CoolStream T evaporative cooling and ventilation system with heat reclaim

CoolStream T provides low-cost evaporative cooling (adiabatic cooling) and ventilation principally for larger industrial and commercial premises. It has been hygienically tested and certified to VDI 6022.

The CoolStream T evaporative cooler helps keep larger internal spaces pleasantly 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

Cooling, ventilation and heat reclaim within one system

CoolStream T is an enhanced input ventilation system, which means it can be used in spring and summer with the cooling function only being operated when conditions dictate. Excess heat is normally removed at high level via natural ventilators, providing a pleasant temperature in the internal space.

CoolStream T reduces heating costs

It also includes the option of heat reclaim. If there is enough heat in the building, it can provide heating via recirculation all year round. If it is cooler outside and some additional heat is needed, the fresh outdoor air is mixed with the warm air within the building. The supply air then ensures a pleasant temperature. This method of making use of the warmer air at high level reduces the heating bill considerably. Two infinitely variable actuators control the proportion of air that is recirculated.

Installation and commissioning

The unit is plug and play: this reduces installation costs and simplifies commissioning and service. Compared to the CoolStream A all the components are accessible from the roof.

Features and benefits

  • High evaporative cooling efficiency - low running costs. Only consumes about 1 kW per 2.8 m³/s (10,000 m³/h) cooled air, providing up to 30 kW of cooling.
  • Heat reclaim function reduces heating costs
  • EC fans (fitted as standard) boost efficiency
  • Variable speed controls boost efficiency by only providing the airflow that is needed
  • Simple and reliable technology – thus low maintenance costs
  • All components accessible from the roof
  • Durable: corrosion-resistant aluminium housing with powder coated water tray and water distribution system
  • 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
  • Controlled by highly intuitive and simple Colt Cortiva controls, either through a web browser or as an app on a smart phone or tablet
  • Additional destratification by a Colt Wastemaster system boosts the heat reclaim.
  • Designed and manufactured by Colt.

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.

Simplicity of controls

Colt Cortiva is easy to use and, most significantly, available via a tablet PC or a smart phone. It requires no special knowledge to configure the HVAC system or to make changes to the individual parameters.

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.

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



Highly efficient evaporative cooling (adiabatic cooling) system, using the principle of evaporative cooling to provide cooled air as part of a balanced ventilation system, in situations where conventional air conditioning is not cost-effective. Incorporates heat reclaim. All components on the roof.

Uses full fresh air to maintain good air quality, with integrated water quality control system. Tested to VDI 6022 with an HVAC hygiene certificate. Incorporates a low energy EC fan. Suitable for connecting to an air handling / input system.


  • 12A: Axial up to 3.3 m³/s (12,000 m³/h)
  • 15C: Centrifugal up to 4.2 m³/s (15,000 m³/h)
  • 17A: Axial up to 4.7 m³/s (17,000 m³/h)
  • 22A: Axial up to 6.1 m³/s (22,000 m³/h)
  • 23C: Centrifugal up to 6.4 m³/s (23,000 m³/h)
  • 30A: Axial up to 8.3 m³/s (30,000 m³/h)


Colt Cortiva controller via browser or app.

Filter options

Single stage: Z-line filter class G4, M5 or F7.
Two stage: Z-line filter G2+F9

VDI certification (optional)

Internal lighting / light switch, sight glass, pressure display, VDI 6022 certificate.

Other products in the CoolStream range include:

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