Cleanroom HVAC and Air Handling Equipment

EC Centrifugal Cleanroom Supply-Air Fan Unit

An insulated inline fan package using a direct-drive backward-curved EC impeller to deliver stable cleanroom supply airflow against filters, coils and distribution pressure losses.

Backward-Curved EC Impeller
Stepless Airflow Adjustment
Insulated Low-Leakage Cabinet
Vibration-Isolated Fan Module

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Product Introduction

The EC centrifugal supply-air fan unit places a high-efficiency backward-curved impeller, electronically commutated motor, airflow sensing and flexible connections inside a rigid insulated cabinet. Direct drive removes belts and their wear particles, while variable speed allows the fan to compensate for filter loading or switch between occupied and setback airflow. Removable panels provide access to the wheel, motor electronics and isolation mounts from outside the air path.

Key Features

The backward-curved impeller operates without a scroll housing and maintains stable efficiency across a broad cleanroom duty range.

Integrated EC speed control accepts analog or network commands without an external variable-frequency drive for smaller fan sizes.

Flexible inlet and discharge connections prevent casing vibration from transferring into rigid cleanroom ductwork.

An insulated double-skin cabinet reduces breakout noise and limits condensation on the casing during cold supply-air operation.

Customer Product Concerns

Cleanroom supply fans must overcome rising filter resistance while holding the scheduled airflow without adding unnecessary noise, vibration or maintenance debris.

Supply airflow falls as final filters accumulate dust, reducing room air changes and pressure.Closed-loop EC speed control increases fan output against the measured airflow or duct-pressure setpoint.

Belt dust and periodic tension adjustment are undesirable near a clean supply-air path.A direct-drive impeller eliminates belts, pulleys and routine belt alignment.

Fan vibration travels through the duct and becomes audible inside quiet cleanrooms.Spring or elastomer isolators and flexible connectors decouple the rotating assembly from the cabinet and duct.

A cramped plantroom prevents removal of the entire fan section for service.Large side panels expose the motor and wheel, while a slide-out fan base permits component replacement from one service side.

Typical Applications

Cleanroom AHU supply-fan replacement modulesFiltered make-up air booster systemsPharmaceutical production supply branchesLaboratory air-distribution pressure controlElectronics clean-bay ventilation

Technical Parameters

Typical construction ranges for an insulated EC centrifugal supply-air fan package are listed below.

Core Material	Aluminum or coated-steel backward-curved impeller in a mineral-wool-insulated galvanized steel cabinet
Panel Thickness	30-50 mm double-skin acoustic and thermal panel thickness
Effective Width	800-2400 mm nominal fan-cabinet width
Maximum Length	Up to 3500 mm for multi-fan or fan-plus-silencer assemblies
Steel Facing Thickness	0.8-1.2 mm pre-painted outer skin and galvanized inner skin
Core Density	40-80 kg/m³ typical mineral-wool cabinet insulation density
Thermal Conductivity	Approximately 0.035-0.045 W/(m·K) for mineral-wool cabinet insulation
Surface Finish	White powder-coated frame with blue service doors and corrosion-resistant internal fan surfaces
Joint Type	Bolted gasketed cabinet with flexible inlet and discharge connectors and vibration-isolated fan base
Customization	Available based on the intended application and operating environment.

Available Options

Single fan or parallel fan-array configurationConstant-airflow or constant-static-pressure controllerAcoustic attenuator and perforated inner linerGalvanized coated-aluminum or stainless air-path construction

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