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Large black centrifugal fan with backward-curved blades and external rotor motor

Fans

Fans R2D250-AM20-09 250mm centrifugal case fan

SKU CH-64R8-305MT

A 250 mm centrifugal case fan with backward-curved blades delivering up to 35000 m³/h airflow from a 3-phase EC motor running at 2700–3200 rpm on 400–480 VAC

  • High airflow up to 35000 m³/h for demanding cooling
  • 100 % speed control via analog or serial interface
  • Three-phase motor runs on 400/460/480 VAC supplies
  • Operates from -25 °C to 90 °C ambient temperature
  • Backward-curved blades eliminate need for scroll housing

Industrial centrifugal fan

The Fans R2D250-AM20-09 is a 250 mm ebmpapst centrifugal blower built for industrial air-intake duties. Its backward-curved impeller and external-rotor motor deliver up to 35000 m³/h without a scroll housing. The unit is supplied new and rated for continuous operation from -25 °C to 90 °C.

Three-phase power and control

Verify that your installation provides three-phase AC at 400 V, 460 V or 480 V and either 50 Hz or 60 Hz as listed in the motor data. The motor draws between 0.30 A and 0.39 A depending on voltage and frequency. Speed is adjustable from 0 to 100 % via an analog or serial interface, so the control system must support that signal type.

Mounting and airflow integration

The compact steel-plate housing allows direct mounting in ductwork or equipment enclosures without a separate scroll. Backward-curved blades create a non-overloading power curve from 170 W to 270 W across the voltage range. Ensure the surrounding structure can handle the reaction forces and that intake and exhaust paths remain unobstructed for the rated flow.

Highlights

  • High airflow up to 35000 m³/h for demanding cooling
  • 100 % speed control via analog or serial interface
  • Three-phase motor runs on 400/460/480 VAC supplies
  • Operates from -25 °C to 90 °C ambient temperature
  • Backward-curved blades eliminate need for scroll housing

Specifications

No published specifications for this item yet.

Questions about this item

What does the R2D250-AM20-09 package include and what must be sourced separately?

The fan ships as a single centrifugal unit with backward-curved blades and integrated EC motor. Mounting hardware, wiring harness, speed-control interface and any required ducting or filters are not included.

Which voltage and frequency variant of the R2D250-AM20-09 should I select for a 400 VAC 50 Hz supply?

Choose the 400 VAC / 50 Hz winding listed in the data; it draws 0.30 A, consumes 170 W and runs at 2700 rpm under those conditions.

What does the 35000 m³/h airflow figure mean when the fan is installed in a real chassis?

35000 m³/h is the free-air maximum. In a case with filters, grilles and duct resistance the delivered airflow will be lower; the curve shows zero flow at 0 Pa back-pressure, so actual volume depends on system impedance.

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