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Centrifugal inline fan with capacity up to 360 m³/h in insulated casing.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • Video
  • The design of the KSB fans allows to use them in supply and exhaust ventilation systems in premises with high requirements to the noise level, efficiency and fan control and with limited space for mounting.

  • For example, the unit design includes a possibility of space-restricted installation above suspended ceilings. 

  • The KSB EC fans are designed for mounting into Ø 100, 125, 150, 160, 200, 250, 315 mm air ducts.

  • The fan casing is made of galvanized sheet steel using heat- and sound-insulation material.

  • The round connecting spigots are rubber sealed.

  • The unit is equipped with high-efficient external rotor EC motors and centrifugal impellers with backward curved blades.

  • These motors currently are the most cutting-edge solution in the field of energy conservation.

  • The use of EC motors allows to reduce the electricity consumption by 35% approximately while providing the high capacity and low noise level.

  • The EC motors are featured with high performance and totally controllable speed range.

  • The high efficiency (up to 90%) is a definite advantage of the EC motors.

  • The motors are equipped with rolling-element bearings that provide a longer operation period (40000 hours).

  • The fans are controlled by means of a 0-10 V external control signal while the performance regulation is based on the feedback from the temperature, smoke and other sensors as well as other vital parameter settings.

  • As the control signal changes the EC fan changes speed accordingly to supply the exact air amount required by the ventilation system.

  • The maximum fan speed does not depend on the electric mains frequency enabling compatibility with both 50 Hz and 60 Hz networks.

  • The fans can be easily combined into a single computer-controlled network.

  • Special software allows for precise control over the operating parameters of the network units.

  • The fans are intended for installation in round air ducts. They are installed between the air ducts. 

  • The use of flexible connectors requires fixation of the fan on the building structure by means of supports, mounts or fixing brackets.

  • The fan can be fixed in any position, taking into account the air flow direction indicated by the arrow on the fan casing.

  • While mounting the fan provide enough access for servicing and repair operations.

  • Electrical connection and installation must be performed in accordance with the instruction manual and the electrical connections diagram applied to the terminal box.

Parameter VENTS KSB 125 EC P
Measurement unit
Sound- and heat-insulated casing yes -
Duct diameter 125 mm
Design centrifugal -
Current 0.75 A
Phase 1 ˜
Voltage 230 V
Frequency 50/60 Hz
Air capacity 375 m³/h
Power consumption 92.6 W
EC motor yes -
RPM 3200 min-1
Max. transported air temperature -25 +60 °С
Protection rating IP X4 -
Sound pressure level at 3 m distance 34 dBА
Casing material galvanized steel -
SEC Class C -
Duct for round air ducts -
Type supply and exhaust -
Mounting Inline -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
Download high quality image "VENTS KSB EC (ErP 2018)" (psd 2.3Mb)
Download image "VENTS KSB EC (ErP 2018)" for your website (png 372.55Kb)
Brochure "VENTS KSB EC" (pdf 1.63Mb)
Parameter Value Measurement unit
∅D 124 mm
B 355 mm
B1 447 mm
B2 380 mm
H 200 mm
L 325 mm
L1 388 mm
L2 280 mm
Additional characteristics
Additional characteristics
Sound power level [dBA], A - weighted Octave frequency band [Hz] LpA, 3 m [dBA] LpA, 1 m [dBA]
Hz               Gen. 63 125 250 500 1000 2000 4000 8000
LwA to inlet dBA 60 46 54 58 50 46 40 40 31  40  50
LwA to outlet dBA 63 51 58 59 56 46 40 41 35  43  53
LwA to environment dBA 55 44 51 51 43 38 32 28 24 34 44
Designation key
Designation key
Series Air duct diameter Motor Options
VENTS KSB 100; 125; 150; 160; 200; 250; 315 ЕС: synchronous electronically commutated motor P: built-in smooth speed controller

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