Hertfordshire · Extract fan repair and replacement
Extractor fan repair in Knebworth
Extract fan repair for Knebworth, with a survey first and a report with pictures at the end. Ask us for a fixed quote.
- A fan worn beyond sensible repair
- A motor that trips out or overheats
- A humming noise from the fan motor
Your questions about extract fan repair in Knebworth
Is Knebworth within the area you cover?
Yes, Knebworth is part of our area, however small the site. A survey first, from photos or a visit, means we arrive with the right kit.
What if my kitchen extract fan stops in Knebworth at night?
Extract fan emergencies in Knebworth are covered around the clock. Ring 0345 646 2711 at any hour and describe the fault. If you can, stop cooking until the fan is checked.
Are you insured?
Yes. We’re fully insured, and the details are available on request.
Where does the waste go?
It’s contained and taken away. Grease, debris and waste water are collected as the work goes on rather than letting it spread.
How much notice do you need?
For planned work, earlier is better, especially if the next clean or test is due soon. Emergencies are different, because our line is open 24/7.
Can you repair a fan rather than replace it?
Often, yes. A clean, a new belt or new bearings can bring a fan back, and we’ll always say when repair makes sense.
Can you set up regular visits?
Yes. Plans on a 3, 6 or 12-monthly cycle are available, to suit the system and how it’s used.
Which kinds of sites do you work on?
Any commercial site with kitchens or ventilation, from a single café to a large school. Hotels, schools, care homes, offices, shops and leisure sites are all part of our work.
Extract fan repair in Knebworth
We treat a failing fan much like a patient: we hear the symptoms, find the cause and put it right. The aim is steady, quiet extraction and a clear explanation of what was done. Typical jobs include poor airflow at the canopy and a dead fan motor, on belts and pulleys, fan motors and kitchen extract fans.
Around a place like Knebworth, a pub, café or care home kitchen with a failed fan cannot carry on cooking as normal. Our 24/7 emergency line is there for exactly that.
It’s worth checking any contractor’s accreditations. Ours are BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease, plus CHAS, SafeContractor and ISO 9001, and we are fully insured.
- Place
- Knebworth (SG3)
- Region
- Hertfordshire
- Reporting
- Photo report after each visit
- Price
- A fixed price before any work starts
- When we work
- Overnight and weekend work, 24/7 emergency callout
- Call
- 0345 646 2711
- Page updated
- 30 October 2026
How the job changes from site to site
Impellers and housings
The fan housing collects grease too. Both are inspected and cleaning may be part of the fix.
Direct-drive fans
In a direct-drive fan, the impeller sits on the motor shaft. There are no belts, so faults tend to be in the motor, bearings or impeller.
Towns and villages near Knebworth
Other services in Knebworth
Keeping the system healthy
How long the results last depends on use and care. Here’s what we suggest:
- Tell us about a new rattle or whine straight away
- Avoid lowering the speed to quieten a fault
- Book regular TR19 cleaning, which includes the fan
- Save our number for the 24/7 emergency line
Listen to the fan over the next few weeks. A new noise or vibration is worth reporting early rather than waiting for it to fail.
The fan is part of every full TR19 clean. A clean impeller stays in balance and that means less wear.
When a fan fails in Knebworth
Food Standards Agency records list about 13 cafés, restaurants and staff canteens and about 9 takeaways within about 1.5 miles of central Knebworth. A kitchen with a dead extract fan gets hot and smoky fast, and kitchens like these feel it at once. In Knebworth, food businesses are inspected by environmental health officers from North Hertfordshire council. Food hygiene rules expect food premises to have suitable and sufficient ventilation. So a failed fan is worth fixing before the next service, not the next month. Knebworth is about 26 miles from central London, well within the area we cover across London and the South East. We work evenings, overnight and at weekends, so the visit fits around the site.
If you manage a school such as Knebworth Primary and Nursery School and the kitchen fan is getting louder, the next break is the time to deal with it. If you look after a church or hall kitchen near Church of St Martin, or anywhere in Knebworth, test the extract fan before a big event rather than on the day.
Knebworth is about 3 miles south of Stevenage, in Hertfordshire. From the centre of Knebworth to the outskirts, extract fan repair is available to all kinds of commercial premises, from small sites to large estates. Across Hertfordshire, we cover 381 places, and Knebworth is one of them. You can also see our page for London, roughly 26 miles from Knebworth.
Extract fan repair in SG3 follows the same survey, fixed quote and written report as everywhere else we cover. Whether your site is on London Road, Deanscroft and Lytton Fields or anywhere close by, our technicians can take on the work. We also cover 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).
Local landmarks in Knebworth
Locally, jobs take us to businesses close to Barnwell School and Knebworth Park and the streets around them. Knebworth has its own railway station: Knebworth station. Other landmarks nearby include Benington Castle (3.6 miles north-east) and Datchworth Museum (1.7 miles south-east). Green spaces nearby include Mardley Heath.
What we’re called out for in Knebworth
Some faults are in the controls rather than the fan. A failed speed controller or a wiring fault can stop a fan so we check the controls before blaming the motor.
What we are most often called out for:
- A knocking noise from the extract fan
- Vibration spreading from the fan into the ducts
- An old fan that needs replacing
- A fan that will not start at all
For kitchens close to Knebworth station, a fan that stops mid-service needs fixing fast, and our emergency line runs 24/7.
What to look for in a quote
- Whether a survey comes first
- What insurance they carry
- Whether the quote shows VAT
- How areas they cannot reach will be recorded
Managing agents and facilities teams in Knebworth
Running several sites is easier with one contractor. We work across London and the South East, so a run of sites can go into one programme and kept to a regular schedule.
We work for landlords, managing agents and facilities managers as well as the people running the site. Where a system serves more than one tenant, such as a shared riser, it helps to agree who arranges the work, and we are happy to quote for all of it.
How we price extract fan repair
Every site gets its own quote. These are the things that affect it:
- Any permits to work or inductions
- A single visit or a regular plan
- The condition we find in the survey
- The scale of the work
No two sites are the same, so we price each one individually. Size, access, the condition of the system and when we can work all make a difference.
What to send for a quote
Photos let us diagnose from a distance. The most useful are:
- How we’d reach plant on a roof or in a plant room
- Photos showing the whole system and its surroundings
- Problems your staff have spotted
- The times we could work without disrupting the site
There’s no standard price list, because every site is different. Instead, we look at your site first, from pictures or a survey, and then give you a fixed quote. To get going, phone us on 0345 646 2711 or email us.
The process
The visit has three parts: getting the area ready, doing the work and signing it off. Set-up means sheeting and making equipment safe, and the sign-off is a written report with photos. Most of the time goes on the work itself, which takes a few hours on site, depending on the fault and the access to the fan. For a place like Knebworth, we load the van from the survey notes so the work can be done in one visit where possible.
- We agree a time to attend, out of hours if needed.
- We isolate the extract and open the fan housing.
- We inspect every moving part and the fixings.
- We explain the options and quote a fixed price.
- The fan is repaired or replaced, then checked running.
Getting ready for the visit
- Make sure equipment near the work can be switched off and left to cool
- Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas
- Move anything stored near the system
How to get a quote
To help us quote: where the site is, what it is and its opening hours, pictures of the system and any previous report or certificate. Then call us on 0345 646 2711 or drop us a line.
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Why act early in Knebworth
Some kitchens run a noisy fan on a lower speed to cut the noise. It hides the symptom and weakens the extract while the underlying wear continues. Diagnosing the fault properly is the lasting answer. A quieter site near Knebworth still needs its system looked after.
The cost depends on how big the system is, the condition it’s in and access to every part of it. We give you a fixed price before we start, so there are no surprises.
Why choose Duct Doctor in Knebworth
- CHAS, SafeContractor and ISO 9001
- Fixed quotes, usually within one working day
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Every job surveyed first
Read how cleaning jobs are priced or how to check a contractor.