B&ES (formerly HVCA) TR/19 Regulations.

Section 7: Frequency of Cleaning

Article 7.35

The need for specialist cleaning of extract systems will depend on the level of usage of the cooking equipment, types and quantity of cooking and other risk factors such as vulnerability of the system to ignition and of the building and its occupant/users to system fire, hygiene, vermin and mechanical hazards. Typical cleaning intervals are shown in Table 11:

Table 11: Frequency of Cleaning

Heavy Use 12-16 hours per day 3 monthly
Moderate Use 6-12 hours per day 6 monthly
Light Use 2-6 hours per day 12 monthly






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