The Industrial Welding Fume Exhaust Fan provides high-static-pressure air movement designed to capture and evacuate toxic particulate, heavy metal oxides, and thermal gas plumes generated during shielded metal arc, MIG, and TIG welding processes. Engineered for continuous operation in severe metal fabrication environments, this unit integrates directly into modular source-capture arms, centralized duct networks, or mobile filtration systems. It isolates hazardous pollutants at the point of origin to maintain workplace air quality aligned with OSHA ventilation directives and ACGIH industrial hygiene parameters.

Key Features

High-Static-Pressure Performance Curve: Maintains stable air velocity under heavy system resistance introduced by accumulated filter cake, long horizontal duct runs, and multi-joint articulation arms.

Non-Sparking Centrifugal Impeller: Backward-curved wheel geometry cast or fabricated from spark-resistant aluminum-magnesium alloy or heavy-gauge coated steel, preventing mechanical friction ignition when processing hot metallic sparks.

Continuous-Duty Drive Assembly: Powered by TEFC (Totally Enclosed Fan Cooled) motors with IP55 environmental protection, rated for continuous multi-shift operation in ambient temperatures up to 40°C.

Multi-Stage Spark Trap: Built-in expansion chamber and baffle plate arrangement that intercepts hot slag and molten spatter before they reach primary filter media or fan housing components.

Standardized Flange Connections: Inlet and outlet ports feature pre-punched bolt patterns matching industrial spiral ductwork and flexible hose diameters.

Technical Specifications

Parameter	Specification Range	Unit / Standard
Airflow Volume (Capacity)	1,200 to 12,000	CFM (m3/h equivalent available)
Static Pressure Range	500 to 2,500	Pa
Motor Power Output	1.5 to 18.5	kW (2 to 25 HP)
Electrical Supply	220V-480V, 3-Phase	50Hz / 60Hz configurable
Impeller Design	Backward-Curved Centrifugal	Dynamically balanced to ISO 1940 Grade G6.3
Housing Construction	3mm to 5mm Carbon Steel / Stainless Steel	Powder-coated finish (120 um dry-film thickness)
Operating Temperature	-20°C to +80°C	Process airstream
Acoustic Output	68 to 82	dB(A) measured at 1.5 meters
Compliance & Ratings	CE, ISO 9001, AMCA airflow tested	Motor: IP55, Insulation Class F

Construction & Working Principle

Structural Build
Housing: Fabricated from heavy-gauge hot-rolled steel plates, continuously welded to eliminate air leakage, and reinforced externally with structural steel angles to suppress casing vibration under high static pressures.
Surface Treatment: Components undergo iron-phosphate chemical cleaning followed by an electrostatically applied, heat-cured epoxy-polyester powder coat to withstand abrasive metal dust and corrosive fumes.
Impeller Assembly: Backward-inclined airfoil blades welded to a precision-machined hub, individually balanced on Schenck horizontal balancing machines to ensure residual unbalance stays below strict operational thresholds.

Working Principle
Source Capture: Negative pressure draws contaminated air away from the welding arc through an adjustable hood or flexible arm.
Inertial Separation: Air enters the fan inlet; heavier slag particles and uncooled sparks lose momentum via gravity and the primary spark trap baffle.
Centrifugal Acceleration: The backward-curved impeller accelerates the air stream radially, converting mechanical shaft energy into static and velocity pressure.
Discharge: Exhaust air routes through vertical stacks or secondary filtration banks (HEPA/activated carbon) depending on facility air-recirculation protocols.

Applications

Robotic Welding Cells: Continuous-duty extraction mounted directly to automated gantry welding frames.

Manual Fabrication Booths: Paired with articulated extraction arms for stick (SMAW), MIG (GMAW), and TIG (GTAW) stations.

Shipbuilding & Heavy Structural Steel: High-volume clearance of confined spaces and large-scale assembly bays.

Plasma & Laser Cutting Auxiliary Exhaust: Supplemental draft generation for thermal cutting tables processing carbon steel and stainless alloys.

Available Options

Drive Configuration: Direct-drive (lower maintenance profile) or V-belt drive (adjustable RPM via pulley swaps for custom airflow tuning).

Explosion-Proof Package: ATEX/Ex-certified motors and spark-proof copper-alloy inlet rings for volatile petrochemical or aerospace environments.

Vibration Isolation: Seismic spring isolators and flexible duct connectors to eliminate structural resonance transfer into building frames.

Variable Frequency Drive (VFD): Integrated inverter panels for demand-controlled ventilation and energy optimization.

Manufacturing & Quality Control

Sheet Metal Processing: CNC laser cutting systems (+/-0.1 mm tolerance) and multi-axis CNC press brakes ensure consistent housing geometry and tight running clearances between the inlet cone and impeller.

Welding Operations: Certified structural welders execute MIG/TIG passes under AWS D1.1 standards, ensuring full-penetration seams on high-stress fan scrolls.

Balancing & Run-Test: Every assembled impeller and motor assembly undergoes mandatory multi-plane dynamic balancing followed by a 4-hour full-load thermal and vibration bench test. Data reports are archived by serial number for quality traceability.

Surface Testing: Coating adhesion is verified using cross-hatch tape tests, and dry-film thickness is measured magnetically prior to final packaging.

FAQ

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

A: CFM depends on the capture velocity needed at the hood face (typically 100 to 150 FPM for welding fumes) and the distance from the source. For a standard 6-inch articulating extraction arm, systems generally require 800 to 1,200 CFM per drop to effectively capture rising thermal plumes.

Q: Can this fan handle continuous multi-shift operation?

A: Yes. The unit utilizes heavy-duty cast-iron pillow block bearings rated for an L10 life exceeding 100,000 hours, paired with TEFC continuous-duty motors designed to run 24/7 in industrial thermal conditions.

Q: How does the spark trap prevent fire hazards in ductwork?

A: The built-in expansion chamber slows air velocity momentarily and forces directional changes. Heavy, incandescent particles lose momentum and drop into an accessible cleanout drawer before reaching the fabric filters or fan wheel.

Q: What is the difference between direct-drive and belt-drive options for this application?

A: Direct-drive fans couple the impeller directly to the motor shaft, reducing maintenance intervals by eliminating belts and pulleys. Belt-drive fans allow easy speed adjustments via pulley changes to modify CFM and static pressure post-installation if facility duct layouts change.

Q: Do these fans comply with environmental and safety regulations?

A: The units comply with OSHA ventilation guidelines and ACGIH (American Conference of Governmental Industrial Hygienists) industrial ventilation standards. Motors and electrical panels carry CE and UL-recognized component certifications.

Q: What lead time can we expect for custom or OEM volume orders?

A: Standard catalog configurations ship within 15 to 20 business days. Custom engineered high-pressure units or explosion-proof builds typically require 30 to 45 days, supported by raw material stock verification prior to order confirmation.

Request a Quote

To receive a precise technical proposal and commercial pricing matching your ventilation requirements, please provide the following details:

Required airflow (CFM or m3/h) and total static pressure (Pa or in. wg)
Number of extraction points or duct run dimensions
Power supply availability (Voltage / Phase / Frequency)
Special environmental conditions (Corrosive gases, high ambient temperature, or explosion-proof requirements)

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