Industrial Exhaust Fans

Product Overview

Industrial exhaust fans remove contaminated air, excess heat, and airborne particulates from large-scale interior spaces. Engineered for continuous duty cycles in harsh environments, these units balance high volumetric airflow against strict static pressure thresholds. Units integrate precision-balanced blades with totally enclosed fan-cooled (TEFC) motors to operate reliably in ambient temperatures ranging from -20°C to +60°C.

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Key Features

Direct-Drive & Belt-Drive Configurations: Direct-drive units eliminate transmission losses and belt maintenance; belt-drive models allow on-site speed adjustments and isolate the motor from airstream contaminants.

Corrosion-Resistant Housing: Constructed from hot-dip galvanized steel, heavy-gauge aluminum, or optional Grade 304/316 stainless steel to withstand chemical vapors and high humidity.

Aerodynamic Impeller Design: Forward-curved or airfoil blades dynamically balanced to ISO 1940 Grade G6.3 standards, minimizing turbulence and mechanical vibration.

IP55 / IP56 Motor Enclosures: Standard motors feature class F insulation, thermal overload protection, and dust-tight, water-jet-resistant protection.

Automated Shutter Integration: Gravity-operated or centrifugal shutter dampers prevent backdrafts and weather ingress when the fan is de-energized.

Technical Specifications

Model Series	Airflow Capacity (CFM)	Static Pressure (Pa)	Fan Speed (RPM)	Motor Power (HP / kW)	Noise Level (dB(A))	Operating Voltage
IEF-300	8,500 – 12,000	50 – 150	1,450	1.0 HP / 0.75 kW	65	220V/380V, 50Hz/60Hz, 3Ph
IEF-400	15,000 – 22,500	80 – 200	960	2.0 HP / 1.5 kW	68	380V/460V, 50Hz/60Hz, 3Ph
IEF-500	28,000 – 38,500	100 – 300	720	5.0 HP / 3.7 kW	72	380V/460V, 50Hz/60Hz, 3Ph
IEF-600	42,000 – 55,000	150 – 350	580	7.5 HP / 5.5 kW	75	480V, 60Hz, 3Ph

Construction & Working Principle

The fan housing utilizes laser-cut sheet metal assembled via continuous seam welding to ensure structural rigidity under negative pressure. Impellers are press-fitted onto precision-machined shafts supported by heavy-duty cast-iron pillow block bearings rated for L10 nominal life exceeding 50,000 hours.

Working Principle: Electric motor rotation drives the multi-blade impeller, creating a low-pressure zone at the intake side. Air enters axially across the blade surface, where kinetic energy converts into directional velocity. Centrifugal or axial force propels air through the discharge vent, displacing stale interior air and drawing fresh air through makeup air units or louvered wall inlets.

Applications

01/

Manufacturing & Assembly Plants: Expels welding fumes, heat buildup from machinery, and cutting oil mist.

02/

Warehouses & Logistics Centers: Prevents thermal stratification and maintains occupational temperature thresholds during summer months.

03/

Chemical & Processing Facilities: Handles corrosive exhaust streams using specialized acid-resistant coatings and spark-resistant aluminum-bronze tip blades.

04/

Agricultural Livestock Housing: Removes ammonia, carbon dioxide, and excess moisture from poultry and swine facilities.

Available Options

Blade Materials

Cast aluminum, stainless steel (304/316), or Glass-Reinforced Plastic (FRP) for highly corrosive airstreams.

Motor Variants

Explosion-proof motors (Class I, Division 1 / ATEX certified), dual-speed windings, and inverter-duty (VFD compatible) motors.

Coating Systems

Epoxy powder coating (minimum 120-micron thickness) or hot-dip galvanizing post-fabrication.

Accessories

Wall mounting sleeves, bird screens, security guards, and gravity shutter actuators.

Manufacturing & Quality

Production occurs in a 25,000-square-meter facility operating Trumpf CNC fiber laser cutters, OTC automated robotic welding cells, and dynamic balancing rigs capable of handling 2-meter diameter impellers.

Quality Control Protocols:
Raw material spectral analysis verified via PMI (Positive Material Identification) testing prior to shearing.
Welds inspected using liquid penetrant testing (PT) on pressure-bearing structural joints.
Every completed fan assembly undergoes a 2-hour running test on a dynamometer test bench to measure vibration velocity (mm/s RMS), operating current, and electrical insulation resistance (>100 MΩ at 1000V).

Certifications: ISO 9001:2015 quality management system, CE safety compliance, and AMCA standard air performance verification protocols.

FAQ

Q: What is the difference between direct-drive and belt-drive models for high-dust environments?

A: Direct-drive fans seal the motor against airborne particulates, requiring minimal maintenance in dusty zones like grain silos. Belt-drive fans position the motor outside the airstream, preventing combustible or abrasive dust from accumulating on motor windings, though belts require periodic tension checks.

Q: How do I calculate the required CFM for my facility?

A: Multiply the total volume of the building in cubic feet by the required air changes per hour (ACH) based on your application, then divide by 60. For example, a 100,000 cubic foot warehouse requiring 10 ACH needs a minimum of (100,000 × 10) / 60 = 16,667 CFM of total exhaust capacity.

Q: Can these exhaust fans operate with variable frequency drives (VFDs)?

A: Yes. When paired with inverter-duty motors (rated for NEMA MG1 Part 31), fan speed adjusts dynamically to match real-time indoor air quality sensors or fluctuating production loads, reducing energy consumption.

Q: What noise reduction measures are available for urban commercial installations?

A: Optional downstream silencers (sound attenuators), vibration isolator spring mounts, and low-RPM large-diameter blade configurations lower sound pressure levels by 8 to 15 dB(A).

Q: What level of corrosion protection is recommended for coastal or chemical plant installations?

A: Grade 304 or 316 stainless steel construction combined with a marine-grade epoxy coating protects against salt spray and acidic chemical degradation, extending operational lifespan beyond standard galvanized units.

Q: What warranty coverage and replacement part availability do you provide?

A: Assemblies carry a 2-year standard warranty against manufacturing defects. Critical replacement components—including motors, bearings, and impellers—maintain stock availability for dispatch within 48 hours.

Request a Quote

To receive a formal quotation, specify your operating parameters:
Required Airflow (CFM or m³/h) and Static Pressure (Pa)
Available Electrical Power Supply (Voltage / Phase / Frequency)
Airstream Characteristics (Temperature, Moisture, Corrosive Chemicals, Dust Load)
Installation Environment (Wall-mounted, Roof-mounted, Duct connection)

With abundant experience, we are one of the most reliable industrial exhaust fans manufacturers and suppliers in China. Please feel free to wholesale high quality industrial exhaust fans made in China here from our factory. We also accept customized orders.