The workplace, and the equipment and devices mentioned in these Regulations, should be maintained in an efficient state, in efficient working order and in good repair.
Mechanical ventilation systems shall be maintained (including cleaned as appropriate) in an efficient state, in efficient working order and in good repair.
Mechanical ventilation systems (including air-conditioning systems) should be regularly and adequately cleaned. They should also be properly tested and maintained to ensure that they are kept clean and free from anything which may contaminate the air.
Condition monitoring takes the surprise out of ventilation clean requirements and helps avoid expensive call out/shut down cleans