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Blauberg Iso-ZS 315/2x250 6E max

Sound-insulated inline centrifugal fans. Maximum air flow up to 3850 m³/h.
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  • Designation key

Supply and extract ventilation systems installed in premises with high requirements to the noise level.Compatible with ∅ 250 or 315 mm round air ducts.

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


Galvanized steel casing internally filled with 30 mm thermal- and sound-insulating layer made of non-flammable foamed polyurethane.The connection spigots are equipped with rubber seals.External terminal block for power supply.Lifting lugs facilitate hanging and transportation operations.Modifications with two ∅ 250 mm suction spigots are available specifically for multi-port ventilation solutions (Iso-ZS 315/2x250).

Mounted with round air ducts.Suitable for installation in any mounting position with respect to air flow direction in the system, fixed with supports or brackets.Suspended to ceiling with mounting lugs.Flexible air ducts are fixed on the fan spigots with clamps.


max: high-powered motor.G1: speed controller, temperature controller with external temperature sensor (cable length 4 m), power cable with mains plug.GI1: speed controller, temperature controller with integrated temperature sensor and power cable with mains plug.The G1 and GI1 modifications enable automatic speed control depending on indoor temperature. The optimal ventilation solution for premises requiring permanent temperature control as greenhouses, orangeries, etc.W1: power cable with mains plug.


Four- or six-pole asynchronous motor with external rotor and double intake centrifugal impeller with forward curved blades.The motor is installed on specially designed vibration-damping mounts to absorb vibration and noise.Equipped with ball bearings for longer service life.Integrated thermal protection with automatic restart.Dynamically balanced impeller.

Parameter Iso-ZS 315/2x250 6E max Measurement unit
Voltage 230 V
Phase 1 ˜
Frequency 50 Hz
Current 5.06 A
Power 953 W
RPM 970 min-1
Maximum air capacity 3850 m³/h
Sound pressure level at a distance of 3 m 43 dBА
Max. operating temperature -20…+50 °С
EC motor no -
Ingress protection rating IPX4 -
Casing material galvanized steel -
Outdoor mounting no -
Sound-insulated casing yes -
Air duct for round air ducts -
Design centrifugal -
Type Exhaust, Supply -
Weight 45.0 kg
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Iso-ZS - data sheet (pdf 1018.31Kb)
Iso-ZS - image (png 740.81Kb)

Type   Dimensions [mm]
D D1 d B B1 B2 B3 H H1 H2 H3 H4 L L1 L2
Iso-ZS 315/2x250 6E max (Fig.2) 313 248 25 670 620 216 457 610 450 186 427 658 825 725 660


Designation key
Designation key
Series   Flange diameter   Motor   Motor modifications    Options 
Exhaust flange diameter  / Number of intake flanges  x Intake flange diameter* Number of poles Phase
Iso-ZS 250; 315 2 250 4; 6 E: single-phase max: high-powered motor G1: speed controller, temperature controller with external temperature sensor, power cable with mains plug
GI1: speed controller, temperature controller with integrated temperature sensor and power cable mains plug
W1: power cable with mains plug

* no intake flange diameter if it is equal to the exhaust flange diameter