Energy efficient control damper for the use with constant pressure Fans.

The system is intended to provide continuous background ventilation when the served space is unoccupied and will automatically increase the ventilation rate when occupied to the design requirement.

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Quietest Systems -Nuaire’s unique integrated silencer means that your systems acoustic requirements both induct (suction side) and breakout are maintained whilst saving space on site.

  • Guaranteed ventilation – Automatic change over in the event of fan/motor failure, guaranteeing ventilation 24/7
  • Quiet Operation - Does not generate noise by throttling back on balancing dampers required in conventional systems
  • True Demand Ventilation - Only the areas requiring ventilation receive ventilation
  • Saves Energy - Up to 70% saving over conventionally controlled central systems - not needlessly extracting conditioned air - Fan speed/motor power dictated by demand requirement
  • 2 year warranty – Peace of mind

The vitiated air shall be extracted from the space using energy efficient constant pressure principle via a variable air volume motorised damper/grille installed in each area, as detailed in the schedule.

5 Sizes (100mm, 125mm, 150mm, 200mm diameters)

The extract fan shall automatically vary its speed as the system pressure varies; the variation in pressure is caused by the opening and closing of the Nuaire CVD extract damper. The damper is autonomous of the fan and requires no field wiring connecting it to the fan. The damper positions are open (boost) and closed (trickle). When the damper is closed, the grille will allow approx. 8 litres/sec flow rate, as background ventilation. The inline damper has an integrated airflow sensor which continuously monitors and controls the amount of air being moved. The air volume is adjusted via minimum and maximum potentiometers on the side of the CVD damper.

The duct mounted damper CVD requires a 230V connection/power supply. Signal from 230V switch live i.e. light switch, PIR, humidistat etc.

  • Integral operating pressure adjustment (target pressure).
  • BMS interface 0 - 10V.
  • Volt free run & failure/status indication.
  • 4no. low voltage sockets for interconnection of remote failure indicator.

Fan, integrated Ecosmart controls and associated sensors/controllers shall be manufactured by Nuaire.


  • Optional trickle/boost flow rate.
  • Externally adjusted settings.
  • CVD helps balance system.
  • Hotels
  • Student accommodation
  • NRG control grille
  • Humidity control
  • CVD Damper