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Dantherm Flexibox 900 – free cooling unit
Dantherm Flexibox 900 – free cooling unit

Dantherm Flexibox 900 – free cooling unit

Free cooling

Free cooling is cost-effective controlled ventilation – the telecom shelter or enclosure is cooled by means of ambient air without a compressor. Dantherm’s Free Air Cooling unit, the Flexibox, provides total heat management and significant energy savings on cooling in telecom sites hosting GSM, UMTS or LTE networks.


Key features

  • Extremely energy-efficient – savings in all types of climates
  • Total heat management – control of multiple external units
  • Stable operation – stepless fan speed control
  • Clean internal environment – overpressure system
  • Extended air path protection – Dantherm AirMaze
  • Flexible installation – with variants for indoor and outdoor use
  • Low maintenance costs – long-life compact filter
  • Maximum security – remote monitoring and configuration
  • Integrated CC3000 control system for FB 900 units

Product specifications

Operating temperature range

-25 to +55

Maximum cooling capacity at 25°C ambient, Δt = 10°C, 100%


Air flow – maximum


Input voltage range

48VDC (42-57VDC)

Power consumption 50/80/100%


Sound level, 50/80% @ 3m




Communication interface

Ethernet SNMP

Product size outdoor (h x w x d)

758 x 503 x 500

Product size indoor (h x w x d)

666 x 455 x 472

Net weight

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Related products

Dantherm TKS 60 – high capacity free cooling unit
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High-capacity free cooling

TKS 60 is high-capacity free air cooling designed to control the internal environment of communication shelters using a minimum of energy.

Dantherm DFC 350-450 – displacement free cooling unit
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Displacement free cooling

The Dantherm DFC 350 and 450 are slim passive cooling units utilising the displacement free air cooling technology.

Featured insights

Insights Content telecoms cooling
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Discover how free cooling can help bring energy-saving upgrades to new and existing sites.

Photo of Tobias Netz
Tobias Netz 7 min read
Insights Content telecom cooling
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Why free cooling keeps electronic devices cool for less than traditional air conditioning systems

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Tobias Netz 8 min read
Dantherm telecoms cooling web
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Energy savings can be huge with our free cooling solutions

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Tobias Netz 7 min read

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