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Low pressure axial fans (duct installation)

HRFD 250/4/2

HRFD 250/4/2

High efficiency axial fan 3-ph., pole-switching, Dahlander windings air flow direction "B"

Ref.-No. 00390

Features

High efficiency axial fan with cylindrical duct with flanges on both ends, directly driven. Cylindrical duct in galvanised sheet steel covering impeller with two flanges on both ends. Dimensions and flange fixing holes to DIN 24155. Terminal box on outer casing. Highly efficient, profiled blade impeller from polymers, aerodynamically optimised to the application, dynamically balanced. Suitable for -30 °C to +60 °C. Totally enclosed, 3-phase squirrel cage motor, 2-speed (pole switching with Dahlander windings). Maintenance free with low-noise sealed for life ball bearings.

Technical Data

General Information
Ref.-No.:00390
Type:HRFD 250/4/2
Flow rate free-blowing:2110 m³/h
RPM:1430/2770 min-1
Number of poles:4 / 2
Voltage:400 / 400 V , 3 W , 50 ph
Rated current (FLC) uncontrolled:0.16/0.43 A
Nominal power:58/212 W
Max. air flow temperature (uncontrolled):60 °C
IP protection category:55
Insulation class:B
PRODUCT_DETAILPAGE_wheel_diameter:250
Weight:8.5 kg
Wiring diagram no.:472
Acoustic data
Case breakout 44 dB(A) in 4 m