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Kitchen extraction cleaning - floor clues
Floors near the cooking line that stay sticky however much you mop can be more than a cleaning problem - they can be an extraction clue. Airborne grease the extraction isn't capturing settles out onto the floor and surfaces, leaving a film that returns. It often points to a system underperforming or overdue a clean. Here is what sticky floors near the line can tell you about your extraction. This is general guidance.
The short answer
You mop the floor near the cooking line, and within hours it's sticky again - a greasy film that just won't stay gone. It's easy to treat this as purely a floor-cleaning problem. But persistently sticky floors near the line can be a clue about your extraction. Here's what they can be telling you. This is general guidance. What the stickiness can mean. A persistent greasy, sticky film on the floor (and surfaces) near the cooking line can be airborne grease that the extraction isn't capturing, settling out. Cooking releases grease into the air (the grease-laden plume rising off the appliances). In a well-performing extraction, the canopy captures that plume and the system draws it away - so relatively little grease escapes into the kitchen to settle. But if grease is escaping the canopy (because the extraction is underperforming), it drifts and settles out onto the nearest surfaces - the floor around the line especially - leaving a greasy film. Mopping removes it temporarily, but it keeps coming back because it's being continuously replenished from the air. So sticky floors near the line that return however much you mop can be a sign that airborne cooking grease is escaping the extraction and settling. Why the extraction might be missing it. If grease is escaping the canopy to settle on the floor, the extraction isn't capturing it as it should - and the reasons are the usual weak-capture causes: A grease-laden system overdue a clean (the commonest). Grease build-up chokes the airflow, weakening the capture at the canopy, so more grease escapes (as covered in the airflow-dropping-off and reduced-suction pages). This is the most likely cause. An undersized or poorly-positioned canopy. If the canopy is too small or badly placed, it doesn't capture the whole plume, so grease escapes (a design issue). A make-up air problem. Inadequate make-up air starves the extraction, weakening capture. So the sticky floor points back to weak capture at the canopy - most often from a system that's grease-laden and due a clean. What to do. The useful response is not just to mop harder, but to check the extraction. If your floors near the line are persistently sticky (and especially if there are other signs of weak extraction - a smoky or hot kitchen, greasy surfaces, poor capture at the canopy), consider the extraction as a cause: get it inspected, and if it's grease-laden or due a clean (the likely case), get it cleaned to the TR19 Grease standard - restoring the capture so less grease escapes to settle on the floor. If cleaning doesn't resolve it, a capture or make-up air issue may need a ventilation assessment. A clue among others. Sticky floors have other possible causes too - spills, cleaning-product residue, using the wrong floor-cleaning method or products, or a flooring issue - so it's one clue among several, not a certain diagnosis. But a greasy film specifically near the cooking line that keeps returning after mopping is characteristically airborne cooking grease - so it's worth reading as a possible extraction clue and checking the system (rather than assuming it's only a floor-cleaning failing). The takeaway. So persistently sticky floors near the line can be an extraction clue: airborne grease the extraction isn't capturing, settling out - often pointing to a system that's underperforming and overdue a clean. Don't just mop harder; check the extraction, and clean it if it's due. So read sticky floors near the line as a possible sign your extraction needs attention. This is general guidance.
Key points
More than a floor problem
Floors near the cooking line that stay sticky no matter how much you mop can be more than a floor-cleaning problem - they can be an extraction clue. The tell-tale is a persistent greasy, sticky film on the floor (and nearby surfaces) around the line that keeps coming back: you mop it away, and within hours it's returned. That returning quality is the key - it's not a one-off spill you can clean up, but a film that's continuously replenished.
What replenishes it is airborne grease settling out of the kitchen air. Cooking releases grease into the air, and if it's not being captured and drawn away by the extraction, it drifts and settles onto the nearest surfaces - the floor around the line especially. So the sticky film is being fed from the air, which is why mopping only removes it temporarily. This reframes the problem: a persistently sticky floor near the line isn't necessarily a failure of floor cleaning (mopping harder or more often won't fix a film that's continuously resupplied from the air) - it can be a sign that airborne cooking grease is escaping the extraction and settling. So more than a floor problem - a film that keeps coming back - is the clue: the returning greasy film points beyond the floor, to the air and the extraction. The following sections cover why the extraction might be missing the grease and what to do. So a returning greasy film hints at an extraction issue. This is general guidance.
Grease the extraction misses
The mechanism behind the sticky floor is airborne grease the extraction isn't capturing, settling out. Cooking releases a grease-laden plume that rises off the appliances. In a well-performing extraction, the canopy captures that plume and the system draws it away - so relatively little grease escapes into the kitchen to settle anywhere. The grease is caught and removed, and the surfaces stay relatively grease-free.
But if grease is escaping the canopy - because the extraction is underperforming and not capturing the whole plume - then that escaped grease drifts through the kitchen air and settles out onto the nearest surfaces, the floor around the line especially (grease settles downward and nearby). There it leaves the greasy, sticky film. So the sticky floor is, in effect, a deposit of the grease the extraction failed to capture - the airborne grease that escaped, condensed and settled. This links the floor directly to the extraction's capture performance: good capture, little escaped grease, less settling; poor capture, more escaped grease, more settling (the sticky floor). So grease the extraction misses - escaping the canopy and settling - is what the sticky floor represents. The question then is why the extraction is missing it, covered next - and most often it's a grease-laden system due a clean. So the floor film is grease that escaped the extraction. This is general guidance.
Why capture is weak
If grease is escaping the canopy to settle on the floor, the extraction isn't capturing it as it should - and the reasons are the usual weak-capture causes. The commonest by far: a grease-laden system overdue a clean. Grease build-up chokes the airflow (raising the resistance and cutting the flow), which weakens the capture at the canopy - so more grease escapes (as covered in the airflow-dropping-off and reduced-suction pages). A system that's due a clean captures less, so more grease gets into the kitchen air to settle. This is the most likely cause of the sticky floor.
Other possible causes: an undersized or poorly-positioned canopy (too small or badly placed to capture the whole plume, so grease escapes - a design issue); or a make-up air problem (inadequate replacement air starving the extraction, weakening capture). But the first thing to suspect - as with most weak-extraction symptoms - is grease: a system that's grease-laden and overdue a clean. So the sticky floor points back to weak capture at the canopy, most often from a system due a clean. So why capture is weak - usually a system overdue a clean - identifies the likely cause: the extraction is grease-choked and under-capturing, letting grease escape to settle. This is good news in a way, because it's the easily-fixable cause: cleaning the system restores the capture. So suspect a grease-laden, overdue system first. This is general guidance.
Check, don't just mop
The useful response to persistently sticky floors near the line is not just to mop harder, but to check the extraction as a possible cause. Mopping harder or more often won't fix a greasy film that's continuously replenished from the air - so if the film keeps returning, look upstream at where the grease is coming from: the extraction failing to capture it. If your floors near the line are persistently sticky - especially with other signs of weak extraction (a smoky or hot kitchen, greasy surfaces around the line, visibly poor capture at the canopy) - consider the extraction.
The practical step: get the extraction inspected, and if it's grease-laden or due a clean (the likely case), get it cleaned to the TR19 Grease standard - restoring the capture at the canopy so less grease escapes to settle on the floor. In many cases, cleaning the system will noticeably reduce the sticky-floor problem (because the grease is being captured again). If a proper clean doesn't resolve it, then a capture or make-up air issue may be involved, worth a ventilation assessment (the canopy size/position or the make-up air). So check, don't just mop - look at the extraction as a cause - is the key action: treat the sticky floor as a possible symptom of the extraction, and address the source, rather than endlessly fighting the film at floor level. So investigate and clean the extraction, not just the floor. This is general guidance.
One clue among others
It's worth keeping the sticky floor in perspective: it's one clue among others, not a certain diagnosis. Sticky floors have other possible causes too - spills and residues, cleaning-product residue (using too much product, or not rinsing), the wrong floor-cleaning method or products, or a flooring issue - so a sticky floor isn't automatically an extraction problem. You should rule out the obvious floor-cleaning causes too.
But a greasy film specifically near the cooking line that keeps returning after proper mopping is characteristically airborne cooking grease - so that particular pattern is worth reading as a possible extraction clue and checking the system, rather than assuming it's only a floor-cleaning failing. The distinguishing features are the location (near the line, where escaped cooking grease settles), the greasy nature (a grease film, not just general dirt), and the persistence (returning despite proper cleaning - because it's resupplied from the air). If those fit, suspect the extraction (and especially a system due a clean). So one clue among others - read it, and check the system - is the balanced takeaway: don't over-diagnose every sticky floor as extraction, but do read a persistent greasy film near the line as a possible sign your extraction is under-capturing, and check (and likely clean) the system. So treat it as a clue worth following up on the extraction. This is general guidance.
Questions
A persistent greasy film near the line can be airborne cooking grease the extraction isn't capturing, settling onto the floor; it returns after mopping because it's replenished from the air - often pointing to an extraction that's underperforming or overdue a clean. Floors near the line that stay sticky however much you mop can be an extraction clue. Cooking releases grease into the air; in a well-performing extraction, the canopy captures it and the system draws it away, so little escapes to settle. But if the extraction is underperforming (weak capture), more airborne grease escapes the canopy, drifts, and settles onto the floor and surfaces near the line - leaving a greasy film that mopping only temporarily removes (because it's continuously replenished from the air). So a persistent sticky film near the line, especially with other weak-extraction signs (a smoky or hot kitchen, greasy surfaces), can point to an extraction that's underperforming - most often because it's grease-laden and overdue a clean. So check the extraction, not just the floor. (Other causes like spills or cleaning-product residue exist too.) So it can be grease your extraction is missing. So often airborne grease from a weak extraction. This is general guidance.
If the extraction isn't capturing the cooking's airborne grease, that grease escapes the canopy, drifts and settles onto the floor near the line, leaving a greasy film - so the sticky floor is a deposit of grease the extraction failed to capture. The link is airborne grease settling. Cooking releases a grease-laden plume; a well-performing extraction captures it at the canopy and draws it away, so little escapes into the kitchen to settle. But if the extraction is under-capturing (underperforming), grease escapes the canopy, drifts through the kitchen air, and settles out onto the nearest surfaces - the floor around the line especially (grease settles downward and nearby). There it leaves a greasy, sticky film. So the sticky floor is effectively a deposit of the grease the extraction failed to capture. This links the floor directly to the extraction's capture performance: good capture means little escaped grease and less settling; poor capture means more escaped grease and a stickier floor. So the floor film is grease that escaped the extraction and settled. So it's escaped airborne grease settling on the floor. This is general guidance.
Often yes - the commonest cause of weak capture (letting grease escape to settle) is a grease-laden system overdue a clean; so a persistent greasy film near the line is worth treating as a prompt to get the extraction inspected and likely cleaned. A persistently sticky, greasy floor near the line often does point to an extraction needing cleaning. If grease is escaping the canopy to settle on the floor, the extraction is under-capturing - and the commonest cause of weak capture is a grease-laden system overdue a clean (grease build-up chokes the airflow, weakening capture, so more grease escapes). So a persistent greasy film near the line, especially with other weak-extraction signs, is worth treating as a prompt: get the extraction inspected, and if it's grease-laden or due a clean (the likely case), get it cleaned to the TR19 Grease standard - restoring the capture so less grease escapes to settle. Cleaning often noticeably reduces the sticky-floor problem. If a proper clean doesn't resolve it, a capture or make-up air issue may be involved (a ventilation assessment). So often yes - it's worth checking and likely cleaning the extraction. So frequently yes; check and clean it. This is general guidance.
Spills and residues, cleaning-product residue (too much product or poor rinsing), the wrong floor-cleaning method or products, or a flooring issue - so rule those out too; but a greasy film specifically near the line that returns is characteristically airborne cooking grease. Sticky floors have several possible causes beyond extraction, so it's one clue among others. Other causes include: spills and food residues not fully cleaned; cleaning-product residue (using too much product, or not rinsing properly, leaving a sticky film); the wrong floor-cleaning method or products (unsuitable for the floor or the grease); or a flooring issue. So you should rule out the obvious floor-cleaning causes too - a sticky floor isn't automatically an extraction problem. However, a greasy film specifically near the cooking line that keeps returning after proper mopping is characteristically airborne cooking grease (distinguished by its location near the line, its greasy nature, and its persistence despite proper cleaning). So that particular pattern is worth reading as a possible extraction clue. Rule out the floor-cleaning causes, but if a greasy film near the line persists, check the extraction. So spills, product residue or cleaning method - but a returning greasy film near the line suggests grease. So other causes exist; check them and the extraction. This is general guidance.
If the stickiness is from grease the extraction was missing, then cleaning the system (restoring the capture) will noticeably reduce it - less grease escapes to settle; if it persists after a proper clean, a capture or make-up air issue may need a ventilation assessment. If the sticky floor is caused by airborne grease the extraction was failing to capture, then cleaning the extraction should noticeably reduce it. A proper clean (the whole system, to the TR19 Grease standard) removes the grease build-up that was choking the airflow and weakening the capture - so the canopy captures the plume properly again, less grease escapes into the kitchen air, and less settles on the floor. So in the common case (a grease-laden system under-capturing), cleaning restores the capture and reduces the sticky-floor problem. If, however, the floor stays sticky after a proper clean, the cause may not be a dirty system but a capture or make-up air issue (an undersized or poorly-positioned canopy, or inadequate make-up air) - which needs a ventilation assessment rather than more cleaning. And rule out non-extraction causes (spills, product residue) too. So cleaning fixes it if grease escape was the cause; otherwise investigate further. So usually yes, if grease was the cause. This is general guidance.
Check the extraction - a greasy film continuously replenished from the air won't be fixed by mopping harder; look at where the grease is coming from (the extraction under-capturing), and clean the system if it's due. If your floor near the line is persistently sticky with a greasy film, checking the extraction is more useful than just cleaning the floor harder. The reason: a greasy film that's continuously replenished from the air won't be fixed by mopping - however hard or often you mop, it returns because grease keeps settling from the air. So the effective response is to address the source: the extraction under-capturing and letting grease escape. Get the extraction inspected, and if it's grease-laden or due a clean (the likely cause), get it cleaned - restoring the capture so less grease escapes to settle, which reduces the sticky floor at its root. Of course, keep cleaning the floor too (and rule out floor-cleaning causes like product residue) - but don't rely on floor cleaning alone to fix what's really an extraction issue. So check the extraction and address the source, alongside floor cleaning. So check the extraction - mopping alone won't fix it. This is general guidance.
A persistent greasy film near the line can be grease your extraction isn't capturing; we inspect and clean the whole system to TR19 Grease, restoring the capture at the canopy - so less grease escapes to settle on your floor and surfaces. Ask us to check and clean your extraction. This is general guidance.
