The Building Regulations L1A & L1B require that buildings are designed to be more air tight, thereby reducing CO₂ emissions and becoming more energy efficient. However, this removes a source of ventilation and if the installed ventilation system is not operating efficiently, then the building could attract damp and condensation issues, especially during prolonged periods where the windows are kept closed.

Part F of the Building Regulations introduced more stringent ventilation requirements for buildings and it is of equal importance that any installed ventilation systems are fit for purpose, balanced and commissioned correctly to ensure optimum levels of operation. Additionally, the regulations also state “there shall be adequate means of ventilation provided for people in the building”.

Part F of the Building Regulations requires that MHVR Systems (Mechanical Ventilation and Heat Recovery) and intermittent extractor fans (e.g. kitchen & bathroom) have their flow rates checked, are working efficiently and the relevant test results submitted to building control as part of the overall building compliance process.