Cleanroom HVAC and Air Handling Equipment

Explosion-Proof Axial Exhaust Fan

A heavy-duty tubular axial fan configured as a complete hazardous-area ventilation assembly, with matched motor protection, material pairing, grounding and cable-entry protection selected for the intended service.

Hazardous-Area Motor Options
Controlled Impeller Tip Clearance
Bonded and Grounded Metalwork
Protected Cable Entries

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Product Introduction

This explosion-proof axial exhaust fan is configured as a complete hazardous-area ventilation assembly rather than relying on one blade material alone. The long-cased steel housing, impeller and casing material pairing, running clearance, compatible hazardous-area motor, external terminal enclosure, bonding provisions and cable glands are selected together for the intended gas group, temperature class and Zone or Class. External electrical access and bolted duct flanges allow the rotating and wiring components to be inspected without removing the complete duct run.

Key Features

The impeller alloy, casing contact material and running clearance are selected together as one spark-resistant construction instead of treating aluminum blades alone as protection.

External Ex d flameproof or Ex e increased-safety motor arrangements can be matched to the electrical classification and conveyed atmosphere.

A metal terminal enclosure, hazardous-area cable glands and identified bonding points provide a controlled electrical connection at the fan body.

Heavy-gauge welded casing, spun flanges and external stiffeners help preserve the specified tip clearance during horizontal or vertical installation.

Customer Product Concerns

Ventilation in flammable-vapor areas must move the required air while the complete mechanical and electrical construction addresses foreseeable ignition sources.

An unsuitable impeller and casing material combination can produce friction or impact sparks even when one component is aluminum.The material pairing, tip clearance, casing rigidity and inspection access are selected and maintained as one spark-resistant fan construction.

A motor, terminal box or cable gland that does not match the hazardous-area classification can remain an electrical ignition source.A compatible Ex motor arrangement, protected terminal enclosure and hazardous-area cable glands are selected for the intended Zone or Class, gas group and temperature class.

Static charge can accumulate across isolated metal duct and fan sections.Dedicated bonding lugs and grounded conductive connections maintain electrical continuity across the casing, flanges and adjacent ductwork.

Corrosion or casing distortion can reduce blade clearance after prolonged chemical-service operation.A reinforced corrosion-protected shell and accessible inspection points support routine checks of coating condition, fasteners and running clearance.

Typical Applications

Solvent storage and dispensing-room exhaustBattery electrolyte mixing and filling ventilationPharmaceutical alcohol-process extractionPaint and coating preparation areasChemical cleanroom support-space exhaust

Technical Parameters

Typical structural ranges for a configurable external-motor axial fan intended for hazardous-area exhaust service are listed below.

Core Material	Hot-dip galvanized or epoxy-coated steel long casing with a manufacturer-selected impeller/casing material pairing, compatible hazardous-area motor and external terminal enclosure
Panel Thickness	3.0-6.0 mm heavy-gauge welded casing thickness
Effective Width	450-1600 mm nominal clear fan diameter
Maximum Length	Up to 3000 mm overall length including external motor supports and terminal enclosure
Steel Facing Thickness	3.0-6.0 mm carbon-steel casing, flange and reinforcement plate
Core Density	Approximately 7800-7900 kg/m³ for the reinforced carbon-steel casing
Thermal Conductivity	Approximately 45-55 W/(m·K) for the carbon-steel shell and support structure
Surface Finish	Hot-dip galvanizing or chemical-resistant coating with corrosion-resistant impeller finish and designated bonding points
Joint Type	Welded long casing with bolted circular flanges, maintained impeller clearance, bonding lugs and hazardous-area cable glands
Customization	Available based on the intended application and operating environment.

Available Options

Ex d flameproof or Ex e increased-safety motor and terminal arrangement selected for the intended atmosphereZone 1 or Zone 2, or Class I Division 1 or 2 electrical configuration where required by the site classificationImpeller and casing material pairing selected for the applicable spark-resistant construction levelFlexible connectors, safety guard, drain, inspection cover and vertical mounting supports

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