Heavy-duty centrifugal exhaust fan engineered for continuous industrial duty, high static pressure resistance, and variable air volume management. Designed for direct integration into facility ventilation, industrial process exhaust, and material handling systems. Built around precision-balanced backward-curved or radial impellers to maintain stable aerodynamic performance across fluctuating system resistance.

Key Features

Aerodynamic Impeller Design: Backward-curved blades deliver high static efficiency and non-overloading power characteristics, preventing motor burnout during variable pressure drops.

Rigid Structural Housing: Heavy-gauge carbon steel or stainless steel scroll casing with continuous MIG/TIG welding to withstand operational vibration and thermal expansion.

Precision Dynamic Balancing: Impellers dynamically balanced to ISO 1940 Grade 2.5 standards, minimizing mechanical vibration and extending bearing service life.

Direct or Belt-Driven Configurations: Flexibility to match motor speeds with specific duty points, optimizing energy consumption and sound output.

Thermal and Corrosion Protection: Available with high-temperature shaft seals and specialized chemical-resistant powder coatings for aggressive exhaust environments.

Technical Specifications & Engineering Data

Parameter	Standard Range / Metric
Airflow Capacity (CFM / m3/h)	1,000 -- 50,000 CFM (1,700 -- 85,000 m3/h)
Static Pressure	Up to 3,000 Pa (12 in.wg)
Impeller Diameter	300 -- 1,400 mm
Operating Temperature	-20°C to +250°C (higher temp options available)
Motor Power	0.75 kW to 160 kW (IE3 / IE4 efficiency)
Housing Material	Q235 Carbon Steel, SS304, SS316L, Galvanized Steel
Drive Arrangement	Arrangement 1, 4, 9 (Direct drive or V-belt drive)
Certifications	CE, ISO 9001, AMCA certified performance (optional)

Construction & Working Principle

Working Principle

Air enters axially through the fan inlet and is drawn into the center of the rotating impeller. Centrifugal force accelerates the air outward along the blade channels, increasing both velocity and static pressure. The scroll-shaped housing collects the high-velocity air stream, converting kinetic energy into static pressure before discharging it through the exhaust ductwork.

Construction Details

Casing: Formed from heavy-gauge plate steel with reinforced structural stiffeners to prevent shell flexing at high static pressures. Flanged inlets and outlets drilled to match standard duct dimensions.

Shaft & Bearings: Precision-machined alloy steel shafts supported by heavy-duty self-aligning pillow block roller bearings rated for L10 life exceeding 40,000 hours.

Inlet Cone: Venturi-profiled inlet bell designed to minimize entry turbulence and maximize volume flow efficiency.

Applications

Industrial Ventilation: Heat extraction, moisture removal, and general air exchange in manufacturing plants, foundries, and warehouses.

Process Exhaust: Capturing and routing corrosive vapors, welding smoke, and chemical fumes in metal fabrication and chemical processing facilities.

Dust & Particle Handling: Integrating into baghouse filtration systems and cyclone separators for woodworking, cement, and grain processing.

Commercial HVAC: Large-scale commercial kitchen ventilation, data center heat rejection, and building pressurization loops.

Available Options

Material Upgrades: Construction using SS304/SS316L for acid/alkali resistance, or abrasion-resistant AR400 steel for particulate-laden air streams.

Spark-Resistant Construction (AMCA Type B/C): Aluminum or bronze inlet rings and non-ferrous housings for explosive or flammable gas environments (ATEX compliant configurations).

Acoustic Enclosures: Factory-engineered weather-proof sound attenuators reducing overall operating noise by 10 to 18 dB(A).

Variable Frequency Drive (VFD) Compatibility: Pre-wired inverter-duty motors for precise air volume modulation.

Accessories: Inlet dampers, flexible connectors, vibration isolators (spring or rubber mounts), and shaft inspection doors.

Manufacturing & Quality Control

Production relies on automated CNC plasma cutting, precision laser welding, and dynamic balancing test benches to maintain strict manufacturing tolerances.

Sheet Metal Processing: CNC laser and plasma cutting systems ensure dimensional accuracy within ±0.2 mm for housing scroll plates and blade assemblies.

Welding Quality: Certified welders perform continuous penetration welds on all structural load-bearing seams, followed by non-destructive weld inspection (NDT) upon request.

Balancing & Run-Test: Every assembled rotating assembly undergoes computerized dynamic balancing at operational speeds, followed by a 2-hour full-load electrical and thermal run test prior to packaging.

Surface Treatment: Components undergo grit-blasting to Sa 2.5 bare metal standard before applying industrial-grade epoxy or polyurethane powder coatings, ensuring salt-spray resistance exceeding 500 hours.

FAQ

Q: How do I select the correct static pressure rating for my duct network?

A: Calculate total system resistance by summing friction losses in straight duct runs, fitting losses (elbows, transitions), and pressure drops across filtration units or scrubbers at your required design airflow rate (CFM). Choose a fan curve that intersects your duty point on the stable right-hand side of the peak pressure curve.

Q: What is the difference between direct drive and belt-driven configurations?

A: Direct-drive fans couple the impeller directly to the motor shaft, resulting in higher mechanical efficiency, zero belt slip, and minimal maintenance. Belt-driven configurations allow speed adjustments via pulley ratios, making them adaptable if system airflow requirements change post-installation.

Q: Can this fan handle corrosive or moisture-laden exhaust gases?

A: Yes. For corrosive environments, specify SS304 or SS316L material construction and chemically resistant coatings. For high-humidity or moisture-heavy air streams, specify drain plugs in the scroll housing bottom and shaft seal arrangements to protect motor bearings.

Q: Are these fans compliant with ATEX or spark-resistant standards?

A: Spark-resistant construction compliant with AMCA guidelines (using non-sparking materials like aluminum inlet rings against steel impellers) is available upon request for classified hazardous locations.

Q: What is the standard lead time for custom-engineered specifications?

A: Standard catalog configurations ship within 3 to 4 weeks. Custom-engineered units requiring specialized materials, explosion-proof motors, or specific flange dimensions typically require 5 to 7 weeks depending on material availability.

Q: What documentation is provided with shipment?

A: Each unit ships with a complete technical data package including certified dimension drawings, electrical wiring diagrams, dynamic balancing test reports, maintenance manuals, and material mill test certificates (MTC).

Request a Quote

To receive a detailed technical proposal, performance curve verification, and commercial quotation, submit your project specifications to our engineering team:

Required Airflow Volume (CFM or m3/h)
Total Static Pressure (Pa or in.wg)
Gas Medium Characteristics (Temperature, density, moisture, or chemical concentration)
Power Supply Availability (Voltage, Phase, Frequency)
Required Options, CAD Format, or Standards Compliance

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