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Guide

How often should kitchen extraction be cleaned?

TR19 frequency

Under BESA TR19 Grease, kitchen extract systems should be cleaned at least every 3 months for heavy use (12 to 16 hours a day), every 6 months for moderate use (6 to 12 hours) and every 12 months for light use (2 to 6 hours).

Why does grease matter?

Grease deposits inside ducts are a fire risk and can carry fire through the building. Mean deposits should stay below 200 microns, and anything at 500 microns or more needs cleaning straight away.

What does a TR19 report include?

Before-and-after photos, deposit measurements, a summary of work and any areas that could not be reached.

Do insurers check?

Many insurers expect cleaning to a recognised standard and may ask for reports, particularly after a fire.

Is filter cleaning enough?

No. Filters catch some grease, but the canopy plenum, ductwork and fan also collect deposits that only a full clean removes.

Can cleaning be done overnight?

Yes. Most kitchen cleans are done outside trading hours.

Ventilation Contractors technical team
Written for homeowners, landlords and building managers. Last reviewed 9 November 2026.

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