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Kitchen extraction cleaning - fan noise
A louder extraction is telling you something - and the kind of noise often points to the cause. A laboured hum usually means grease strain; a rattle, imbalance or a loose part; a grinding, worn bearings; a squeal, a drive belt. Learning to read the noise helps you know what is wrong and what to do. Here is why your extraction has got louder, decoded by sound. This is general guidance.
The short answer
When your extraction gets louder, the noise isn't just an annoyance - it's information. Different kinds of noise point to different causes, so learning to read the sound helps you understand what's likely wrong. Here's how to decode a louder extraction. This is general guidance. Louder usually means a developing problem. First, the general point: a louder extraction usually signals a developing problem - the fan straining, out of balance, wearing, or with a mechanical issue. A fan in good order, running freely and balanced, runs relatively quietly; increased noise means something has changed. So a louder extraction is worth reading and acting on, not tuning out. And the kind of noise helps identify the cause. Decoding the noise. A laboured, heavier hum. Usually means the fan is straining - working harder than it should. The commonest cause is grease: grease loading and unbalancing the fan (so it works harder), and grease choking the wider system (raising the resistance the fan pulls against). So a heavier, more strained hum usually points to a grease-laden, straining system (the most common cause of a gradually louder extraction). A rattle or vibration. Usually means the fan is out of balance - grease built up unevenly on the blades throwing it off balance, so it vibrates and rattles - or a component has come loose (a loose fan, guard, mounting or fitting vibrating). So a rattle points to imbalance (often grease) or a loose part. A grinding or rumbling. Usually means worn bearings - the fan's bearings wearing out, which get noisier (a grinding, rumbling sound) as they wear. This is often accelerated by grease strain over time (a strained fan wears its bearings faster). So a grinding points to bearing wear. A squeal or screech. Usually means a drive belt issue on a belt-driven fan - a worn, slipping or misaligned belt squealing. So a squeal points to the belt. So the noise decodes: hum (grease strain), rattle (imbalance or loose part), grinding (worn bearings), squeal (belt). There can be overlap (more than one cause, or a mix of noises), but the type of sound narrows it down. Grease is the common thread. Note that grease is behind several of these: it loads and unbalances the fan (the hum and rattle), and over time its strain wears the bearings (the grinding). So a grease-laden system is the commonest cause of a louder extraction overall, and grease strain is the first thing to suspect - especially if the noise has crept up gradually as the system got greasier. The mechanical causes (badly worn bearings, a loose part, a belt) may need repair beyond cleaning, but grease is usually involved. What to do: clean and check. Whatever the noise, the response starts the same way: get the extraction cleaned and the fan checked. Cleaned - a proper clean removes the grease that loads, unbalances and strains the fan (resolving the common grease-driven noises - the hum, much of the rattle). Checked - the fan's condition is checked to identify and address any mechanical cause the cleaning doesn't fix (worn bearings needing replacement, a loose part needing securing, a belt needing attention). So decoding the noise tells you what's likely wrong; cleaning and checking puts it right. And don't just tolerate the noise - it usually signals a developing problem heading toward a breakdown if left (a strained, worn fan eventually fails). So act on it. The takeaway. So a louder extraction has a cause you can often read from the noise: a laboured hum (grease strain), a rattle (imbalance or a loose part), a grinding (worn bearings), a squeal (a belt). Grease is the common culprit. Decode the noise to understand it, then get the system cleaned and the fan checked to put it right. So read the noise, then clean and check. This is general guidance.
Key points
Louder means a problem
A louder extraction usually signals a developing problem - the fan straining, out of balance, wearing, or with a mechanical issue. A fan in good order, running freely and balanced, runs relatively quietly; a noticeable increase in noise means something has changed for the worse. So a louder extraction is worth reading and acting on, not tuning out or accepting as the fan just 'getting old'.
And usefully, the kind of noise helps identify the cause. Rather than 'the extraction is noisy' being a vague complaint, the specific sound - a laboured hum, a rattle, a grinding, a squeal - points toward what's actually wrong. So learning to read the noise turns it into useful diagnostic information: you can often tell, from the sound, what the likely problem is (and therefore what to do). So louder means a problem - read the noise, don't ignore it - is the starting point: treat the increased noise as a signal to decode and act on. The following sections decode the common noises and cover what to do. So a louder extraction is a signal worth reading. This is general guidance.
Decode the noise
The type of noise points to the cause. A laboured, heavier hum usually means the fan is straining - working harder than it should - most often from grease loading and unbalancing it (so it works harder) and grease choking the wider system (raising the resistance the fan pulls against). So a heavier, strained hum usually points to a grease-laden, straining system - the most common cause of a gradually louder extraction. A rattle or vibration usually means the fan is out of balance (grease built up unevenly on the blades throwing it off balance, so it vibrates) or a component has come loose (a loose fan, guard, mounting or fitting vibrating).
A grinding or rumbling usually means worn bearings - the fan's bearings wearing out, which get noisier (a grinding, rumbling sound) as they wear, often accelerated by grease strain over time. And a squeal or screech usually means a drive belt issue on a belt-driven fan - a worn, slipping or misaligned belt squealing. So the noise decodes: hum (grease strain), rattle (imbalance or loose part), grinding (worn bearings), squeal (belt). There can be overlap (more than one cause, or a mix of sounds), but the type of noise narrows down the likely cause. So decode the noise - hum, rattle, grinding, squeal - is the diagnostic key: match the sound to the likely cause. So the kind of noise tells you the likely problem. This is general guidance.
Grease is the common thread
Note that grease is behind several of these noises. It loads and unbalances the fan (producing the laboured hum and much of the rattle), and over time its strain wears the bearings (contributing to the grinding). So a grease-laden system is the commonest cause of a louder extraction overall, and grease strain is the first thing to suspect - especially if the noise has crept up gradually as the system got greasier.
This is why, whatever the specific noise, grease should be the first suspect: a grease-laden, straining fan is behind most louder-extraction cases, either directly (the hum, the imbalance rattle) or as the underlying cause of the wear (grease strain wearing the bearings). The purely mechanical causes (a badly worn bearing needing replacement, a loose part, a belt) are real and may need repair beyond cleaning, but grease is usually involved somewhere - and cleaning is the first, often sufficient, step. So grease is the common thread - suspect grease strain first - guides the response: whatever the noise, start by suspecting (and removing) grease. The exact mechanical cause is then checked and addressed as needed. So grease is usually behind the noise; suspect it first. This is general guidance.
What to do
Whatever the noise, the response starts the same way: get the extraction cleaned and the fan checked. Cleaned - a proper extraction clean removes the grease that loads, unbalances and strains the fan (and chokes the wider system), which resolves the common grease-driven noises: the laboured hum (strain relieved), and much of the rattle (imbalance from uneven grease removed). So cleaning addresses the commonest cause and often quietens the fan on its own.
Checked - the fan's condition is then checked to identify and address any mechanical cause the cleaning doesn't fix: worn bearings (a grinding that persists after cleaning - needing repair or replacement), a loose part (a rattle that remains - needing securing), or a belt issue (a squeal - needing attention). So cleaning removes the grease-driven noise, and the check catches any remaining mechanical cause. This clean-then-check approach handles both the common grease cause and the mechanical ones. So what to do - clean it, then check what remains - is the practical response to any louder extraction: clean the grease away (resolving most cases), and check the fan for any mechanical fault the cleaning leaves (identified partly by which noise persists). So clean first, then check for a remaining mechanical cause. This is general guidance.
Don't tolerate the noise
The final point is not to just tolerate a louder extraction, because the noise usually signals a developing problem heading toward a breakdown if left. A straining, unbalanced, or worn fan doesn't stay the same - it deteriorates: the grease strain wears the fan, the imbalance stresses it, the worn bearings worsen, the slipping belt fails. So the noise is an early stage on a path toward a failure (a seized or failed fan that stops the extraction, as covered in the cost-of-an-extract-fan-seized-by-grease page).
So the noise is a valuable early warning - decoding it and acting (clean and check) addresses the problem while it's still recoverable, and catches any developing fault early. Tuning out the noise, by contrast, lets the underlying problem progress toward a breakdown (at bad timing and high cost). So heed the louder extraction: read the noise to understand it, and get the system cleaned and the fan checked to put it right - rather than living with it until it fails. So don't tolerate the noise - it's heading somewhere if ignored - is the takeaway: a louder extraction is a readable, actionable warning, so decode it and act, don't accept it. So act on the noise before it becomes a breakdown. This is general guidance.
Questions
Usually a developing fan problem you can often read from the noise - a laboured hum means grease strain, a rattle means imbalance or a loose part, a grinding means worn bearings, a squeal means a belt; grease is the commonest cause. A louder extraction usually signals a developing problem, and the kind of noise points to the cause. A laboured, heavier hum usually means the fan is straining - most often from grease loading and unbalancing it and choking the system (the commonest cause). A rattle or vibration usually means the fan is out of balance (often from uneven grease on the blades) or a component has come loose. A grinding or rumbling usually means worn bearings (often accelerated by grease strain). A squeal or screech usually means a drive-belt issue. So the noise decodes: hum (grease strain), rattle (imbalance or loose part), grinding (worn bearings), squeal (belt). Grease is the common thread - a grease-laden, straining fan is behind most cases - so suspect grease first. Whatever the noise, get the system cleaned (removing the grease) and the fan checked (for any mechanical cause). So usually grease strain, readable from the noise. So a straining fan, usually from grease. This is general guidance.
It usually means the fan is straining - working harder than it should - most often because grease has loaded and unbalanced it and choked the system, raising the resistance; it's the commonest cause of a gradually louder extraction. A laboured, heavier hum usually means the fan is straining - working harder than it should. The commonest cause is grease: grease building up on the fan loads and unbalances it (so it works harder to turn), and grease building up in the filters and ductwork chokes the airflow (raising the resistance the fan pulls against). So the fan strains on both counts, producing a heavier, more strained hum. This is the most common cause of a gradually louder extraction - the sound of a grease-laden, straining system. So if your extraction has developed a laboured, effortful hum (especially creeping up over time as the system got greasier), suspect grease strain, and get the system cleaned (removing the grease that's straining the fan) - which usually relieves the strain and quietens the hum. If the hum persists after cleaning, the fan may be worn and need checking. So a laboured hum usually means grease strain. So the fan straining, usually from grease. This is general guidance.
A rattle usually means the fan is out of balance (often uneven grease on the blades) or a part has come loose; a grinding usually means worn bearings, often worn faster by grease strain over time. A rattling and a grinding point to different things. A rattle or vibration usually means the fan is out of balance - grease built up unevenly on the blades throwing it off balance, so it vibrates and rattles - or a component has come loose (a loose fan, guard, mounting or fitting vibrating). So a rattle points to imbalance (often grease) or a loose part. A grinding or rumbling usually means worn bearings - the fan's bearings wearing out, which get noisier (a grinding, rumbling sound) as they degrade; this is often accelerated by grease strain over time (a strained fan wears its bearings faster). So a grinding points to bearing wear. Cleaning addresses a grease-imbalance rattle (removing the uneven grease); a loose part needs securing; and worn bearings need checking and likely repair/replacement (cleaning won't fix worn bearings, though it removes the strain that wears them). So a rattle is imbalance or a loose part; a grinding is worn bearings. So rattle = imbalance/loose; grinding = bearings. This is general guidance.
Yes - grease is the common thread: it loads and unbalances the fan (the hum and rattle) and, over time, wears the bearings (the grinding); so a grease-laden, straining fan is the commonest cause, and grease strain is the first thing to suspect. Yes - grease is usually behind a louder extraction. It's the common thread across the noises: grease loads and unbalances the fan (producing the laboured hum and much of the imbalance rattle), and over time its strain wears the bearings (contributing to the grinding). So a grease-laden, straining system is the commonest cause of a louder extraction overall, and grease strain is the first thing to suspect - especially if the noise has crept up gradually as the system got greasier. The purely mechanical causes (a badly worn bearing, a loose part, a belt) are real and may need repair beyond cleaning, but grease is usually involved somewhere. So whatever the specific noise, start by suspecting and removing grease - cleaning the system is the first, often sufficient, step, and it addresses the underlying cause of most louder-extraction cases. Then check the fan for any remaining mechanical fault. So yes - grease is the usual culprit; suspect it first. So yes; grease strain is the common cause. This is general guidance.
Get it cleaned and checked - cleaning removes the grease that loads, unbalances and strains the fan (resolving the common noise), and the check identifies any mechanical cause the cleaning doesn't fix (worn bearings, a loose part, a belt); don't just tolerate it. Whatever the noise, the response starts the same way: get the extraction cleaned and the fan checked. Cleaned - a proper clean removes the grease that loads, unbalances and strains the fan and chokes the system, resolving the common grease-driven noises (the laboured hum, much of the rattle) and often quietening the fan on its own. Checked - the fan's condition is checked to identify and address any mechanical cause the cleaning doesn't fix: worn bearings (a persistent grinding - needing repair/replacement), a loose part (a persistent rattle - needing securing), or a belt issue (a squeal - needing attention). So cleaning removes the grease-driven noise, and the check catches any remaining mechanical fault (identified partly by which noise persists). And don't just tolerate the noise - it usually signals a developing problem heading toward a breakdown if left, so act on it while it's still recoverable. So clean it, check it, and don't ignore it. So clean and check the system, and act promptly. This is general guidance.
Yes - the noise usually signals a straining, unbalanced or worn fan that deteriorates if left, heading toward a failure (a seized or failed fan); heeding the noise and cleaning/checking catches it first. Yes - a louder extraction can lead to a breakdown if the underlying cause is left unaddressed. The noise usually signals a developing problem - a straining, unbalanced, or worn fan - and these don't stay the same; they deteriorate. Grease strain wears the fan, imbalance stresses it, worn bearings worsen, a slipping belt fails - so the fan progresses toward a failure (a seized or failed fan that stops the extraction, at bad timing and high cost). So the noise is an early stage on a path toward a breakdown. This is why the noise is a valuable early warning: decoding it and acting (cleaning to remove the grease strain, and checking the fan for any developing fault) addresses the problem while it's still recoverable and catches wear early. Tuning out the noise lets the problem progress toward failure. So yes - a louder extraction can end in a breakdown if ignored, which is why you should heed and act on it. So yes, if left - so act on the warning. So yes; heed the noise and clean/check. This is general guidance.
A louder extraction usually means a grease-laden, straining fan; we clean the whole system to TR19 Grease - removing the grease that loads, unbalances and strains it - and check its condition, resolving the common noise and catching any mechanical fault early. Ask us to clean and check your noisy extraction. This is general guidance.
