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Centrifugal duct fan in a heat- and sound-insulated casing with air flow up to 1682 m³/h.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • The KSF K2 EC fans are designed for supply and exhaust ventilation of premises with high requirements to the noise level and with limited space for mounting.
  • For example, the unit design includes a possibility of space-restricted installation above suspended ceilings.
  • Compatible with Ø 100-250 mm air ducts.
  • The fan casing is made of aluzinc.
  • For easy installation and operation, the cover of the fan is secured with a special lock.
  • The casing is heat- and sound-insulated with a 50 mm layer of non-flammable mineral wool.
  • To ensure better noise absorption, the inner surface of the insulation is made of a perforated metal sheet.
  • The round connecting spigots are rubber sealed.
  • The units feature efficient electronically commutated (EC) direct current motors with an external rotor and centrifugal impellers with forward curved blades.
  • EC motor is free of friction and wear parts such as a commutator and brushes.
  • These components are replaced by a maintenance-free electronic circuit board.
  • EC motors are characterised with high performance and optimum control across the entire speed range.
  • In addition to that, the efficiency of the electronically commutated motor reaches very impressive levels of up to 90 %.
  • The fan is controlled with an external control signal 0-10 V (capacity control is performed depending on temperature, pressure, smoke level etc.).
  • The fan has low energy consumption at any speed.
  • Maximum fan speed does not depend on the available current frequency and is suitable for operation both at 50 and 60 Hz.
  • The fans can be connected to centralized computer ventilation control systems.
  • Duct fans are intended for mounting to round air ducts.
  • The fans are installed between the air ducts.
  • In case the fan is mounted on flexible joints, attach the fan to a structural unit by means of supports, suspension links or brackets.
  • The fan may be installed in any position in consideration of the air flow direction (as indicated by the arrow on the fan casing).
  • While mounting the fan provide enough access for servicing and repair operations.
Parameter KSF 250 K2 EC
Measurement unit
Power 374 kW
Frequency 50/60 Hz
Duct diameter 250 mm
Phase 1 ˜
Design centrifugal -
Voltage 230 V
Current 1.77 A
Air capacity 1682 m³/h
EC motor yes -
RPM 1400 min-1
Protection rating IP 44 -
Transported air temperature -25 ... +50 °С
Sound pressure level at 3 m distance 41 dBА
Casing material aluzinc -
Mass 33 kg
SEC Class - -
Outdoor mounting no -
Sound-insulated casing yes -
Type supply and exhaust -
Mounting Inline -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
Brochure "VENTS KSF K2 EC" (pdf 992.32Kb)
Download image "VENTS KSF K2 EC (ErP 2018)" for your website (png 209.74Kb)
Download high quality image "VENTS KSF K2 EC (ErP 2018)" (psd 3.62Mb)
User's manual "VENTS KSF K2 EC" (pdf 1.72Mb)
Parameter Value Measurement unit
∅D 247 mm
B 665 mm
B1 487 mm
B2 742 mm
L1 699 mm
H 411 mm
L2 606 mm
Additional characteristics
Additional characteristics
Sound power level [A-filter] Sound pressure level at a distance of 3 m [A-filter] Sound pressure level at a distance of 1 m [A-filter]
Sound power level Gen. Octave frequency band [Hz]
  Hz 63 125 250 500 1000 2000 4000 8000 LpA, 3 m dBA LpA, 1 m dBA
LwA to inlet dBA 79 65 75 74 71 69 67 65 59 59 69
LwA to outlet dBA 83 62 74 77 76 75 75 71 62 62 72
LwA to environment dBA 62 34 47 56 55 56 55 47 37 41 51
Designation key
Designation key
Series Duct diameter Modification Motor Options
VENTS KSF 100, 125, 150, 160, 200, 250 К2: heat- and sound-insulated casing ЕС: synchronous electronically commutated motor R: power cord with the IEC C14 connector
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