Centrifugal Roof Exhaust Fan

Backward-Inclined Centrifugal Wheel: Non-overloading aerodynamic blade design maintains stable airflow performance against changing system static pressures.

Vibration Isolation System: Heavy-duty rubber isolators decouple the motor and drive assembly from the base, dampening mechanical harmonics and lowering sound levels.

Precision-Balanced Rotating Assembly: Dynamically balanced to ISO 1940 Grade G6.3 standards, reducing bearing wear and extending operational life.

Weathertight Aluminum/Galvanized Hood: Spun aluminum or heavy-gauge galvanized steel top cap with bird screen prevents rain, snow, and debris ingress while discharging exhaust upward away from the roof surface.

Removable Access Panels: Quick-release latches allow direct maintenance access to the motor, belt, and bearings without removing the entire fan housing from the roof curb.

Housing Assembly: Formed from corrosion-resistant galvanized steel or marine-grade aluminum, joined by structural spot-welding and mechanical fasteners sealed against moisture ingress.

Drive Mechanism: Direct-drive models couple the wheel directly to the motor shaft. Belt-drive models utilize cast-iron adjustable pulleys and heavy-duty matched V-belts rated for 25,000+ hours of continuous operation.

Bearings: Pillow block ball bearings rated for L10 life exceeding 100,000 hours under maximum load conditions.

Working Principle: Rotation of the backward-inclined centrifugal wheel draws air upward through the roof curb. Centrifugal force accelerates the air radially outward, converting velocity pressure into static pressure within the scroll housing, and exhausting the air vertically out through the discharge cap.

Manufacturing Plants & Warehouses: Removes trapped heat, welding fumes, and industrial process gases from large open-bay facilities.

Commercial Kitchens: Utilizes grease-rated configurations (UL 705 / UL 762 compliant) to exhaust high-temperature cooking vapors.

Data Rooms & Server Facilities: Provides continuous heat rejection exhaust to maintain stable ambient operating temperatures.

Educational & Institutional Buildings: Operates continuously on school gymnasiums, locker rooms, and laboratories to maintain air exchange compliance.

Motors: TEFC (Totally Enclosed Fan Cooled) for dusty environments; Explosion-proof motors (Class I, Div 1/2) for hazardous vapor extraction.

Coatings: Epoxy powder coat, Heresite corrosion-resistant coating, or full marine-grade treatment for coastal installations.

Discharge Configurations: Upblast (standard for grease/fumes) and Sidewall discharge options.

Accessories: Factory-fabricated roof curbs, burglar bars, bird screens, gravity or motorized backdraft dampers, and disconnect switches mounted and wired.

Sheet Metal Fabrication: Automated CNC laser cutting and CNC turret punching ensure dimensional tolerances within +/-0.1 mm for housing components.

Welding & Assembly: Certified structural welding performed in compliance with AWS D1.1 standards for stress-bearing frame assemblies.

Balancing Protocol: Every fan wheel and motor assembly undergoes rigid two-plane dynamic balancing on computerized balancing rigs prior to final assembly.

End-of-Line Testing: 100% of manufactured units undergo automated run-testing under nominal voltage to verify amp draw, vibration amplitude limits, and RPM consistency before crating.

Provide your project requirements below to receive a formal technical submittal, 2D/3D CAD/BIM files, and volume pricing within one business day.

Required Parameters: Target CFM, Static Pressure (in. wg), Voltage/Phase, Roof Curb Size, Quantity.

Contact Channel: Submit specifications directly to our engineering sales desk at or complete the RFQ form below.