To comply with their legal duties employers and those with responsibilities for the control of the premises should
• Identify and assess sources of risk
• Prepare a scheme for preventing or controlling the risk
• Implement and manage precautions
• Keep records of the precautions
• Appoint a person to be managerially responsible

BS6700
This standard specifies requirements for and gives recommendations on the design, installation, alteration, testing and maintenance of services supplying water for domestic use within buildings.

ACOP 33 / HVAC TR17/19
The workplace (Health, Safety and Welfare Regulations 1992) regulation 6, imposes a duty to clean mechanical ventilation systems “as appropriate”. These Regulations are accompanied by an Approved Code of Practice or ACOP in order to assist the persons responsible with the implementation of the regulation.

ACOP 33 states: “Mechanical ventilation systems (including air conditioning systems) should be regularly and properly cleaned tested and maintained to ensure they are kept clean and free from anything which may contaminate the air”.

The ACOP therefore calls for regular cleaning and testing. Many of the countries’ leading building management organisations have published documents detailing methods of implementing this ACOP. These include:
• BSRIA TN/18/92
• HCVA TR19 (TR17)
• CIBSE TM26

The most commonly used of these is the HVCA TR19 & CIBSE TM26