EDC Fast Facts 19: Domestic Demand Controlled Ventilation (DCV).

DCV systems continuously monitor indoor air quality, measuring humidity levels via mechanical humidity strips on the inlet vents and air terminals. By doing this it provides occupants the required amount of fresh air when and where it is required.

Air is extracted, via a ducted system, from the wet rooms (kitchen, bathroom, utilities room, WC) back to the DCV unit. In habitable rooms (living room, bedroom) a wall or window mounted inlet controls the fresh air intake of the dwelling.

The vents operate based on the relative humidity present in the room. When there is little humidity present the opening of the vent is at its least open, when higher rates of humidity are detected its fully open to remove high levels of moisture present in the air. The extract rates are capable of meeting the minimum high rate permitted in TGD Part F.

As humidity levels fluctuate daily so too does the DCV system ensuring that the flow rates are sufficient when humidity levels are high. The system runs in trickle mode when air quality is good. This ensures optimum ventilation throughout the home using the minimum energy to do so.

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Conor O'Driscoll

Cork Operations Manager

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