Kitchen Extraction Ductwork & Grease Cleaning

Ductwork Cleaning & Grease Extraction

The greatest potential fire risk in buildings with catering facilities comes from the accumulation of grease-laden deposits in extract ventilation systems, a fire authority representative has warned at an industry seminar recently. Grease extract ductwork often stretches through the entire length of a building reaching to a roof level exhaust, so uncleaned ductwork can put not only the occupants at risk from fire but also the whole premises. 

Although filters in canopies help trap some grease particles it is inevitable that some grease-laden air will pass through, allowing grease deposits to cool and settle on the internal surfaces of the ductwork. Apart from the fire risk, the accumulation of grease in the kitchen extract system reduces ventilation efficiency by restricting the movement of extracted air, resulting in over-heating, excessive humidity, possible failure to remove noxious fumes from gas-burning appliances and a continuing source of unwanted odours which can permeate the rest of the building.

The Fire Safety Order requires owners and managers of buildings to ensure the Grease Extract Ventilation System is included in the Fire Risk Assessment and action taken to eliminate any potential risk to building occupants from potentially fire hazardous grease deposits in the ducting.

Section 7 of TR/19 (Specific Considerations for Kitchen Extract Systems) provides specific guidance on how often systems should be cleaned. Please see table below. Section 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 occupants/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 12 monthly

The canopy and canopy/extract plenum is an area of higher fire risk and consideration should be given to more frequent cleaning in accordance with insurers’ requirements ,at Tradition we can carry out service contracts on filters, canopies & plenums to ensure compliance


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0207 231 5888

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