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Inline fan. Maximum air flow - 3350 m3/h.

  • Description
  • Characteristics
  • Downloads
  • Dimensions
  • Overall dimensions of brackets
  • Additional technical data
  • Designation key
  • The units are intended for supply, exhaust and supply and exhaust ventilation systems requiring a powerful air flow: commercial, office and other public or industrial premises as well as rooms with high humidity.
  • The fans are compatible with Ø 150, 160, 200, 250, 355 and 400 mm air ducts.
  • The casing is made of polymer (for models 355 and 400, the casing is additionally reinforced with a metal housing).
  • Due to the conically-shaped polymer impeller with specially profiled blades the air stream circular velocity increases, which results in higher air flow and pressure as compared to characteristics of standard axial fans.
  • The specially designed diffuser, impeller and airflow rectifier at the fan outlet provide smooth air flow distribution and enable the best combination of high air flow, increased pressure and low noise.
  • The fan casing is equipped with an airtight terminal box for connection to power mains.
  • The VENTS Boost fans are equipped with singlephase high-efficiency three-speed asynchronous motors with low power consumption.
  • The motor is equipped with thermal switches for overheating protection.
  • The ball bearings ensure a long service life (about 40 000 hours of continuous operation).
  • The motor ingress protection rating is IPX4.
  • The three-speed motor can be controlled using a built-in switch (option V) or an external switch P3-5.0 (purchased separately).
  • The fans can be mounted at any place and at any angle within the ductwork system.
  • Several fans can be installed in one system in parallel to attain higher air flow or in series to increase operating pressure in the system.
  • The fan casing is equipped with fixing brackets for floor, wall or ceiling mounting.
  • The fans can be mounted using KM-Boost brackets of the appropriate size (purchased separately, available for 355 and 400 models).
Parameter BOOST 400
Min speed
Mid speed
Max speed
Measurement unit
Voltage 1~230 1~230 1~230 V
Frequency 50 50 50 Hz
Sound pressure level at 3 m distance 40 42 43 dBА
Power 197 204 224 W
Maximum air capacity 744 871 931 l/s
Current 0.91 0.90 0.98 A
Maximum air capacity 2677 3136 3350 m³/h
RPM 1320 1390 1446 min-1
Max. transported air temperature -25...+55 -25...+55 -25...+55 °С
Protection rating IP X4 IP X4 IP X4 -
Motor protection rating IP 20 IP 20 IP 20 -
Duct diameter 400 400 400 mm
Design mixed-flow mixed-flow mixed-flow -
Casing material polymer polymer polymer -
Duct for round air ducts for round air ducts for round air ducts -
Mounting Inline Inline Inline -
Files archieve
Select document type
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  • Technical documentation
"VENTS BOOST 315/355/400 / VENTS BOOST 315/355/400 EC" user's manual 12-2021 (V208EN-06) (pdf 1.53Mb)
"VENTS BOOST" product description 08-2023 (pdf 1.45Mb)
Download image "VENTS BOOST / VENTS BOOST EC (ErP 2018)" for your website (png 353.29Kb)
Download high quality image "VENTS BOOST / VENTS BOOST EC (ErP 2018)" (psd 4.22Mb)
Download image "VENTS BOOST / VENTS BOOST 200 EC (ErP 2018)" for your website (png 359.49Kb)
Download high quality image "VENTS BOOST / VENTS BOOST 200 EC (ErP 2018)" (psd 4.13Mb)
"VENTS BOOST 150/160/200/250 / VENTS BOOST 150/160/200/250 EC" user's manual 01-2023 (V208-1EN-03) (pdf 1.27Mb)
Parameter Value Measurement unit
A 388 mm
∅D 395 mm
ØD1 441 mm
H 500 mm
Overall dimensions of brackets
Overall dimensions of brackets

Model Dimensions [mm]
A A1 H H1 B
KM-BOOST 400 563 624 235 228 180
Additional technical data
Additional technical data
Sound-power level, A -filter 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 71 57 62 66 65 64 61 55 47 51 61
LwA to outlet dBA 73 57 65 63 67 68 63 59 51 52 62
LwA to environment dBA 64 45 52 53 57 60 54 48 38 43 53
Designation key
Designation key
Series Air duct diameter [mm] Options
VENTS BOOST 150; 160; 200; 250; 355; 400 Un: speed controller with an electronic thermostat and external temperature sensor fixed
R: power cord with a mains plug
V: step speed controller
P: built-in smooth speed controller
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Basic parameter for domestic fan selection