Fume & Smoke Exhaust Fans

Product Overview

Heavy-duty exhaust units built for continuous extraction of corrosive fumes, hazardous process gases, and high-temperature smoke. Engineered for industrial process ventilation and life-safety systems requiring continuous operation under severe static pressure loads. Standard configurations handle operating temperatures up to 300 deg C for 2 hours during smoke clearance emergencies, utilizing direct-drive or belt-drive assemblies housed in heavy-gauge welded steel or corrosion-resistant polymer coatings.

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High Temperature Smoke Exhaust Fan
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Key Features

01/

High-Temperature Structural Integrity: Welded carbon or stainless steel housings maintain structural dimensional stability without thermal warping under sustained gas streams up to 400 deg C.

02/

Vibration-Isolated Drive Assembly: Precision dynamically balanced impellers (ISO 1940 Grade G2.5) mounted on heavy-duty pillow block bearings minimize mechanical vibration across variable frequency drive (VFD) operating ranges.

03/

Corrosion-Resistant Wet Sections: Internal airstream surfaces protected by multi-layer epoxy powder coats, fusion-bonded epoxy linings, or solid Grade 316 stainless steel construction for chemical plant environments.

04/

Explosion-Proof Configurations: Available with spark-resistant airstream construction (AMCA Type B/C) and Division 1 or Division 2 explosion-proof motor ratings for hazardous classified locations.

Technical Specifications

Parameter	Standard Range / Specification
Airflow Capacity (Q)	1,000 to 120,000 CFM (1,700 to 204,000 m3/h)
Static Pressure (Delta Ps)	Up to 3,500 Pa (14 in. w.g.)
Operating Temperature	-20 deg C to 300 deg C (Continuous); up to 400 deg C / 2 h (Emergency Smoke)
Impeller Material	Q235 Carbon Steel, 304/316 Stainless Steel, Cast Aluminum
Housing Thickness	4 mm to 12 mm heavy-gauge structural plate
Motor Power	0.75 kW to 250 kW (IE3/IE4 efficiency ratings available)
Electrical Protection	IP55 / IP56; Explosion-proof Ex d IIB T4 / Class I, Div 1

Construction & Working Principle

The fan utilizes a centrifugal backward-curved or radial blade geometry designed to convert mechanical rotational energy into static pressure and velocity.

Housing

Continuously welded scroll housings eliminate air leakage, fabricated from hot-rolled carbon steel plates reinforced with structural angle ribs to withstand high duct system resistance.

Impeller

Backward-inclined non-overloading blades reduce motor power draw as system resistance drops, preventing motor thermal overload if duct access doors are open.

Shaft & Bearings

Precision-machined 42CrMo alloy steel shafts coupled with self-aligning spherical roller bearings rated for a minimum L10 bearing life of 100,000 hours.

Applications

Metal Fabrication & Welding: Source capture and general plant extraction of welding fumes, hexavalent chromium, and grinding dust.

Chemical & Pharmaceutical Processing: Exhaust of acid mists, solvent vapors, and corrosive process gases requiring sealed airstreams.

Commercial Kitchen Ventilation: Removal of high-temperature grease-laden vapors and smoke from commercial cooking lines.

Life Safety & Infrastructure: Stairwell pressurization and emergency smoke evacuation systems in transit tunnels, high-rise buildings, and industrial complexes.

Available Options

Drive Arrangements: Arrangement 4 (direct drive, motor on wheel), Arrangement 9 (belt drive with motor mounted on side base), and Arrangement 1 (belt drive with independent pedestal).

Shaft Seals: Shaft cooling wheels for high-temperature service; labyrinth seals and PTFE stuffing box gas-tight shaft seals for hazardous chemical vapors.

Airstream Coatings: Halar (ECTFE) coatings, rubber linings, and acid-resistant ceramic topcoats for aggressive chemical resistance.

Accessories: Inlet/outlet flexible connectors, companion flanges, bird screens, drain plugs, inspection access doors, and vibration sensor mounting pads.

Manufacturing & Quality Control

Manufacturing processes utilize CNC laser cutting, automated plasma welding, and dynamic balancing test rigs to ensure strict dimensional repeatability and mechanical reliability.

Plate Cutting & Forming

Trumpf CNC fiber lasers cut housing plates to tight tolerances (+/- 0.1 mm), followed by automated hydraulic press brakes for precise scroll forming.

Welding Standards

All structural and pressure-retaining welds are executed by AWS/EN certified welders using MIG/TIG processes, subject to visual inspection and non-destructive testing (NDT) via dye penetrant upon request.

Dynamic Balancing

Every completed rotating assembly undergoes two-plane electronic dynamic balancing on Schenck balancing machines to reduce residual unbalance below ISO 1940 Grade G2.5 thresholds prior to final casing assembly.

Performance Testing

Completed fan assemblies are test-run on integrated dynamometer stands to record operational amperage, vibration velocity spectra, and bearing operating temperatures.

Compliance Standards

Units are engineered in accordance with AMCA 210 (Air Performance) and AMCA 300 (Sound Performance) test standards, with electrical motors conforming to IEC, NEMA, and ATEX/UL hazardous location specifications.

FAQ

Q: What is the maximum continuous operating temperature for standard models?

A: Standard configurations operate continuously at temperatures up to 80 deg C. High-temperature models with thermal barrier shafts and cooling impellers handle continuous gas streams up to 300 deg C, and emergency smoke models withstand 400 deg C for 2 hours.

Q: How do you prevent corrosion when exhausting chemical acid mists?

A: Airstreams exposed to corrosive agents utilize solid Grade 316 stainless steel or carbon steel housings protected by baked Halar (ECTFE) or fusion-bonded epoxy linings, paired with shaft seals to prevent gas migration into the bearing housing.

Q: Are these fans certified for hazardous or explosive environments?

A: Yes. Units destined for classified locations incorporate spark-resistant AMCA Type B airstream construction (aluminum or bronze inlet cones) combined with ATEX-certified or UL-listed explosion-proof motors (Class I, Division 1 or Division 2).

Q: What drive arrangement is recommended for high-temperature smoke exhaust?

A: Arrangement 4 (direct drive) is standard for high-temperature smoke extraction to eliminate belt slip or failure under thermal stress. Arrangement 9 (belt drive with the motor isolated outside the airstream) is utilized when ambient motor temperatures must be maintained below 40 deg C.

Q: What documentation is provided with each shipment?

A: Every order includes certified dimensional outline (GA) drawings, electrical wiring diagrams, dynamic balancing test reports, material test reports (MTRs) for pressure parts, and operation/maintenance manuals containing spare parts lists.

Q: What is the typical lead time for custom engineered exhaust fans?

A: Standard configurations ship within 3 to 4 weeks. Engineered-to-order units requiring special coatings, custom motor voltages, or specific flange drilling patterns typically require 6 to 8 weeks depending on raw material certification requirements.

Request a Quote

To receive a formal quotation with detailed performance curves, CAD models, and freight estimates, provide the following parameters to our engineering team:
Required airflow volume (CFM or m3/h) and static pressure (Delta P)
Gas stream temperature and chemical composition
Duct connection dimensions and orientation (discharge position)
Electrical supply specifications (Voltage / Frequency / Phase)
Required accessories and hazardous location classification

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