Extractor fan cleaning: the component that quietly fails

Because it is critical (it drives the whole system) but out of sight, so it loads with grease and strains unseen - deteriorating quietly until it fails, often with little warning. The extract fan (on the roof or at the duct end) spins to pull the air through the whole extraction, so the whole system depends on it. But being out of sight, the grease building up on it, and the strain it causes, go unnoticed - unlike the visibly greasy canopy and filters in the kitchen. So the fan quietly loads with grease, becomes unbalanced and strained, and wears - all unseen - until eventually it fails (seizes or burns out) and the whole extraction stops. Because the decline was out of sight, the failure can seem sudden - hence the fan is the component that quietly fails. Cleaning it (as part of the system clean) is what prevents this. So it is called that because it is a critical component that deteriorates unseen until it fails. This is general commentary.

The whole extraction stops - no fan, no airflow, no extraction - so the kitchen loses its ventilation, often has to stop cooking, and the fan needs a costly repair or replacement. The extract fan drives the whole system (it pulls the air through), so if it fails, the extraction stops completely: the kitchen has no ventilation to clear the heat, smoke, steam and grease-laden air. This makes the kitchen unpleasant and unsafe to work in, and it usually cannot operate safely without extraction - so cooking may have to stop until the fan is fixed (lost trade). And the fan itself must be repaired or replaced - a significant cost and a delay to source and fit the part. So a fan failure is a serious, costly breakdown: lost operation and a repair bill, often at short notice. This is exactly what cleaning the fan (sparing it the grease strain) is meant to prevent. So if the fan fails, the extraction stops and the kitchen faces a costly breakdown and lost trade. This is general commentary.

Grease builds up on the fan, unbalancing and loading it, so it strains and wears - and eventually seizes (grease jamming it) or burns out (the overworked motor). As the grease-laden air is pulled through, grease deposits on the fan's impeller/blades and housing. This grease unbalances the fan (depositing unevenly) and loads it (weight and resistance), so the fan works harder, vibrates and labours - it runs under strain. That strain wears the fan over time (stressing the motor, which runs hotter, and the bearings, worn by the vibration). Eventually the fan fails: the grease (which can harden) can seize it (jamming it so it stops), or the overworked, overheated motor can burn out. So grease makes the fan fail by unbalancing and straining it until it seizes or burns out. Cleaning the grease off (keeping the fan balanced and free) prevents this. So grease makes the fan fail by straining it until it seizes or burns out. This is general commentary.

Yes - a proper whole-system extraction clean reaches and cleans the fan along with the filters, canopy and ductwork; the fan should never be left out because it is out of sight. Extraction cleaning to the TR19 Grease standard is a whole-system clean - and the extract fan is part of the system (the component driving it), so it is cleaned along with everything else: the grease removed from the impeller/blades and housing, so the fan runs free and balanced again. Reaching the fan (wherever it is mounted - on the roof or at the duct end) is part of the job. Leaving the fan out (cleaning the visible parts but not the out-of-sight fan) would leave the critical component to keep loading up and straining toward failure - so a proper clean includes it. So yes - the fan is (and should be) cleaned as part of the whole-system extraction clean. If in doubt, confirm the fan is included in your cleaning. So yes - the fan is cleaned as part of a proper whole-system clean. This is general commentary.

At the same interval as the whole system - the fan is cleaned each time the extraction is professionally cleaned, at the frequency matched to your cooking. The fan should be cleaned as part of the whole-system extraction clean, so it is cleaned at the same interval as the rest of the system - which is set by how much and what kind of cooking you do (heavy, greasy or solid-fuel cooking loading the whole system, including the fan, faster and needing more frequent cleaning; lighter cooking less often), per the risk-based approach (TR19 Grease). So there is not usually a separate fan-cleaning schedule - the fan is kept clean by the regular whole-system cleans at the appropriate interval. The key is that the fan is actually included each time (not skipped because it is out of sight), so it never loads up to the failure point between cleans. So the fan is cleaned at the whole-system interval matched to your cooking - as part of each clean. So the fan is cleaned each time the whole system is cleaned. This is general commentary; we can advise the interval.

Sometimes - signs like increased noise or weaker airflow can warn of a straining fan, and a clean can spare it; but because the fan is out of sight, the best protection is regular cleaning, not waiting for symptoms. A fan straining under grease can give warning signs: the extraction getting noisier (the strained fan louder) and weaker (the grease choking the airflow) - the noisier-but-weaker combination that signals a grease-laden, straining system. If these are noticed, having the system cleaned promptly can spare the fan before it fails. But the catch is that the fan is out of sight, so its straining is easily unnoticed (the noise unheard on the roof, the gradual decline unremarked) - so relying on catching symptoms is unreliable. The dependable protection is regular whole-system cleaning (including the fan) at the right interval - keeping the grease from ever building up to the straining, failing point. So a failing fan can sometimes be caught by symptoms, but regular cleaning is the reliable way to prevent the failure. So catch it if you can, but prevent it by regular cleaning. This is general commentary.