What is intermittent extract and how does it work?
Intermittent Extract is a classic method of ventilation and identified as System 1 in the Building Regulations. The provision of ON-OFF ventilation through 'in room' extractorfans - bathrooms, kitchens WC's etc and background ventilators located in windows and walls.
System 1 is recognised as Energy Neutral in SAP, however Guaranteed Installed Performance is high on the agenda with this type of system and onsite testing is increasing.
Building Regulation Requirements ADF : 2010
The Building Regulations ADF:2010 set out the requirements for intermittent ventilation are detailed in the table below.
They are based on aiflow performance requirements for specific room types: