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Blauberg Iso-V 355 4E

Sound-insulated inline centrifugal fan.
Maximum air flow up to 2890 m³/h.
EAN codeEAN4058448016905
  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Designation key
  • Fan and accessories overall dimensions
  • Additional characteristics
  • Accessories

Supply and extract ventilation systems installed in premises with high requirements to the noise level. Various application possibilities due to a special transformable casing design. Suitable for use as separate components of air handling systems. Compatible with Ø 355 up to 710 mm round or 500x500 up to 1000x1000 mm rectangular air ducts.


Casing made of aluminium frame and removable aluzinc thermal- and sound-insulated double-skinned sandwich panels. Casing internally filled with 20 mm non-flammable mineral wool. Position of the removable panels can be adjusted to inline air flow or 90° angle air flow. Due to corrosion-resistant casing and thermal insulation the fan is suitable for external mounting. Square to square vibration absorbing connectors (AKV series) or square to round connector-reducers (ARV seris) may be connected to the fan (available upon separate order). The round spigot of the ARV connector-reducer is rubber sealed for air tight connection.


Four- or six-pole asynchronous motor with external rotor and centrifugal impeller with backward curved blades. Single-phase (E) or three-phase (D) motor modifications. Equipped with ball bearings for longer service life. Overheating protection by built-in thermal switches with leaded outside terminals for connection to external protecting controls. The thermal switch terminal leads are designed for connection to respective circuit ot the overload relay or respective terminals of the autotransformer or thyristor speed controller. The model Iso-V 355 4E incorporates thermal switches with automatic restart. Dynamically balanced impeller.


Smooth speed control with an external thyristor controller or step speed control with an external auto transformer (both available upon separate order).


The fan is mounted with rectangular or round air ducts. Connected to air ducts with flexible vibration-absorbing connectors or connecting reducers of respective diameters. Power is supplied to the fan through an external terminal box. The fans can be installed in any mounting position with respect to air flow direction in the system. While mounting provide enough servicing space. In case of outdoor mounting the fan may be equipped with the upper protecting cover (RSD-IV series) or the outer hood (AH-IV series) to be installed at air inlet/outlet.


max: high-powered motor.

Iso-V fan with vibration-absorbing flexible connectors AKV series   Iso-V fan with connecting reducers ARV series
Iso-V fans with AH-IV outer hood   Iso-V fans with RSD-IV protecting cover
Parameter Iso-V 355 4E Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50 Hz
Power 245 W
Current 1.12 A
RPM 1420 min-1
Max. air flow at air flow direction (perpendicular air flow) 2890 m³/h
Max. air flow at air flow direction (direct air flow) 2650 m³/h
Max. air flow at air flow direction (perpendicular air flow) 803 l/s
Max. air flow at air flow direction (direct air flow) 736 l/s
Sound pressure level at 3 m 54 dBА
Transported air temperature -25...+50 °С
Motor IP rating IP44 -
Ingress protection rating IPX4 -
EC motor no -
Casing material aluminium, aluzinc -
Outdoor mounting yes -
Sound-insulated casing yes -
Air duct for rectangular air ducts, for round air ducts -
Design centrifugal -
Type Exhaust, Supply -
Weight 25 kg
Mounting Inline -
ErP 2018 -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air capacity:
  • Pressure:
Operating point
  • Air capacity: --
  • Pressure: ---
Documents archieve
Documents archieve
Select a document type
  • Catalogues
  • Technical documentation
  • Certificates
Iso-V - data sheet (pdf 1.82Mb)
Iso-V - user's manual (pdf 4.1Mb)
Iso-V - image (png 710.32Kb)
Designation key
Designation key
Series Spigot diameter [mm] Motor Motor modifications
Number of poles Phase
Iso-V 355; 400; 450; 500; 560; 630; 710 4, 6 E: single-phase
D: three-phase
max: high-powered motor
Fan and accessories overall dimensions
Fan and accessories overall dimensions

Model Dimensions [mm] Weight [kg] Options
A ARV connector-reducer AKV vibration absorbing connector RSD-IV protecting cover AH-V outer hood
Iso-V 355 4E 500 25 ARV 355 AKV 500 RSD-IV 315-355 AH-IV 315-355


Model Dimensions [mm]
A B ∅ D
ARV 355 490 470 355
Model Dimensions [mm]
AKV 500 490 470 445
Model Dimensions [mm] Weight [kg]
AH-IV 315-355 478 458 225 3.2
Model Dimensions [mm] Weight [kg]
RSD-IV 315-355 600 2.3
Additional characteristics
Additional characteristics

Sound power level, A-weighted Total Octave frequency bands [Hz]
63 125 250 500 1000 2000 4000 8000
LwA to inlet [dBA] 70 55 58 61 63 62 60 52 47
LwA to outlet [dBA] 68 57 59 62 65 63 62 55 47
LwA to environment [dBA] 62 51 51 54 58 55 55 48 40
Speed controllers
Connecting reducers
Flexible connectors Outer hoods Protecting cover


CDT E1.8  / CDTE E1.8