Extraction vs. Free Cooling

The technology behind Extraction and Free Cooling solutions are different in complexity. True Free Cooling is capable of generating significantly more savings and maintains a cleaner enclosed environment.

What is the difference between Extraction and Free Cooling?

Both systems are controlled ventilation and consist of the same basic components - fan, filter and a thermostat or controller.  But in practice, there are many differences in how the components are controlled and configured. 

Comparing the Two Technologies


Free Cooling
(Dantherm Flexibox)

Overpressure - making sure only filtered air enters the enclosed environment.   bullet
Underpressure - allowing air to enter through a filter, but also through any leakage in the room construction. bullet  
Filter at air entrance bullet bullet
Overpressure damper   bullet
Energy-optimized software implemented in control of the free cooling - see graph below...   bullet

Why Overpressure?

Free cooling (Dantherm Flexibox) utilizes an overpressure, which means that only filtered air enters the shelter.  In the event that any cracks or holes are present in the room/shelter, air will be blown out of these leakage areas - leaving a clean room/shelter with filtered air.

How important is the system controller? 

In our experience, the system controller can be the differentiator between adequate savings and immense savings.  The Dantherm-developed controllers combine our know-how of thermodynamics with the practical challenges of our customers.  In addition, this knowledge has been fine-tuned in the last 5 generations of our free cooling solutions.  In the example below, the fans were quite similar in capacity, but the controller made a huge difference.  

How important is the fan? 

Yes - choice of fan is very important and should be configured according to the cooling demand, how powerful the fan is and fan placement options at the site, to obtain sufficient air movement.

What is total heat management?

Our experience from years in the global Telecom industry is that sites are often equipped with systems from different cooling and heating vendors, and we have often seen the systems conflicting.  Therefore, Dantherm has made it our mission to combine existing systems with an intelligent, energy-saving control strategy.  In practice this shows its value in the example below, originating from our cooperation with a customer in South Africa (read full case story):

Africa Case Results

How Much Can
You Save?
How Much Can You Save? Calculation tool
Facts: Free Cooling
  • Energy savings of up to 90%
  • No need for inverter
  • Compact design
  • Mono-block units
  • Very high performance
  • Brushless DC motor
  • Weather-proof casing
  • Ideal for off-grid sites
  • Ideal for battery cooling
Flexibox Free Cooling
How does Flexibox work? Play
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