Fire regulations cover the cleaning of Kitchen Grease extract systems, but little attention is paid to the ‘Supply ventilation’ to kitchens and food preparation areas. If the Supply ventilation is not cleaned and maintained this can lead to food contamination. Ventilation cleaning comes under H&S Executive Order 1995 which states that the ‘internal working of a ventilation system must be maintained & cleaned’. The standards of cleanliness are found within the BS EN15780-2011, which relates to dust particulate testing, see Table on Page 10. EC 852/2004 covers the regulations on Hygiene of Foodstuffs.