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Demand Controlled Ventilation

Demand-Controlled Ventilation (DCV) is a ventilation system designed to supply fresh, filtered air and extract stale, moist air. The system automatically boosts ventilation rates as required based on humidity levels.

  • Improves Indoor Air Quality

  • Eliminates Condensation & Mould

  • Reduces Thermal Loss

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How Does Demand Controlled Ventilation (DCV) Work?

A Demand Controlled Ventilation (DCV) system is equipped with a sensor which detects humidity levels and automatically adjusts the airflow rate based on the indoor air quality. If a room is heavily occupied, the humidity levels will be high - a DCV system will sense this and increase airflow into the room. If a room is unoccupied or humidity levels are low, the ventilation rate is reduced. Similarly, in wet rooms such as bathrooms, when there is an elevated level of humidity and moisture detected, the rate of extraction is boosted to adequately remove the moist, stale air.  


Benefits of DCV

  • Energy efficient – As a DCV system optimises airflow rates based on the indoor air quality, the ventilation rate varies. Therefore, the system only boosts ventilation rates when needed, increasing energy efficiency.  

  • Improves indoor air quality – Demand Controlled Ventilation supplies fresh, filtered air, and extracts stale moist air, improving indoor air quality.  

  • Eliminates mould and condensation – A DCV system ensures that the right amount of ventilation is provided to control the amount of moisture in the air, helping to eliminate condensation and mould.  

  • Reduces thermal loss – DCV supplies and extracts air as required. Therefore, rooms are not over ventilated when not in use, preventing cooler outside air replacing the warmer inside air.  

  • Complies with building regulations regarding ventilation. 

    What Type of Building is DCV Suitable For?

    Demand Controlled Ventilation is suitable for many different property types, including new or existing homes, offices, gyms, healthcare premises, hotels, schools and more.  

Installing Demand Controlled Ventilation


A DCV unit is usually located centrally in the roof space or in a cupboard space. The unit can be installed horizontally on the ceiling or vertically on a wall. The valves on the unit pivot to allow for flexibility when installing. 

Ducting is run from the unit to each supply/ extract valve. A DCV system needs to be carefully planned to ensure the valves are located in appropriate areas to detect humidity levels. Acoustic humidity controlled wall vents are fitted in living areas and ducted directly to the outside. Extract valves can be fitted in wet rooms, such as a bathroom, kitchen, or utility. 

Once a Demand Controlled Ventilation system has been installed, it requires testing and commissioning to validate system performance and this can be carried out by BEAM or by our countrywide network of Distributor partners.  


              DCV Unit                                      Fresh Air Vent                                     Extract Valve

DCV Unit Specification

Motor Voltage (V) Maximum Absorbed Power (W) Medium Absorbed Power (W) Maximum Absorbed Current (A) Sound Pressure Radied (Lp(a) at 1,5m. (dB(A) at 180m3/h and 140 Pa)
EC 230 54 15 0,4 30

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