Flexibox
Free Cooling

Free Cooling for Telecom shelters, enclosures and rooms

Dantherm's Free Air Cooling unit, the Flexibox, provides total heat management. Furthermore, the units generate energy cost savings of up to 90 % on cooling in Telecom sites hosting GSM, UMTS or LTE networks.

Free Cooling is cost-effective controlled ventilation: The Telecom shelter or enclosure is cooled by means of ambient air without a compressor.

All of the Dantherm Free Cooling products operate with overpressure delivering filtered air into the room, thereby ensuring a clean environment for the radio transmission equipment.

Flexible, quality-minded cooling solutions
Dantherm offers five Flexibox solutions ranging in capacity from 3-8 kW at delta t 10°C. The newly launched 5th generation features a built-in controller and is for outdoor mounting only. The other generations are for both indoor and outdoor mounting. The Flexibox is available for both AC and DC power, allowing for effective emergency cooling.

The Flexibox as the sole cooling solution is adequate for cooling Telecom base stations in most climate conditions. In warm climates and in climates with high temperature peaks, a combination of free cooling and an air conditioner is a good choice.

The combination prolongs the service life of your existing air conditioner and generates significant energy savings, when the free cooling is active.

  • Flexibox Free Cooling Solution by Dantherm Dantherm Flexibox 400
  • Dantherm Flexibox Free Cooling Solution Dantherm Flexibox 450
  • Dantherm Flexibox Free Cooling Solution Dantherm Flexibox 1100
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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
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Flexibox Free Cooling
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Flexibox
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Dantherm Flexibox CAPACITIES1100450450400
Voltage AC or DC DC DC DC DC
Voltage 48 24 48  48
Capacity in kW
at Δt = 10°C
11.1 8.2 7.8  4.8
Max air flow m³/h 3,300 2,490 2,333  1,440
Net weight in lbs [kg]

75
[34]

48.5
[22]
48.5
[22]
39.7
[18]
DANTHERM FLEXIBOX FEATURES1100450400
Automated change of cooling modes Energy-optimized cooling algorithm Dantherm's free cooling solutions are total heat management systems. Climate units are controlled via the Dantherm controller, to maintain the desired temperature - the most energy-optimized way. bullet bullet bullet
Free Cooling Savings Saves up to 90% energy compared to traditional cooling systems. bullet bullet bullet
Active cooling: Control of up to 2 external air conditioners bullet bullet bullet
Heating: Control of external heater bullet bullet bullet
Emergency Cooling in case of overheating Redundant Cooling Safety If the indoor temperature rises above set point, the unit assumes malfunction of the Air Conditioner and initiates maximum cooling, to ensure site up-time. bullet bullet bullet
Emergency Cooling in case of AC mains failure Emergency cooling - ensures site uptime When detecting AC mains fall out or failure, free cooling will take over, to ensure sufficient cooling and follow a low energy consumption strategy. Power is drawn from batteries, to prolong site uptime and prevent site overheating. bullet bullet bullet
Installation  1100 450 400
Outdoor installation  bullet bullet bullet
Indoor installation    bullet bullet
Through-wall installation    bullet bullet
Door/floor or ceiling installations    bullet bullet
Controller type - Dantherm Flexibox  1100 450 400
Dantherm CC4 Controller for 48 V DC       
Dantherm ACUE 3000 Controller for 24 and 48V DC  bullet  bullet bullet
Communication Interfaces - Dantherm Flexibox  1100
450 400
SD Card reader for change of settings and logging       
LCD Display directly on the controller bullet  bullet bullet
Display for connection to the controller      
RS 232 cable connection for laptop or remote monitoring For Dantherm Remote Climate Control And integration into Customer SNMP systems, on-site installation and maintenance support via Laptop. bullet  bullet bullet
RS 484 cable connection for laptop or remote monitoring Title Enables remote monitoring and integration into Customers SNMP systems, on-site installation and maintenance support via Laptop.      
Controller features - Dantherm Flexibox 1100 450 400
Stepless and adapatable fan control Optimal temperature Continuous regulation of the fan for optimal temperature at minimal energy consumption. Low running costs with energy-efficient, stable cooling. Prolongs fan service life. bullet  bullet bullet
Control of up to two Flexibox units Extendable solution Ability to double the cooling capacity on each site / controller. bullet  bullet bullet
Control of up to two external air conditioner units Ensures site uptime Redundancy in case of high ambient temperatures. Ensures site uptime. bullet  bullet bullet
Heater control External heater External heater controlled with on/off signal. Adjustable set points. Energy-saving security measure: Ensures that all temperature regulating devises are coherent. bullet  bullet bullet
External air conditioner exercise Prolongs air conditioner service life If the air conditioner has been inactive, it will be activated every 10 days for 5 min. Ensures operational reliability and prolongs external air conditioner service life - in some cases from 5 to 7-8 years. bullet  bullet bullet
Filter monitor Surveillance Surveils differential pressure over filter to signal that filter change should be planned in. bullet  bullet bullet
Self test function Easy installation and service Self test is activated directly from the control panel. At installation and service: operation-essential functions are checked for correct operation. Quality assures installation and service. bullet  bullet bullet
Log of arms in controller Log of alarms The controller will log any alarms. The recent 200 occurred alarms will be accessible directly on the display or for download to Laptop / surveillance system. bullet  bullet bullet
Log of alarms on SD Card Log of alarms on SD Card An active alarm will be shown on the optional display and logged on the optional SD Card - to give a history log.        
Changeable parameters - Dantherm Flexibox 1100 450 400
Cooling set point bullet  bullet bullet
Heating set point bullet  bullet bullet
High and low temperature alarms bullet  bullet bullet
Filter guard bullet  bullet bullet
NO/NC alarm in- and outputs with pins bullet  bullet bullet
Safety and Surveillance - Dantherm Flexibox 1100 450 400
Fan surveillance of rpm and power consumption bullet  bullet bullet
Potential free alarm outputs Customized Four potential free relay alarm outputs. Can send customized alarm output to own system. bullet  bullet bullet
High/low temperature alarm bullet  bullet bullet
Filter guard alarm output Service visit reminder Issues a filter change signal, i.e. if the filter is clogged. Ensures operational reliability and allows planning of service visits within 1 month. bullet  bullet bullet
Applications
  • Telecom shelters
  • DC Powered Sites
  • Radio base stations
  • Electronics enclosures
  • Hybrid Telecom Sites
  • Automation control cabinets
  • Drive stations
  • Network & computer rooms
  • Power supply rooms
Features and Benefits

Dantherm Flexibox 400, 450 and 1100.

  • Extremely energy-efficient: Savings of up to 90% compared with traditional cooling solutions.
  • Total heat management: Control of external AC-units, heater, motorized dampers and surveillance.
  • Stepless fan speed control with surveillance - low running costs and stable operation.
  • Flexibox equals flexible installation at new and legacy sites.
  • Optional surveillance system.


  • Flexibox free cooling by Dantherm Free cooling - Flexibox detail of front service panel.
  • Flexibox free cooling by Dantherm Dantherm Flexibox for free cooling - detail of wiring.
  • Flexibox free cooling by Dantherm Free Cooling - Dantherm Flexibox for free cooling - detail of filter guard and fan.
  • Flexibox free cooling by Dantherm  Free cooling - Flexibox detail of easily serviced and large panel F5 filter.
  • Flexibox free cooling by Dantherm Dantherm Flexibox for free cooling - detail of through wall mounting plate.
  • Flexibox free cooling by Dantherm The Square motorized damper is used to control the air streams in a room or shelter - when utilizing free air cooling.
  • Flexibox free cooling by Dantherm The motorized damper for Flexibox air outlet ensures control of airstreams in when utilizing free air cooling.
  • Flexibox free cooling by Dantherm Wall display for Dantherm's controllers in the CC family: CC1-4. The display show in clear symbols status and eventual alarms. Settings can be changed directly from the display.
  • Flexibox free cooling by Dantherm ACUE 3000 controller for Dantherm Flexibox 400, 450, and 1100, all powered by 24 or 48V DC. The ACUE controller is a total heat management controller for energy optimized cooling - it takes control of free cooling, emergency cooling, dampers, air conditioners, heater etc. to acheive the set temperature using minimum power.
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Product Data Sheets Flexibox Product Data Sheets Controllers