Demand Controlled Ventilation (DCV)

What is DCV Demand Controlled Ventilation?

  • DCV systems change the air in a building by extracting waste condensate air and replacing it with fresh air from the atmosphere when required or on demand. It does not recover any heat from exhaust air.
  • A DCV system is a centralised constant volume extract fan with a duct going to each wet room including kitchen and utility. It will extract waste heat condensate air and odours through humidity sensitive valves in the ceiling, rooms with toilets will have a motion detector also, these valves will open and close depending on level of humidity and motion, meanwhile humidity sensitive passive vents are fitted to bedroom, living and dining room external walls, allowing air in from outside depending on humidity these passive vents open and close automatically, This replaces the air being extracted.
  • The bottom line is that DCV will make your home or business a healthy well ventilated environment for your family or employees as required and on demand without the need to open windows. Naturally this includes unwanted odours. The benefit of DCV is very noticeable in the classroom, You will literally notice a reduction in respiratory issues, colds and flu and improve concentration for pupils as air is more oxygenated.

Current Problems

  • For stricter regulations on Ventilation in Ireland, refer to the technical guidance document TGD Part F for building regulations.
  • Higher standards for airtightness and building fabric u values.
  • The average Family produces over 10 litres of water a day, not to mention cooking and clothes drying internally due to our climate.
  • Increasing incidence of chronic respiratory problems and hay fever.

The Solution: Demand Controlled Ventilation system (DCV).

DCV system operates by use of a constant volume extract fan, with ducts running to wet rooms, utility, kitchen and W.C. The ceiling valves will be humidity sensitive with motion detection for toilet rooms and will open and close on demand controlling the extract volume. meanwhile, humidity-sensitive passive vents are fitted to bedroom, living and dining room external walls, allowing air in from outside depending on humidity these passive vents open and close automatically, This replaces the air being extracted.