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Small close control systems used for the storage of delicate/high value products and materials such as archive rooms, paintings, musical instruments and pre-processed plastic materials.


  • Microprocessor controls: Control tolerance +/- 1°C, +/- 5%RH
  • Upflow or Downflow
  • Grille or ducted discharge and inlet airflows
  • DX split system or chilled water
  • Various filtration specification options
  • Class ‘O’ thermal and acoustic insulation
  • Direct drive, double inlet forward curved centrifugal fans available in 2 fan speeds
  • Twin circuit coil option
  • Electronically controlled fan speeds
  • Two stage electric heating
  • Humidification/Dehumidification with electronic control
  • Four pole mains isolator
  • Alarms:temperature/humidity out of limits, fan fail, CU fail
  • 3 phase - 400volts 50Hz supply voltage (some 1Ph options available)
  • Dirty filter indication
  • Matching condensing units factory charged with Dry Nitrogen
  • BACnet interface
  • Master Slave and auto change over

Marstair offer an extensive range of small close control systems (4-20kW) CD3. These flexible systems are extensively used for storage room applications requiring close temperature and humidity control. CD3 systems are manufactured to suit your specification incorporating cooling, heating, humidification and dehumidification facilities. The units are available in three cabinet sizes, manufactured in a powder-painted steel construction with an easy clean corrosion resistant drain tray and have a washable filter, a de-ice thermostat, a totally enclosed electrics panel and a choice of airflow configurations.