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Windis Free 350 - Air Curtain for Open-Space Installation

The water-circulated Windis Free 350 is designed for open-space installation and is an excellent choice for retail premises, offices, schools, and daycare centres.

The unit can be installed at heights of up to 3.5 metres and is available in four different widths: 1 m, 1.5 m, 2 m, and 2.5 m.

An integrated controller is included as standard, which can be connected to a building automation system.

Also available in stainless steel

More than just an air curtain – a solution that adds value to the entire building.

Our units are designed to provide comfortable conditions and reduce energy consumption.

Performance

Integrated thermal energy measurement

Adjustable discharge impulse

High-performance EC fans

Quick Installation

Quick connectors for external sensors

Integrated heating valve

Features

Modbus TCP and BACnet IP interface

Heating network pressure monitoring

Built-in frost protection detection

Windis Free 350 - Air Curtain for Open-Space Installation

Windis Free - 350 - 100 (Width: 1,0m)Windis Free - 350 - 1500 (Width: 1,5m)Windis Free - 350 - 200 (Width: 2,0m)Windis Free - 350 - 250 (Width: 2,5m)Technical SpecificationsScope of delivery

Windis Free - 350 - 100 (Width: 1,0m)

Air flow: 1692 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 6,80 kW
  • Water flow: 0,055 l/s
  • Pressure drop: 2 kPa

50/30 °C water: 

  • Power: 6,42 kW
  • Water flow: 0,077 l/s
  • Pressure drop: 2 kPa

Electric power: 333 W

Sound pressure: 

  • 73 dB (10 m² Sabine)
  • 60 dB (5m equivalent absorption area measured at a distance (200 m²)



Windis Free - 350 - 1500 (Width: 1,5m)

Air flow: 2433 m³/h

Air inlet: 18 °C

60/30 °C water:

  • Power: 12,80 kW
  • Water flow: 0,103 l/s
  • Pressure drop: 4 kPa

50/30 °C water:

  • Power: 11,17 kW
  • Water flow: 0,135 l/s
  • Pressure drop: 5,03 kPa

Electric power: 502 W

Sound pressure: 

  • 76 dB (10 m² Sabine)
  • 63 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Free - 350 - 200 (Width: 2,0m)

Air flow: 3230 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 13,24 kW
  • Water flow: 0,106 l/s
  • Pressure drop: 2 kPa

50/30 °C water:

  • Power: 12,44 kW
  • Water flow: 0,15 l/s
  • Pressure drop: 2 kPa

Electric power: 666 W

Sound pressure: 

  • 76 dB (10 m² Sabine)
  • 63 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Free - 350 - 250 (Width: 2,5m)

Air flow: 4473 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 21,04 kW
  • Water flow: 0,170 l/s
  • Pressure drop: 2 kPa

50/30 °C water:

  • Power: 18,70 kW
  • Water flow: 0,226 l/s
  • Pressure drop: 3 kPa

Electric power: 666 W

Sound pressure: 

  • 77 dB (10 m² Sabine)
  • 64 dB (5m equivalent absorption area measured at a distance (200 m²)

Technical Specifications

​Color:

​• Casing: RAL 7035

​• Grille: RAL 7024

​• Other RALcolours available on request


Fan:

​• EC centrifugal fans, ball bearings


Heating coil:

​• Copper tubes 3/8", aluminium fins, max 6 bar / 100°C


Electrical Connections:

​• Power supply: 2 m safety-earthed plug


Other connections: M12 connectors, Ethernet, USB


Scope of Delivery

Integrated inside the unit:

​• Energy meter (ultrasonic flow measurement)

​• 2-way heating valve, Belimo C215Q-J / C220Q-K

​• Actuator with 15 s operating time

​• Discharge impulse control

​• Water inlet and outlet temperature measurement

​• Air inlet and outlet temperature measurement

​• Frost protection detection

​• Heating network pressure measurement

​• Air bubble detection

​• G4 filter

Communication interfaces::

​• Modbus TCP, BACnet IP, Modbus RTU/BACnet MSTP, I/O 


Optional:

Differential pressure measurement for filter

Windis Free 350 - Air Curtain for Open-Space Installation

Technical Information and Downloads


finnish ​​ ​ ​ ​ ​ ​​

english ​ ​ ​ ​ ​​

Dimensional drawing​ ​ ​​ ​​

Functional drawing ​(finnish)​​ ​ ​


suomi ​​ ​ ​ ​ ​ ​ ​


englanti ​ ​ ​ ​ ​ ​

Modbus registers ​ ​ ​​

Instructions for changing settings​ ​

MagiCAD​ ​ ​

Declaration of conformity ​ ​​ ​


Windis Ceil 350 - Air curtain unit for integrated installation

The water-circulated Windis Ceil 350 is an air curtain designed for suspended ceiling installation, making it an excellent choice for retail premises, offices, schools, and daycare centres.

The unit can be installed at heights of up to 3.5 metres and is available in four different widths: 1 m, 1.5 m, 2 m, and 2.5 m.

An integrated controller is included as standard, which can be connected to a building automation system.

More than just an air curtain – a solution that adds value to the entire building.

Our units are designed to provide comfortable conditions and reduce energy consumption.

Performance

Integrated thermal energy measurement

Adjustable discharge impulse

High-performance EC fans

Quick Installation

Quick connectors for external sensors

Integrated heating valve

Features

Modbus TCP and BACnet IP interface

Heating network pressure monitoring

Built-in frost protection detection

Windis Ceil 350 - Air curtain unit for integrated installation

Scope of deliveryTechnical SpecificationsWindis Ceil - 350 - 250 (Width: 2,5m)Windis Ceil - 350 - 200 (Width: 2,0m)Windis Ceil - 350 - 150 (Width: 1,5m)Windis Ceil - 350 - 100 (Width: 1,0m)

Windis Ceil - 350 - 100 (Width: 1,0m)

Air flow: 1912 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 7,51 kW
  • Water flow: 0,061 l/s
  • Pressure drop: 2 kPa

50/30 °C water: 

  • Power: 6,98 kW
  • Water flow: 0,084 l/s
  • Pressure drop: 2 kPa

Electric power: 333 W

Sound pressure: 

  • 73 dB (10 m² Sabine)
  • 60 dB (5m equivalent absorption area measured at a distance (200 m²)



Windis Ceil - 350 - 150 (Width: 1,5m)

Air flow: 2750 m³/h

Air inlet: 18 °C

60/30 °C water:

  • Power: 13,88 kW
  • Water flow: 0,112 l/s
  • Pressure drop: 4 kPa

50/30 °C water:

  • Power: 12,12 kW
  • Water flow: 0,135 l/s
  • Pressure drop: 6 kPa

Electric power: 502 W

Sound pressure: 

  • 76 dB (10 m² Sabine)
  • 63 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Ceil - 350 - 200 (Width: 2,0m)

Air flow: 3650m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 14,52 kW
  • Water flow: 0,118 l/s
  • Pressure drop: 2 kPa

50/30 °C water:

  • Power: 13,54 kW
  • Water flow: 0,164 l/s
  • Pressure drop:: 2 kPa

Electric power: 666 W

Sound pressure: 

  • 76 dB (10 m² Sabine)
  • 63 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Ceil - 350 - 250 (Width: 2,5m)

Air flow: 5055 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 22,82 kW
  • Water flow: 0,184 l/s
  • Pressure drop: 3 kPa

50/30 °C water:

  • Power: 20,26 kW
  • Water flow: 0,244 l/s
  • Pressure drop: 4 kPa

Electric power: 666 W

Sound pressure: 

  • 77 dB (10 m² Sabine)
  • 64 dB (5m equivalent absorption area measured at a distance (200 m²)

Technical Specifications

Color:

​• Underside (visible face): RAL 7035

​• Grille: RAL 7024

​• Other RAL colours available on request


Fan:

​• EC centrifugal fans, ball bearings


Heating coil:

​• Copper tubes 3/8", aluminium fins, max 6 bar / 100°C


Electrical Connections:

​• Power supply: 2 m safety-earthed plug


Other connections: M12 connectors, Ethernet, USB

Scope of Delivery

Integrated inside the unit:

​• Energy meter (ultrasonic flow measurement)

​• 2-way heating valve, Belimo C215Q-J / C220Q-K

​• Actuator with 15 s operating time

​• Discharge impulse control

​• Water inlet and outlet temperature measurement

​• Air inlet and outlet temperature measurement

​• Frost protection detection

​• Heating network pressure measurement

​• Air bubble detection

​• G4 filter

Communication interfaces::

​• Modbus TCP, BACnet IP, Modbus RTU/BACnet MSTP, I/O 


Optional:

Differential pressure measurement for filter


Windis Ceil 350 - Air curtain unit for integrated installation


Technical Information and Downloads


finnish ​​ ​ ​ ​ ​ ​



Dimensional drawing​ ​ ​​ ​​

Functional drawing ​(finnish)​​ ​ ​


finnish ​​ ​ ​ ​ ​ ​ ​


english ​ ​ ​ ​ ​ ​

Modbus registers ​ ​ ​​

Instructions for changing settings​ ​

MagiCAD ​

Declaration of conformity ​ ​​ ​


Windis Vertical 350 - Vertically mounted air curtain unit

Windis Vertical 350 is an air curtain designed for vertical installation, well suited to commercial premises and industrial sites.

The recommended door opening width is 5 m when units are installed on both sides of the door. The unit is available in four widths: 1 m, 1.5 m, 2 m, and 2.5 m. Units can be stacked.

An integrated controller is included as standard, which can be connected to a building automation system.

Also available in stainless steel

More than just an air curtain – a solution that adds value to the entire building.

Our units are designed to provide comfortable conditions and reduce energy consumption.

Performance

Integrated thermal energy measurement

Adjustable discharge impulse

High-performance EC fans

Quick Installation

Quick connectors for external sensors

Integrated heating valve

Features

Modbus TCP and BACnet IP interface

Heating network pressure monitoring

Built-in frost protection detection

Windis Vertical 350 - Vertically mounted air curtain unit

Windis Vertical - 350 - 100 (width: 1,0m)Windis Vertical - 350 - 150 (width: 1,5m)Windis Vertical- 350 - 200 (width: 2,0m)Windis Vertical - 350 - 250 (width: 2,5m)Technical SpecificationsScope of delivery

Windis Vertical - 350 - 100 (width: 1,0m)

Air flow: 1692 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 6,80 kW
  • Water flow: 0,055 l/s
  • Pressure drop: 2 kPa

50/30 °C water: 

  • Power: 6,42 kW
  • Water flow: 0,077 l/s
  • Pressure drop: 2 kPa

Electric power: 333 W

Sound pressure: 

  • 73 dB (10 m² Sabine)
  • 60 dB (5m equivalent absorption area measured at a distance (200 m²)



Windis Vertical - 350 - 150 (width: 1,5m)

Air flow: 2433 m³/h

Air inlet: 18 °C

60/30 °C water:

  • Power: 12,80 kW
  • Water flow: 0,103 l/s
  • Pressure drop: 4 kPa

50/30 °C water:

  • Power: 11,17 kW
  • Water flow: 0,135 l/s
  • Pressure drop: 5,03 kPa

Electric power: 502 W

Sound pressure: 

  • 76 dB (10 m² Sabine)
  • 63 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Vertical- 350 - 200 (width: 2,0m)

Air flow: 3230 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 13,24 kW
  • Water flow: 0,106 l/s
  • Pressure drop: 2 kPa

50/30 °C water:

  • Power: 12,44 kW
  • Water flow: 0,15 l/s
  • Pressure drop: 2 kPa

Electric power: 666 W

Sound pressure: 

  • 76 dB (10 m² Sabine)
  • 63 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Vertical - 350 - 250 (width: 2,5m)

Air flow: 4473 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 21,04 kW
  • Water flow: 0,170 l/s
  • Pressure drop: 2 kPa

50/30 °C water:

  • Power: 18,70 kW
  • Water flow: 0,226 l/s
  • Pressure drop: 3 kPa

Electric power: 666 W

Sound pressure: 

  • 77 dB (10 m² Sabine)
  • 64 dB (5m equivalent absorption area measured at a distance (200 m²)

Technical Specifications

Color:

  • Casing: RAL 7035
  • Grille: RAL 7024
  • Other RAL colours available on request

Fan: 

  • EC centrifugal fans, ball bearings

Heating coil:

  • Copper tubes 3/8", aluminium fins, max 6 bar / 100°C

Electrical Connections:

  • Power supply: 2 m safety-earthed plug
  • Other connections: M12 connectors, Ethernet, USB

Scope of Delivery

Integrated inside the unit:

  • Energy meter (ultrasonic flow measurement)
  • 2-way heating valve, Belimo C215Q-J / C220Q-K
  • Actuator with 15 s operating time
  • Discharge impulse control
  • Water inlet and outlet temperature measurement
  • Air inlet and outlet temperature measurement
  • Frost protection detection
  • Heating network pressure measurement
  • Air bubble detection
  • G4 filter

Modbus TCP, BACnet IP, Modbus RTU/BACnet MSTP, I/O Communication interface

Optional:

  • Differential pressure measurement for filter


Windis Vertical 350 - Pystyasenteinen ilmaverhokone

Technical Information and Downloads


finnish ​​ ​ ​ ​ ​ ​



Dimensional drawing​ ​ ​​ ​​

Functional drawing ​(finnish)​​ ​ ​


finnish ​ ​ ​ ​ ​ ​


english ​ ​ ​ ​ ​ ​

Modbus registers ​ ​ ​​

Instructions for changing settings​ ​

MagiCAD​​

Declaration of conformity ​ ​​ ​


Windis Free 500 - Air Curtain for Open-Space Installation

The water-circulated Windis Free 500 is designed for open-space installation and is an excellent choice for retail premises, logistic centers and industrial buildings.

The unit can be installed at heights of up to 5 metres and is available in four different widths: 1.5 m, 2 m, and 2.5 m.​

An integrated controller is included as standard, which can be connected to a building automation system.

Also available in stainless steel

More than just an air curtain – a solution that adds value to the entire building.

Our units are designed to provide comfortable conditions and reduce energy consumption.

Performance

Integrated thermal energy measurement

Adjustable discharge impulse

High-performance EC fans

Quick Installation

Quick connectors for external sensors

Integrated heating valve

Features

Modbus TCP and BACnet IP interface

Heating network pressure monitoring.

Built-in frost protection detection

Windis Free 500 - Air Curtain for Open-Space Installation

Windis Free - 500 - 150 (Width: 1,5m)Windis Free - 350 - 200 (Width: 2,0m)Windis Free - 350 - 250 (Width: 2,5m)Technical SpecificationsScope of delivery

Windis Free - 500 - 150 (Width: 1,5m)

Air flow: 3900 m³/h

Air inlet: 18 °C

60/30 °C water:

  • Power: 21,24 kW
  • Water flow: 0,171 l/s
  • Pressure drop: 4 kPa

50/30 °C water:

  • Power: 18,50 kW
  • Water flow: 0,223 l/s
  • Water flow: 6 kPa

Electric power: 690 W

Sound pressure: 

  • 84 dB (10 m² Sabine)
  • 71 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Free - 350 - 200 (Width: 2,0m)

Air flow: 5200 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 22,46 kW
  • Water flow: 0,182 l/s
  • Pressure drop: 2 kPa

50/30 °C water:

  • Power: 20,84 kW
  • Water flow: 0,252 l/s
  • Pressure drop: 2 kPa

Electric power: 920 W

Sound pressure: 

  • 87 dB (10 m² Sabine)
  • 74 dB (5m equivalent absorption area measured at a distance (200 m²)

Windis Free - 350 - 250 (Width: 2,5m)

Air flow: 5900 m³/h

Air inlet: 18 °C

60/30 °C water: 

  • Power: 25,18 kW
  • Water flow: 0,202 l/s
  • Pressure drop: 3 kPa

50/30 °C water:

  • Power: 22,36 kW
  • Water flow: 0,270 l/s
  • Pressure drop: 5 kPa

Electric power: 1080 W

Sound pressure: 

  • 91 dB (10 m² Sabine)
  • 78 dB (5m equivalent absorption area measured at a distance (200 m²)

Technical Specifications

Color:

  • Casing: RAL 7035
  • Grille: RAL 7024
  • Other RAL colours available on request

Fan: 

  • EC centrifugal fans, ball bearings

Heating coil:

  • Copper tubes 3/8", aluminium fins, max 6 bar / 100°C

Electrical Connections:

  • Power supply: 2 m safety-earthed plug
  • Other connections: M12 connectors, Ethernet, USB

Scope of Delivery

Integrated inside the unit:

  • Energy meter (ultrasonic flow measurement)
  • 2-way heating valve, Belimo C215Q-J / C220Q-K
  • Actuator with 15 s operating time
  • Discharge impulse control
  • Water inlet and outlet temperature measurement
  • Air inlet and outlet temperature measurement
  • Frost protection detection
  • Heating network pressure measurement
  • Air bubble detection
  • G4 filter

Communication interfaces:

Modbus TCP, BACnet IP, Modbus RTU/BACnet MSTP, I/O

Optional:

  • Differential pressure measurement for filter


Windis Free 500 - Air Curtain for Open-Space Installation

Technical Information and Downloads


finnish ​​ ​ ​ ​ ​ ​


Dimensional drawing​ ​ ​​ ​​

Functional drawing ​(finnish)​​ ​ ​


finnish ​ ​ ​ ​ ​ ​


english ​ ​ ​ ​ ​ ​

Modbus registers ​ ​ ​​

Instructions for changing settings​ ​

MagiCAD​

Declaration of conformity ​ ​​ ​


Windis Zero - Liquid-loop heat recovery

Windis Zero is a patented heat-recovery control system designed for liquid-coupled heat-recovery coils in air handling units (AHUs). It ensures optimal fluid circulation, maximizing energy savings and heat-recovery performance.

Windis Zero can be installed in both new and existing AHUs, regardless of manufacturer. The system works wherever the AHU uses liquid-coupled heat recovery, making it a versatile and flexible solution for improving energy efficiency.

 Windis Zero is also a solution for systems with multiple exhaust-air coils.

Windis Zero is suitable for managing heat-recovery groups with several exhaust-air coils. In multi-coil systems, the delivery includes, by default, two-way control valves that measure the heat-transfer fluid (brine) flow from each exhaust-air coil separately.

Low operating costs

The heat-recovery efficiency remains high even in severe sub-zero conditions. Efficiency does not stall, and the need for auxiliary heating stays low.

Fast installation

A factory-built and tested package reduces time and effort on site. 

Versatile solution

Windis Zero can be installed regardless of the AHU manufacturer. An excellent choice especially for retrofit projects.

Windis Zero - Liquid-loop heat recovery

Automation interfaces
Pipe sizesScope of delivery

Scope of Delivery

  • Pump with variable frequency drive (VFD)
  • 3-way changeover valve
  • 3-way energy valve
  • Water-side temperature sensors
  • Water-side pressure sensor
  • Expansion & filling assembly
    • Expansion vessel
    • Safety (relief) valve
    • Fill valve
    • Pressure gauge with isolating valve
  • Air-side differential pressure sensor (supplied loose)
  • Piping in P235R grade, protective coated and insulated with 13 mm elastomeric foam


Pipe sizes

Flow rate (l/s)
Pipe size (DN)

0,2

20

0,3

25

0,5

32

0,7

40

1,250
265
2,880
4,8100


Automation interfaces

Windis Zero is supplied with a pre-programmed controller that can be connected to a building automation system using the following protocols:

  • Modbus RTU
  • Modbus TCP
  • BACnet MSTP
  • BACnet IP
  • I/O – run enable, cooling enable, 0–10 V setpoint, alarm

Windis Zero - Liquid loop heat recovery

Technical Information and Downloads


finnish ​​ ​ ​ ​ ​ ​ ​​

swedish ​ ​ ​ ​ ​ ​

functional diagram ​ ​​​ ​ ​​

functional diagram 
with changeover valve ​ ​​

finnish ​​ ​ ​ ​ ​ ​ ​

swedish ​ ​ ​ ​ ​ ​

wi​ring diagram ​ ​ ​ ​ ​

Modbus registers ​ ​ ​ ​​



Windis KVY - Emergency water supply (Break-tank)

Windis KVY — Emergency Water Supply (Break-Tank) Unit Windis KVY secures continuous water supply to critical equipment and systems in all conditions. The system protects against mains disruptions, sudden outages and contamination, safeguarding operational reliability when it matters most.

Flexible and Tailored Solutions Each unit is engineered and sized to project-specific requirements. Whether securing the supply for an entire property or for individual devices and branches, the solution is adapted to the need. ​

Versatile Applications ​

Our unit is particularly well suited for:

  • Food-industry production lines
  • Emergency showers and other critical draw-off points
  • Fire hydrant and hose-reel systems
  • Maintaining building water-supply networks

Comprehensive Turnkey Delivery ​

We deliver a complete solution from design and sizing through to system delivery. The break-tank capacity is defined case by case to ensure an optimal, cost-effective configuration. ​

Additionally, when required, the unit serves as an efficient pressure-boosting set, ensuring reliable water pressure even in demanding sites.

Contact us to secure your critical water supply.




Windis KVY - Emergency water supply (Break-tank)

Technical Information and Downloads


Functional diagram​ ​ ​ ​ ​