Cleanroom HVAC and Air Handling Equipment

Tube-Axial Flow Fan

A high-volume cylindrical fan using an adjustable-pitch axial impeller to move air through straight ducts with low-to-medium system resistance.

High-Volume Axial Airflow
Adjustable-Pitch Airfoil Blades
External Motor Cooling
Rigid Flanged Tube Casing

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Product Introduction

The tube-axial flow fan uses an aluminum airfoil impeller centered inside a close-clearance galvanized steel cylinder. The blades accelerate air parallel to the shaft, making the fan suitable for large airflow duties where a full centrifugal scroll is unnecessary. An external motor and shaft arrangement leaves the duct bore comparatively open, protects the motor from the conveyed air and gives technicians direct access to the drive without removing the cylindrical casing from the duct.

Key Features

Adjustable-pitch airfoil blades allow the impeller to be matched to the required volume and pressure before operation.

A close, even tip clearance reduces bypass at the blade ends and supports repeatable axial performance.

The hot-dip galvanized cylindrical shell resists corrosion and maintains flange alignment under duct loads.

An externally mounted motor and bearing frame keep heat-producing drive components outside the airflow passage.

Customer Product Concerns

High-airflow systems need a compact fan with low pressure loss, but poor blade selection or uneven tip clearance can cause noise and reduced output.

A centrifugal fan adds unnecessary footprint and turning losses to a nearly straight low-resistance duct.The axial impeller moves air in the duct direction and fits within the circular passage without a scroll casing.

A fixed propeller cannot be matched closely when the final airflow duty changes during design.Adjustable blade pitch provides a practical way to select the required pressure and volume within the fan size.

Motor heat and dust exposure shorten service life when the motor sits directly in the exhaust stream.The external motor frame removes the motor body from the conveyed air while transmitting power through a protected shaft.

Uneven casing geometry creates variable blade-tip clearance and local turbulence.A rolled and reinforced tube maintains a concentric bore around the balanced aluminum impeller.

Typical Applications

Large-volume cleanroom general exhaustMechanical-room general heat exhaustSupply-air transfer between low-resistance zonesIndustrial process cooling and drying ductsLongitudinal ventilation in technical corridors

Technical Parameters

Representative construction ranges for an external-motor tube-axial fan used in high-volume ventilation are provided below.

Core Material	Die-cast aluminum airfoil blades and hub inside a reinforced hot-dip galvanized steel tube
Panel Thickness	2.0-4.0 mm rolled cylindrical casing thickness
Effective Width	450-1600 mm nominal clear bore diameter
Maximum Length	Up to 2800 mm overall length including the external motor support frame
Steel Facing Thickness	2.0-4.0 mm galvanized steel shell and spun flange material
Core Density	Approximately 2680-2720 kg/m³ for the cast aluminum impeller components
Thermal Conductivity	Approximately 200-235 W/(m·K) for the aluminum blade and hub alloy
Surface Finish	Hot-dip galvanized casing with passivated aluminum impeller and blue protective motor coating
Joint Type	Rolled welded tube with bolted end flanges, keyed impeller hub and externally supported drive shaft
Customization	Available based on the intended application and operating environment.

Available Options

Fixed-pitch or adjustable-pitch aluminum impellerDirect-drive, belt-drive or external-coupled motorInlet bell, safety guard and flexible duct connectorsReversible-flow blade and vertical mounting arrangement

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