Hertfordshire · Extract fan cleaning
Extract Fan Cleaning in Knebworth
One call covers extract fan cleaning in Knebworth: survey, fixed quote, work and sign-off. CHAS and SafeContractor accredited, ISO 9001 and fully insured.
- A fan coated in grease inside its housing
- A fan that no longer moves enough air
- A noisy fan that has got louder over time
What affects the quote in Knebworth
Every site gets its own quote. These are the things that affect it:
- Site requirements such as sign-in and permits
- Travel, parking and unloading
- How easy every part is to reach
- How big the system is
When the work has to happen, how we reach it and how big the site is can all change the price. Each of those is built into the quote and give you a fixed price before any work starts.
Helping us quote
A few details help us quote accurately. With your enquiry, please include:
- Any previous report or certificate
- Problems your staff have spotted
- A few general shots of the system
- The postcode and the type of business
To get a fixed quote, ring 0345 646 2711 or drop us a line and tell us the type of site, your opening hours and roughly what the system looks like. A few pictures and your last certificate or report help a lot. We usually come back within one working day.
Extract fan cleaning in Knebworth
Kitchen extract fans come in different forms: roof-mounted units, inline fans within the duct, and wall fans. The way in depends on the type, and we plan that during the survey. The work covers discharge points, in-line fans and roof-mounted fans, and the jobs we see most are grease stains around the discharge and rough running from the extract fan.
In a smaller place like Knebworth, many kitchens sit in older buildings or later extensions, where the duct may cross a roof void or climb an outside wall. Flat runs collect grease and need proper access to clean.
Each visit ends with a written report and photos, so you have a record of what was done and when. Kitchen extract cleaning to TR19® Grease is certificated through the BESCA Vent Hygiene Elite portal.
- Place
- Knebworth (SG3)
- Region
- Hertfordshire
- Reporting
- TR19® certificate and photo report
- Quote
- A fixed quote up front
- Hours
- When your site is closed, plus a 24/7 line
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
Managing agents and facilities teams in Knebworth
Managing agents often deal with us directly. Tell us the site, the work and the access arrangements and we’ll come back with a fixed quote.
From a single site to a large estate, the standard is the same: a survey first, a fixed quote, the work timed around the site and a report with photos.
Between visits
To keep the system working properly between visits:
- Check the report shows the fan was cleaned
- Watch for grease marks around the outlet
- Check filters are seated before cooking
- Report rattles or humming early
File the photo report with your other extract records. It gives a dated record of the fan’s condition, which helps if anything changes later.
Don’t run the kitchen with the extract off. Air that keeps moving carries vapour out rather than letting it settle, so keeping it running helps keep it clean.
Part by part
Inline duct fans
Some fans are built into the duct itself. We get to them through the duct or casing after isolating them.
Kitchens with long cooking hours
When a busy kitchen’s fan fails, cooking stops. Keeping the fan clean is part of avoiding that, and our 24/7 emergency callout is there if it happens anyway.
How it works
We are used to working while the site is closed. Evenings, nights and weekends are when much of our work happens, so the site can open as normal afterwards. On site, the work takes a couple of hours per fan, depending on its size and the build-up. Tell us when your site near Knebworth is quiet and the visit will be booked for then.
- The fan is found and its type, access and isolation checked.
- We isolate the power before opening the housing.
- Grease is scraped off the impeller blades and casing.
- Blades, housing and surrounds are degreased with care around the electrics.
- We reassemble, run and photograph the fan.
Before we arrive
- Mention any locked doors, roof access or ceiling voids
- Clear the space around the work
- Mention any sign-in, permit or induction we need
How to get a quote
Photos are enough for some jobs, while others need a look on site. Big or complicated sites, and systems that are hard to see in photos, get a survey first. Either way, you get a fixed price before any work starts.
Related advice
Signs you need extract fan cleaning in Knebworth
Grease builds up unevenly on the blades. Over time, that imbalance shakes the fan and puts strain on the bearings. What starts as a grease problem can become a mechanical one.
If you notice any of these, it’s worth a diagnosis:
- A fan shaking on its mounts
- A smell of hot grease from the extract
- A fan that no longer moves enough air
- A heavily greased fan housing
Where a hall near Church of St Martin, or anywhere in Knebworth, hosts lunch clubs or events, its extract gathers grease just as a café’s does.
Before booking anyone
- Whether a written report and pictures are included
- What happens if part of the system cannot be accessed
- Whether the figure could change on the day
- Whether the quote shows VAT
Kitchen extracts in Knebworth
The FSA’s food hygiene register includes about 14 pubs and bars across Knebworth and its immediate surroundings (about a mile and a half). Any of them serving cooked food has an extract to keep clean, from canopy to discharge. Hertfordshire Fire and Rescue Service covers Knebworth. Grease in a kitchen extract is a recognised fire risk, and the fire authority enforces the law on managing it in most commercial premises. Food hygiene inspections in Knebworth are the job of North Hertfordshire council’s environmental health team. A greasy canopy or dripping filters are the sort of thing an inspection can pick up. A dated certificate in the maintenance file answers the question before it’s asked.
Term dates shape school work: for a school like Knebworth Primary and Nursery School, an extract clean fits neatly into a half-term or summer break. If you run catering at a healthcare site, such as a hospital like Lister Hospital about 4.2 miles north, the extract may need cleaning more often than a part-time kitchen.
Knebworth is about 3 miles south of Stevenage, in Hertfordshire. We provide extract fan cleaning for commercial premises of every kind in Knebworth and the rest of Hertfordshire. Across Hertfordshire, we cover 381 places, and Knebworth is one of them. We also work in London, about 26 miles from Knebworth.
Every address in SG3 is within our area for extract fan cleaning, from the main roads to the quietest streets. You’ll find streets such as London Road, Deanscroft and Lytton Fields, all of which we cover for extract fan cleaning. Other places close to Knebworth include Woolmer Green (1 mile south), Bragbury End (1 mile north-east), Oaklands (2 miles south), Datchworth (2 miles south-east) and Shephall (2 miles north). We also work in nearby towns such as Hemel Hempstead (14 miles south-west), Stevenage (3 miles north), St Albans (10 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (5 miles south) and Harpenden (8 miles south-west).
Near you in Knebworth
Typical jobs here are in premises near Barnwell School and Knebworth Park. There’s a railway station in Knebworth itself: Knebworth station. A little further out are Benington Castle (3.6 miles north-east) and Datchworth Museum (1.7 miles south-east). The countryside around Knebworth includes Mardley Heath.
Towns and villages near Knebworth
Also in Knebworth
What happens if it’s left?
A fan that sounds rough in Knebworth is often telling you the extract needs a clean. If the fan is coated, the duct before it usually is too so a full TR19 clean may be due. A visit arranged in advance is far less disruptive than a callout on a busy day.
You will not find a price list here, because each job is priced on what it involves. Call for a fixed quote, and we will explain what it covers.
Why choose Duct Doctor in Knebworth
- One number for every site across the South East and London
- In business since 2009
- Survey first, then a fixed quote
- CHAS, SafeContractor and ISO 9001
Take a look at what affects the cost or how to check a contractor.
Your questions about extract fan cleaning in Knebworth
Who enforces fire safety at workplaces in Knebworth?
It’s Hertfordshire Fire and Rescue Service, which covers Knebworth. A recent cleaning certificate and a note of the next clean date show that grease in the extract is being managed.
Do you clean school canteen extracts around Knebworth out of term?
Yes, and it’s the easiest time to do it. With about 6 schools and colleges on the FSA’s register within roughly a mile and a half of Knebworth, it pays to plan holiday dates ahead. You can give us a ring on 0345 646 2711 or email us with the dates the site is empty.
How long will it take to clean the fan?
One easily reached fan is quick, but hard-to-reach fans take more time. It’s done while the kitchen is closed.
Do you work in Knebworth?
Yes. We work in Knebworth and across Hertfordshire, as part of our work across South East England and London. For a fixed quote, call 0345 646 2711 or send us an email.
Can you clean the fan on its own?
Yes, we can clean just the fan. That helps when the fan needs attention before the next full clean, but it doesn’t replace a full TR19 clean.
Are you insured?
Yes, fully. We also hold CHAS and SafeContractor, for sites that check contractor safety.
Do you need to turn the fan off to clean it?
The fan must be isolated, for safety. We clean out of hours, in the evening, overnight or at weekends, so cooking isn’t affected.
Why is my extract fan noisy?
Uneven grease on the impeller often causes it. After cleaning, we will tell you if wear or damage is also involved.