United Kingdom

CoolStream N natural cooling and ventilation system

CoolStream N provides low-cost evaporative / adiabatic cooling and ventilation principally for larger industrial premises with relatively high internal heat loads. It has been hygienically tested and certified to VDI 6022.

The CoolStream N evaporative cooler helps keep larger internal spaces cool all year round. It doesn’t need to cost the earth: using the cooling power of water, it’s possible to achieve low energy cooling.

Product information

Features and benefits

  • Low running costs: a huge potential geometric face area (maximum of 20 m2 per unit) and high aerodynamic efficiency allow a large amount of air to pass through one unit to cool the low-level working areas.
  • Modular design for easy installation which can fit into almost every type of wall.
  • Option of virtually silent EC fans to boost air flow and cooling capacity.
  • Simple and reliable technology – thus low maintenance costs
  • Durable: with a corrosion-resistant aluminium casing. All components that come into contact with water are powder coated.
  • High air quality: uses 100% outside air for cooling.
  • No refrigerants (e.g. CFCs) used for cooling which would be harmful to the environment.
  • Extensively tested hygienically in compliance with VDI 6022 (“Hygienic Requirements for Ventilation Systems and Units for Internal Spaces”). This is a rigorous standard for air conditioning systems and confirms the high quality of supply air.
  • Digital control with master/slave operation, standalone operation and optional bus protocol (Modbus). Option for fully automatic control, comfortable control of room temperature and touch screen operation for up to 16 CoolStream N units in conjunction with exhaust ventilators or integration into a higher-level control system.
  • Designed and manufactured by Colt.

Cooling and ventilation within one system

Fresh outside air is drawn in as the result of the natural thermal conditions within the building and passes through a wetted desorption medium and is cooled. The supply of cooled air at low level combined with removal of heat at high level via either natural or mechanical ventilators provide a pleasant temperature at the working area.

If the thermal movement is likely to be insufficient, the unit can also be equipped with continuously variable highly efficient EC fans.


CoolStream N is mounted into the façade of a building. A conventional weather louvre system is fitted onto the outside of the unit. It is only 425mm in depth, allowing installation into most kinds of buildings.

Modular design – flexibility in design and installation

Its modular design and high degree of pre-assembly facilitate installation. The modular system is available in 400 mm increments and up to 10 metres wide. It has four different heights between 666 mm and 2000 mm. Its largest standard geometric size is 20 m2. With only 425 mm overall depth and a wide variety of available paint finishes, the CoolStream N can be installed into most kinds of buildings.

Fan supported

If additional airflow is required, as an option CoolStream N units can be equipped with high-energy efficiency EC fans which provide the airflow the room needs. They operate independently from the conditions outside and operating at full variable speed, providing just the right amount of airflow.

How evaporative cooling systems work

By passing warm outdoor air across a desorption medium, energy is exchanged and a significant reduction in air temperature is achieved. The warmer and drier the outdoor air, the more efficient the evaporative cooling process is.

Applications for CoolStream systems

Evaporative cooling systems provide an efficient and effective alternative to conventional air conditioning, particularly with those industrial and semi-industrial facilities which do not require an absolutely constant internal temperature at all times, and where these buildings are generally simply too large for conventional air conditioning to be cost-effective.

Energy and water efficient

Evaporative cooling systems are up to seven times more efficient than conventional air conditioning systems and infact the warmer the outside air, the more efficient the evaporative cooling process is.

Safe and environmentally friendly

Colt CoolStream evaporative cooling systems are designed to ensure optimal water quality. They have been hygienically tested and certified to VDI 6022, ensuring peace of mind that they are safe.

Cooling tailored to the building

We can advise on all aspects of the ventilation design. We provide stress-free project management and service and maintenance. Read more about our services.

Please contact us for more information relating to the application, specification, installation or servicing of CoolStream systems.



Highly efficient evaporative cooling system for the façade. Provides cooled air as part of a balanced natural ventilation system, to keep the indoor climate cool. Uses only fresh outside air. Has an integrated water quality control system, and has been tested to the VDI 6022 hygiene standard. Can incorporate optional EC fans to boost air flow and cooling capacity if required. For combination with natural façade ventilators.

Size options


  • From 800 mm up to 9600 mm overall in 400 mm steps.


  • Four overall heights are available: 666 mm, 1000 mm, 1333 mm and 2000 mm.
  • Maximum geometric face area 20 m2

Fan options

  • Natural cooling (no fans)
  • High-efficiency low noise variable 0-100% speed EC fans

Controls options

Touch screen controls, temperature and humidity options, BMS connections (ask Colt for further info)

Other options/ accessories

Two different pump sizes for different installation heights and free areas

Product video

Additional Links

Other products in the CoolStream range include:

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