Fan
Product Overview
Fire-rated exhaust fans are engineered ventilation units designed to extract high-temperature smoke, toxic gases, and grease-laden air while maintaining structural and operational integrity during building fires. Drawing from actual manufacturing shop-floor production data and field deployment experience, these units integrate thermal-actuated dampers, heavy-gauge steel housings, and high-temperature-rated motors capable of continuous operation at elevated temperatures (300°C to 400°C for 2 hours) complying with international life-safety and regional building codes across North American, European, and Middle Eastern markets. They serve as critical life-safety components in commercial and industrial infrastructure to maintain egress visibility and prevent structural flashover.
Types & Configurations
Inline Centrifugal Fire Exhaust Fans
Installed within rectangular or circular ductwork runs; suitable for mid-to-high static pressure applications in tight ceiling plenums.
Roof-Mounted Upblast Exhaust Fans
Discharges exhaust vertically away from the roofline; deployed extensively in commercial kitchen grease-extraction networks.
Cabinet-Housed Utility Fans
Enclosed in acoustically insulated panels for indoor mechanical room placement; utilizes belt-driven centrifugal blowers for large volumetric air movement.
Wall-Mounted Propeller / Exhaust Units
Direct-drive setups built into exterior walls for general industrial thermal relief with automatic fire shutters.
Working Principle & Materials Construction
Thermal Actuation
Integrated fusible links calibrated to melt at specific threshold temperatures (e.g., 74°C or 100°C) release spring-loaded dampers instantly if exhaust gas exceeds safe operational limits, preventing fire migration through duct networks.
Housing
Minimum 1.6mm gauge galvanized steel or continuous-weld heavy carbon steel, treated with anti-corrosive epoxy powder coating rated to 200°C continuous exposure.
Impeller
Backward-curved centrifugal wheels statically and dynamically balanced to ISO 1940 Grade 2.5, fabricated from heavy-gauge steel or cast aluminum to resist warping under thermal stress.
Motor & Bearings
Totally Enclosed Fan-Cooled (TEFC) motors with Class H insulation and continuous-duty ratings. Sealed pillow-block bearings rated for high radial loads and operational ambient temperatures up to 400°C.
High-temperature motor endurance rated for continuous operation at 300°C / 120 minutes.
Heavy-duty thermal fuse damper linkage with mechanical lock-open/shut positioning.
Leakage-rated damper blades fitted with high-density ceramic fiber edge seals.
Vibration isolation spring assemblies dampening structural harmonic feedback.
External grease drain connection points (on kitchen duty models) welded directly to the scroll housing lowest point.
Commercial kitchen ventilation hoods requiring strict grease-extraction compliance.
High-rise building stairwell pressurization and smoke containment shafts.
Underground parking garage carbon monoxide and emergency smoke purge systems.
Industrial chemical storage rooms and manufacturing heat-treating zones.
Technical Specifications
|
Parameter |
Specification Range |
Reference Standard |
|
Airflow Capacity |
1,200 to 45,000 CFM (2,000 to 76,500 m3/h) |
Air Movement Performance |
|
Static Pressure |
0 to 1,250 Pa (0 to 5 in. WG) |
Pressure Differential Testing |
|
Temperature Resistance |
300°C / 400°C for 120 minutes |
High-Temperature Smoke Endurance |
|
Voltage / Frequency |
208V to 480V, 3-Phase, 50Hz / 60Hz (Multi-voltage compatibility) |
Electrical Safety Codes |
|
Housing Thickness |
1.6 mm to 3.0 mm structural steel |
Material Gauge Specification |
|
Motor Protection |
IP55 / IP56 ingress rating, Class H winding |
Ingress Protection & Insulation |
Manufacturing & Quality Control
Laser Cutting & CNC Bending: Advanced CNC laser cutters and press brakes maintain dimensional tolerances within +/-0.1 mm for airtight housing assembly.
Welding Standards: MIG and TIG structural welding executed by certified structural welding technicians to ensure zero weld distortion under thermal cycling.
Dynamic Balancing: Every completed wheel and motor assembly undergoes multi-plane dynamic balancing on computerized balancing rigs to limit vibration velocity below 1.5 mm/s.
Factory Testing & Quality Management: 100 percent operational run-test measuring current draw, voltage, RPM, and vibration spectrum prior to crating. Production facilities operate under strict quality management frameworks, with independent third-party test verification reports available for engineering submittal reviews.
Customization & OEM
Custom duct flange dimensions and drilling patterns tailored to project blueprints.
Special metallurgy options including Grade 304 or 316 stainless steel housings for marine or corrosive chemical environments.
Dual-speed motor windings for combined daily ventilation and emergency smoke extraction operation.
Integrated variable frequency drive (VFD) compatible wiring harnesses and pre-wired weatherproof junction boxes.
Frequently Asked Questions
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