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VENTS DuoVent 355 EC

Centrifugal fan in a metal casing for round air ducts. Air flow up to 3060 m³/h

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • Exhaust ventilation systems for commercial, office and other public or industrial premises with limited installation space.
  • The DuoVent EC fan ensures uninterrupted ventilation operation: if one fan fails, the second fan automatically switches on.
  • The modes are controlled by the controller, which is not included in the delivery set and must be ordered separately.
  • Designed for connection to round air ducts with a diameter of 150 to 400 mm.
  • The fan casing is made of galvanized sheet steel using heat- and sound-insulation material.
  • The air damper allows adjusting the direction of air flow.
  • Controlled by the air flow.
  • The round connecting spigots are rubber sealed.
  • The hinged cover gives free access to the motors, simplifies installation and maintenance of the fans and ducts without dismantling.
  • The unit is equipped with high-efficient electronically commutated (EC) DC motors with mixed-type impellers.
  • These state-of-the-art motors are the most advanced solution in energy efficiency today.
  • The motors are equipped with built-in overheating protection.
  • Ball bearings in the motor ensure long service life (40 000 hours).
  • To achieve accurate performance, low noise levels and safe fan operation, each turbine is dynamically balanced during assembly.
  • The motor ingress protection rating is IP44.
  • Thanks to the improved mixed-type impeller, which is a hybrid of axial and centrifugal impeller, the DuoVent EC unit has low power consumption and noise level with high performance.
  • The diffuser, the specially profiled impeller and the directing vanes at the outlet of the fan casing distribute air flow in such a way as to attain the best combination of high performance and high pressure at low noise level.
  • Allows tracking the motor failures and signalling them, as well as automatically switching the unit to work with a functioning motor.
  • The controller is not included in the delivery set and must be ordered separately.
Controller functions:  
  • Automatic alternation of the active fan with preset switching period.
  • Forced constant operation of the fan A.
  • Forced constant operation of the fan B.
  • Fan alarm. The failed fan is switched off, the second fan is switched on. The controller generates an error signal and corresponding indication.
  • Fan speed control.
  • Boost mode increases the performance of the fan. It is possible to set the time during which the fan will run in this mode.
  • Test mode. Automatic alternation of the active fan with a period from 1 to 12 min.
  • Checking motors at start-up.
  • Possibility of connection to BMS.
  • Possibility of connecting an external 0-10 V sensor.
  • Possibility of connecting external devices (10 V and 24 V).
  • The duct fans are intended for mounting to round air ducts.
  • The fans are installed between the air ducts.
  • While mounting the fan provide enough access for servicing and repair operations.
Parameter DuoVent 355 EC
Measurement unit
Phase 1 ˜
Fan current 1.57 A
Power consumption 354 W
Frequency 50/60 Hz
Maximum air capacity 850 l/s
Maximum air capacity 3060 m³/h
RPM 2470 min-1
Sound pressure level at 3 m 45 dBА
Protection rating IP X4 -
Motor protection rating IP44 -
Duct diameter 355 mm
Transported air temperature -25 ... +55 °С
Sound- and heat-insulated casing yes -
Casing material galvanized steel -
Weight 97 kg
Duct for round air ducts -
Type exhaust -
Mounting Inline -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
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  • Technical documentation
"VENTS DuoVent EC" product description 07-2023 (pdf 977.37Kb)
Download high quality image "VENTS DuoVent EC (ErP 2018)" (psd 3.76Mb)
Download image "VENTS DuoVent EC (ErP 2018)" for your website (png 247.71Kb)
"VENTS DuoVent (EC)" user's manual 01-2023 (V256EN-05) (pdf 1.17Mb)
VENTS DuoVent 355 EC
Parameter Value Measurement unit
∅D 354 mm
H 520 mm
L 1334 mm
L1 1170 mm
W 1092 mm
W1 1010 mm
Additional characteristics
Additional characteristics
A-weighted sound power level 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 72 47 68 70 56 48 44 48 39 52 62
LwA to outlet dBA 71 42 63 70 55 43 41 48 42 50 60
LwA to environment dBA 66 45 64 61 49 42 36 36 29 45 55
Designation key
Designation key
Series Spigot diameter [mm] Motor type
VENTS DuoVent: sound-insulated fan for round air ducts with two motors 150; 200; 250; 315; 350; 400 EC: synchronous electronically commutated motor
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