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Ceiling mounted heat recovery air handling unit.
Rated air flow 1900 m³/h.

  • Description
  • Characteristics
  • Capacity diagram
  • Downloads
  • Dimensions
  • Additional characteristics
  • Designation key
  • Accessories
  • The intelligent arrangement of fans, heat recovery cores and filters, makes units slimline and easy to mount in small loft spaces, ceiling voids and false ceilings.
  • Such as electric & LPHW heaters, volume control dampers and Nox filters are available.
  • Casing panels made of zinc–aluminum coated steel with a 40 mm mineral wool heat- and sound-insulating layer.
  • Corrosion class C4 according to ISO 12944: class C4.
  • Each model available in left or right versions.
  • Service access on both sides and bottom.
  • Units are designed for indoor installation.
  • Supply and extract air flows are purified through two panel filters of the filtering class G4.
  • The supply filter of the filtering class F7 can be provided optionally.
  • Fans with ERP-compliant EC motors.
  • Impellers with backward-curved blades.
  • Low power consumption at any speed, low noise and stable operation in any climate.
  • High-efficient counter-flow heat exchanger made of polystyrene.
  • Stainless steel drain pan on both supply and exhaust sides.
  • Automatic heat exchanger bypass damper with Belimo actuator provides active frost protection, free-heating and freecooling functions.
  • The units are equipped with an integrated automation system.
  • The A21 controller enables integration of the unit into the Smart Home System or BMS (Building Management Systems).
  • The remote control panel is not included in the delivery set (purchased separately).
  • To control the unit via Wi-Fi, download the VENTS AHU mobile app.
Functions A21
Wired remote control panel Option (А22)
Control via a wired remote LCD control panel
Option (А25)
Wireless remote control panel Option (А22 Wi-Fi)
Control via Wi-Fi using a mobile application
Vents Cloud Server service
Freeze protection
Auto + manual
Week-scheduled operation
Filter replacement indication According to filter timer
According to filter clogging differential pressure switch readings
Alarm indication +
Speed selection +
Timers +
RH% sensor Option
CO2 sensor Option
VOC sensor Option
PM2.5 sensor Option
Boost mode +
Fireplace mode +
Preheater connection Option
Reheater connection Option
Cooler connection Option
Fire alarm sensor Option
Minimum supply air temperature control +
  • Automatic regulation of supply / extract air temperature (all units) or by room temperature (with A25 panel).
  • Automatic/manual by-pass regulation for freeheating, freecooling and frost protection.
  • Outputs for accessory A21 electric (triac PWM) or water (2-way/3way + pump) pre-heaters and/or re-heaters.
  • Cooling coil connection (for accessory DX or water coolers).
  • Water heater protection by back water temperature sensor and frost thermostat.
  • Electric coil overheating protection by two thermal contacts: 50°C with automatic reset and 90°C with manual restet.
  • Filter replacement indication by pressure switch.
  • Password protected engineering menu (only for A25 panel).
  • External damper connection.
  • Fire alarm input.
Parameter VUT 1500 PB EC A21
Measurement unit
Phase 1 ˜
Voltage 230 V
Power consumption 920 W
Current 4 A
Frequency 50/60 Hz
Air capacity 1900 m³/h
RPM 3000 min-1
Noise level at 3 m 29 dBА
Transported air temperature -25 ... +40 °С
Spigot size 600х350 mm
Heating electric heating, water heating -
Casing material aluzinc -
Insulation 40 mm mineral wool -
Filter: extract G4 (F7*) -
Filter: supply G4 (F7*) -
Mass 215 kg
Heat exchanger type counter-flow -
Heat exchanger material polystyrene -
SEC Class A+ -
Mounting flush mounting, ceiling mounting -
Option* -
Capacity diagram
Capacity diagram
  • Selection method:
  • Air flow:
  • Pressure:
Operating point
  • Air flow: --
  • Pressure: ---
Files archieve
Select document type
  • Advertising and printing products
  • Certificates
  • Technical documentation
"Wireless control system A21" user’s manual 09-2022 (V55-8EN-04) (pdf 415.1Kb)
"VENTS VUT 1500/2500/3500 PB EC" product description 06-2020 (pdf 1.23Mb)
Download high quality image "VENTS VUT 1500/2500/3500 PB EC (ErP 2015, 2016, 2018)" (psd 3.58Mb)
Download image "VENTS VUT 1500/2500/3500 PB EC (ErP 2015, 2016, 2018)" for your website (png 235.96Kb)
"VENTS VUT 1500/2500/3500 PB EC" user’s manual 09-2020 (V108-1EN-01) (pdf 1.87Mb)
Parameter Value Measurement unit
L 1646 mm
W 1500 mm
H 480 mm
Additional characteristics
Additional characteristics
A-weighted sound power level Gen. Octave-frequency band [Hz] LpA, 3 m dBA LpA, 1 m dBA
dBA 63 125 250 500 1000 2000 4000 8000
LwA to supply inlet dBA 52 57.3 53.6 53.5 47.8 47.2 43.5 41.3 32.7    
LwA to supply outlet dBA 76.4 62.3 61.6 65.5 66.8 70.2 71.5 69.3 61.7    
LwA to exhaust inlet dBA 52 57.3 53.6 53.5 47.8 47.2 43.5 41.3 32.7    
LwA to exhaust outlet dBA 75.4 61.3 60.6 64.5 65.8 69.2 70.5 68.3 60.7    
LwA environment dBA 49 56.3 53.6 54.5 39.8 39.2 40.5 37.3 30.7 29 39
Designation key
Designation key
Series Rated air flow [m³/h] Installation type Bypass Motor type Automation Accessories
VENTS VUT 1500; 2500; 3500 P: suspended installation B: bypass EC: synchronous electronically commutated motor A21 By default equipped with a differential pressure switch for controlling the contamination of filters (DTV)
  Control panel Control panel Control panel Electric heater Electric heater Electric heater
VUT 1500 PB EC A21 A22 A22 WiFi A25 HE 600x350-5,1-1 A21 HE 600х350-9,0-3 А21 HE 600х350-12,0-3 А21
VUT 2500 PB EC A21
VUT 3500 PB EC A21


  Freon cooler Water cooler Water heater Air damper F7 cassette filter G4 cassette filter
VUT 1500 PB EC A21 CDX 600х350-3 CW 600х350-3 HW 600х350-2 RRV P600x350 SF 196x384x40 F7 6 SF 196x384x40 G4 6
VUT 2500 PB EC A21
VUT 3500 PB EC A21 SF 253x603x48 F7 4 SF 253x603x48 G4 4


  Electric actuator Three-way motorized ball valve with actuator Water mixing set for water heater Filter pressure switch Flexible duct connection Duct silencer Round flange
VUT 1500 PB EC A21 TF 230 Belimo R3020-4-B1+LR24A-SR USVK 3/4-4 DTV 500 VVG AV 600x350 SR 600x350 FP AV 600x350-315
VUT 2500 PB EC A21 Belimo 600x350 R3020-6P3-B1+LR24A-SR USVK 3/4-6
VUT 3500 PB EC A21


  Room CO2 sensor with indication Duct CO2 sensor Humidity sensor Humidity sensor External VOC sensor (0-10V) External CO2 sensor (0-10V) External humidity sensor (0-10V)
VUT 1500 PB EC A21 CO2-1 KCO2-2 HV2 HRS DPWQ30600 DPWQ40200 DPWС11200
VUT 2500 PB EC A21
VUT 3500 PB EC A21
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