Heavy-duty industrial exhaust fan engineered for continuous operation in high-heat, particulate-laden, and corrosive environments. Designed for wall or roof mounting, this unit provides high-volume air exchange to remove stagnant air, industrial fumes, excess heat, and airborne dust from large commercial and manufacturing facilities. Built around a rigid galvanized or stainless steel structural frame and direct-drive or belt-drive motor configurations, it sustains rated airflow against building static pressure resistance.

Key Features

High Airflow-to-Power Efficiency: Optimized blade aerodynamic profile minimizes turbulence, delivering high CFM output per watt consumed.

Corrosion-Resistant Housing: Heavy-gauge hot-dip galvanized steel or optional Grade 304/316 stainless steel construction prevents oxidation in humid or chemically aggressive atmospheres.

Balanced Impeller Assembly: Dynamic balancing of multi-blade fans reduces mechanical vibration, lowering acoustic output and extending bearing service life.

Automatic Shutter Integration: Gravity-operated or motorized shutters seal tight when inactive, preventing backdrafts, weather intrusion, and heat loss.

Sealed Motor Protection: Totally Enclosed Fan-Cooled (TEFC) motors rated at IP55 or higher, featuring Class F insulation and thermal overload protection for continuous duty cycles.

Technical Specifications

Parameter	Standard Range / Specification
Airflow Capacity	8,500 CFM to 45,000 CFM (14,400 m3/h to 76,500 m3/h)
Static Pressure	0 to 150 Pa
Fan Diameter	600 mm to 1,500 mm (24 inches to 59 inches)
Motor Power	0.37 kW to 5.5 kW (0.5 HP to 7.5 HP)
Electrical Supply	380V-480V / 3-phase / 50Hz or 60Hz (Custom voltages available)
Blade Material	Cast aluminum alloy, FRP (Fiberglass Reinforced Plastic), or mirror-finish stainless steel
Noise Level	65 dB(A) to 78 dB(A) measured at 3 meters
Ambient Operating Temp	-20C to +60C (High-temp variants up to 100C available)

Construction & Working Principle

Air movement relies on an axial flow mechanism driven by a direct-coupled or V-belt transmission motor.

Structural Framework: The exterior housing utilizes pressed steel panels folded with CNC turret punch presses, joined by structural rivets and corrosion-resistant fasteners to eliminate flex under load.

Impeller Assembly: Blades are laser-cut from high-strength plate stock or precision-cast as single-piece aluminum units. Each impeller undergoes dynamic balancing on computerized balancing rigs to ISO 1940 Grade G6.3 standards prior to final assembly.

Drive Configuration: Direct-drive units eliminate belt slip and maintenance requirements, pairing the motor shaft directly to the blade hub. Belt-drive units utilize cast-iron pulleys and matched V-belts, allowing speed adjustments on-site to fine-tune airflow rates.

Applications

Heavy Manufacturing & Foundries: Extraction of welding fumes, metal processing heat, and oil mist.

Warehousing & Logistics Centers: Thermal destratification and general fresh-air exchange in large cubic-capacity buildings.

Agricultural Facilities: Ammonia and moisture removal in large-scale livestock barns and greenhouses.

Chemical & Processing Plants: Continuous ventilation in non-explosion-proof utility areas requiring continuous air turnover.

Available Options

Materials: Upgrade from standard galvanized steel (Z275 coating) to SS304 or SS316 for marine or corrosive chemical exposure.

Motors: Explosion-proof motors (ATEX / Exd IIBT4 certified) for hazardous environments containing flammable vapors or combustible dust.

Shutters: Centrifugal open-mechanism shutters or positive-pressure motorized actuators.

Inlet/Outlet Guards: OSHA-compliant wire safety mesh guards on intake and discharge sides.

Speed Control: VFD (Variable Frequency Drive) compatible motor windings for adjustable ventilation loads.

Manufacturing & Quality Control

Production relies on standardized fabrication and testing protocols to ensure mechanical reliability and consistent performance:

Sheet Metal Processing: CNC fiber laser cutting and CNC hydraulic bending machines maintain dimensional tolerances within +/-0.2 mm for housing components.

Welding Standards: Robotic MIG welding ensures uniform penetration and structural integrity on frame joints, inspected via visual weld checks.

Component Testing: Incoming electric motors undergo no-load current draw and insulation resistance testing.

Performance Testing: Completed fans undergo running tests in an in-house wind tunnel test rig conforming to AMCA 210 standards, verifying static pressure, airflow velocity, power consumption, and vibration amplitudes before packaging.

Certifications: ISO 9001 quality management system certified manufacturing facility; CE compliant electrical assemblies.

FAQ

Q: What is the difference between direct-drive and belt-drive exhaust fans for industrial use?

A: Direct-drive fans couple the impeller directly to the motor shaft, resulting in zero transmission loss, fewer wearable parts, and lower ongoing maintenance. Belt-drive fans use pulleys and belts, which allow for easier CFM adjustments by changing pulley ratios and isolate the motor from the direct airstream, making them suitable for high-temperature or moisture-heavy applications.

Q: How do I calculate the required fan capacity (CFM) for my facility?

A: Calculate the total room volume in cubic feet (Length x Width x Height) and multiply by the desired Air Changes per Hour (ACH) recommended for your specific application-typically 15 to 30 changes per hour for manufacturing plants-then divide by 60 to determine required CFM. Consult our engineering team with your building dimensions for a precise CFD-backed calculation.

Q: Can these exhaust fans operate against external static duct resistance?

A: Standard axial exhaust fans are optimized for through-the-wall exhaust with minimal ductwork (low static pressure up to 50 Pa). If your application requires duct runs, elbows, or filtration media, specify this during inquiry so we can configure higher-pressure airfoil impellers or centrifugal fan alternatives.

Q: Are explosion-proof variants available for hazardous chemical zones?

A: Yes. We supply configurations equipped with ATEX/IECEx certified explosion-proof motors, non-sparking aluminum/copper inlet rings, and static-conductive coatings to prevent electrostatic discharge in explosive atmospheres.

Q: What is the standard lead time for bulk orders and custom specifications?

A: Standard models in common electrical configurations (380V/50Hz or 460V/60Hz) ship within 15 to 20 business days. Custom voltage, material upgrades (SS316), or high-temperature builds require 25 to 35 business days depending on production scheduling.

Q: What warranty coverage and spare parts support are provided?

A: We provide a 12-month standard warranty covering manufacturing defects and motor failure under normal operating conditions. Critical replacement components-including motors, replacement blades, bearings, and shutter assemblies-are stocked for rapid global dispatch.