Home Mechanical Ventilation Demand Control Ventilation (DCV)

Demand Control Ventilation (DCV)

Provide adequate rates of ventilation in your building based on humidity levels. 

  • Improves indoor air quality
  • Eliminates condensation & mould
  • Reduces thermal loss
Image of Demand Control Ventilation (DCV)
DCV system components

What is 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.

Beam Axco Ozeo DCV unit

How does 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 Demand Controlled Ventilation

Hands holding energy efficient house

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.

Man and woman breathing in clean fresh healthy indoor air

Improves indoor air quality

Demand Controlled Ventilation supplies fresh, filtered air, and extracts stale moist air on demand, improving indoor air quality.

Condensation on kitchen window

Eliminates mould & 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.

Building with woolly hat covering it

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.

Comply with regulations

Complies with building regulations

Demand Controlled Ventilation is a suitable option to meet ventilation requirements in new and existing buildings. 

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Installation of Demand Controlled Ventilation (DCV)

Beam Axco Ozeo DCV unit location

Unit Location

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 on floor of building under construction


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.

Beam engineer checking airflow with anemometer


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 Product Range

Axco Ozeo Demand Controlled Ventilation (DCV)

Axco Ozeo Demand Controlled Ventilation (DCV)

  • Humidity controlled
  • Whole house extract unit
  • Complies with Building Control requirements
Product Range

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