STjh 400 mm backward-curved centrifugal fan with a medium steel impeller and support plate on white.

STJH-BACKWARD-CURVED-CENTRIFUGAL-FAN-400MM

Backward-Curved Centrifugal Fan 400 mm

A medium 400 mm free-running centrifugal wheel with backward-curved blades and documented G2.5 balance quality.

400 mm impeller diameter
G2.5 balance quality
Composite or steel configuration

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Product Introduction

The 400 mm model provides a larger free-running wheel for medium air-handling duties and may be configured with composite or steel impeller construction. Its documented G2.5 balance quality supports smooth operation when the inlet ring, motor and support frame are correctly aligned.

Key Features

Medium AHU airflow class

The 400 mm diameter offers more capacity than the compact wheel without requiring the broad enclosure of the 630 mm version.

Controlled rotating balance

G2.5 balance quality helps limit vibration transferred into a cleanroom air-handler structure.

Material selection flexibility

Composite and steel wheel options allow the rotating assembly to suit hygiene, temperature and mechanical duty.

Technical Parameters

Impeller Diameter	400 mm
Blade Geometry	Backward curved
Balance Quality	G2.5
Material Options	Composite or steel by configuration
Fan Arrangement	Free-running centrifugal
Inlet	Single inlet with matched ring
Drive	Direct motor coupling
Discharge	Open AHU plenum
Duty	Medium supply, return or recirculation
Customization	Impeller material, motor, frame and control method can be configured for the intended application and operating environment.

Applications

Medium cleanroom supply AHUs, return-air handlers, recirculation units and controlled process ventilation.

Solutions for Your Application

A compact impeller runs too quickly and produces excessive sound at the required duty.Use the larger 400 mm wheel at an operating speed selected from the fan curve and verify the plenum acoustics.

Fan vibration could be transmitted to filters or lightweight casing panels.Preserve the G2.5 wheel balance with accurate inlet alignment, a rigid base and suitable isolators.

Available Options

Composite or steel impeller, EC motor, inlet ring, welded support frame, guards and airflow-control sensors are available.

Planning a Backward-Curved Centrifugal Fan 400 mm specification?

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