Cost & commercial
Regular cleaning is a known, modest cost. A fan seized by grease is an unknown, ugly one - a replacement unit, an installer, out-of-hours rates and, because you cannot legally run a kitchen without working extraction, a closed cookline while it is sorted.
The short answer
Regular cleaning is a known, modest cost. A fan seized by grease is an unknown, ugly one - a replacement unit, an installer, out-of-hours rates and, because you cannot legally run a kitchen without working extraction, a closed cookline while it is sorted.
The detail
The fan itself is only the start. A commercial extractor fan runs from about £150 for a compact unit to £1,500 or more for a high-capacity inline or axial fan, and a full replacement with labour commonly lands between £500 and £3,000, higher on larger systems with awkward roof access.
Grease is what drives it there. A loaded impeller runs out of balance, so bearings wear, the motor draws more current and runs hot, and it trips or fails under load at the busiest moment. What began as a cleaning task becomes a mechanical failure, and mechanical failures are replaced, not degreased.
Then the kitchen stops. You cannot legally operate a commercial kitchen without working extraction, so a seized fan can close the cookline until it is fixed - and an emergency, out-of-hours replacement carries a premium over a planned one, on top of the revenue lost while the doors are shut.
Against that, regular cleaning is small and predictable. Keeping the impeller and duct clear holds the fan in balance, keeps running current and temperature down, and lets wear be spotted and fixed as a minor job. Maintained systems also run more efficiently - balanced fans can cut running costs noticeably against grease-clogged ones.
What it means for you
Compare the numbers honestly. A full certified clean for a typical kitchen sits around £300 to £600, done on a schedule; a grease-driven fan replacement plus install plus lost trading days runs into the low thousands and arrives without warning. Cleaning is the cheap, planned side of that comparison.
Cleaning also protects the fan you already have. Kitchen fans wear faster than most because of the grease they handle; keeping them clean extends their life towards the top of their range rather than the bottom, deferring the replacement cost by years rather than bringing it forward.
Phoenix Duct Clean cleans and inspects the fan as part of the system, catching a worn bearing or an out-of-balance impeller while it is still a small fix, so you spend on maintenance rather than on an emergency replacement and a shut kitchen.
The service behind the guide
Sibling guides
why frequency lowers your spend · cleaning vs replacement · why takeaways run high grease
Questions
The unit runs from about £150 to £1,500 or more, and a full replacement with labour commonly lands between £500 and £3,000, higher on large or roof-access systems. Emergency, out-of-hours work adds a premium on top.
A grease-loaded impeller runs out of balance, wearing bearings and forcing the motor to draw more current and run hot until it trips or fails under load. Cleaning keeps the fan balanced and cool, preventing that failure path.
It can. You cannot legally run a commercial kitchen without working extraction, so a seized fan may shut the cookline until it is replaced - and the lost trading time often costs more than the fan itself.
Clearly. A scheduled clean is a few hundred pounds and predictable; a grease-driven fan failure is low thousands and unplanned, plus closure. Cleaning is the cheap side of that comparison every time.
Yes. Kitchen fans wear fast because of grease; keeping the impeller and motor clean holds them in balance and defers replacement towards the top of their service life rather than the bottom.
Phoenix Duct Clean · by the numbers
Book a clean and inspection now, before a grease-loaded fan becomes a replacement.