Kent · Grease filter exchange
Grease filter exchange in Longfield, Kent
Our technicians work in Longfield on grease filter exchange. Out-of-hours visits, a fixed quote and a written report with photos on every job.
- Poor airflow through the filters
- Staff short of time to wash filters
- Damaged filters letting grease past
Common questions in Longfield
Do you clean school canteen extracts around Longfield out of term?
Yes, out-of-term visits are normal for schools. Around Longfield, the Food Standards Agency lists about 11 schools and colleges with registered kitchens within a mile and a half or so. Just phone us on 0345 646 2711, or send details by email with your term dates and we’ll plan around them.
Can you work in Longfield outside opening hours?
Yes, nights and weekends are routine for us. The site is handed back ready to open. Your opening times are the first thing we ask for.
What about areas you cannot get to?
Anything we can’t reach goes on the report, with photos where possible, and we explain what access is needed, for example new access panels.
How far ahead should we book?
Earlier is better, especially for out-of-hours work. We usually quote within one working day, and there’s a 24/7 line for emergencies.
What if some of our filters are damaged?
Each filter is looked at when we exchange. Any that are bent or damaged are flagged, because gaps let grease into the plenum.
How often should grease filters be changed?
There’s no single answer. The schedule is based on how heavily you cook and can change if your kitchen gets busier.
Is Longfield in your area?
Yes. Longfield is part of the area we cover, within the South East and London area we cover.
Will we have to shut during the visit?
Not usually. We work when the area is out of use, such as evenings, overnight, early mornings or weekends, so you keep your normal hours.
Grease filter exchange for kitchens and businesses in Longfield
In Longfield, our filter exchange runs on a schedule set by how much the kitchen cooks. The heavier the cooking, the more often filters need changing, lighter ones less. We agree the interval with you at the start. Typical jobs include a canopy running with filters missing and filter washing that keeps being missed, across mesh filters, school and hospital kitchens and restaurants and pubs.
Somewhere as small as Longfield, commercial kitchens are few: perhaps a pub, a school or care home kitchen, or a hall used for events. Every one of them still needs its extract kept clear of grease.
It’s worth checking any contractor’s accreditations. We are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we hold CHAS, SafeContractor and ISO 9001, with full insurance on top.
- Where
- Longfield (DA3)
- Wider area
- Kent
- Paperwork
- Photo report after each visit
- Quote
- A fixed quote up front
- When we work
- When your site is closed, plus a 24/7 line
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
Places near Longfield
What else we do in Longfield
The process
Everything the job needs comes with us, including protection sheets, the right tools and access kit. You only need to give us clear access and switch off what needs to be off. On site, the work takes a few minutes per canopy, longer for a large kitchen with several canopies. Somewhere like Longfield, lanes, gates and parking are worth mentioning in advance.
- We count and measure the filters in every canopy.
- Together we set how often the filters should be changed.
- At every visit, the greasy filters are lifted out.
- Clean filters go straight back in, seated properly with no gaps.
- We flag any damaged filters or anything wrong with the canopy.
Getting ready for the visit
- Agree a time when the area can be out of use
- Make sure equipment near the work can be switched off and left to cool
- Tell us where we can park and unload
Getting a quote
Some systems can be priced from photos; others need a survey. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, the quote is fixed before any work is booked.
Read more
How we price grease filter exchange
You will get a fixed price before any work starts. It takes into account:
- Whether several sites go on one quote
- Any permits to work or inductions
- Working hours and out-of-hours timing
- The size of the system
The price reflects the work, not guesswork. That’s why every job is surveyed first, and the price is agreed before work begins.
Helping us quote
What to send for a quote:
- When the site is open and when it’s quiet
- Your last certificate, test record or report
- The site address and the type of premises
- Wide photos of the system and the area around it
Photos are the quickest way to a quote: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Tell us what kind of site it is and when it’s open, and we can price many jobs without a visit.
Grease, kitchens and Longfield
Food Standards Agency records list about 6 restaurants, cafés and canteens and about 6 sandwich bars and takeaways within 1.5 miles or so of the middle of Longfield. Any of those kitchens with a canopy relies on its filters to catch grease before it reaches the duct. Food hygiene inspections in Longfield are the job of Dartford council’s environmental health team. They look at how clean the premises and equipment are, and the kitchen extract is part of that. Our report lists what was cleaned and when, which is useful to have ready. Kent Fire and Rescue Service covers Longfield. Its fire safety officers can audit commercial kitchens, and grease in the extract is part of a kitchen’s fire risk.
If you look after a school kitchen, at a school such as Longfield Academy or anywhere near Longfield, the holidays are the usual time for a TR19® clean. A hospital like Darent Valley Hospital, about 3.3 miles north-west, is the kind of site where a kitchen may cook for patients, staff and visitors all day.
Longfield is about 3 miles south-west of Northfleet, in Kent. Sites in Longfield get the same service as everywhere we cover: diagnosis first, a fixed price, out-of-hours working where needed and a written report with photos. Longfield is one of 922 towns, villages and districts in Kent we cover for grease filter exchange. There’s also a page for Maidstone, about 13 miles away.
Every address in DA3 is covered for grease filter exchange, from the main roads to the quietest streets. Whether your site is on Station Road, Main Road and Ightham Close or a nearby road, our technicians can take on the work. Close by, we work in Hartley (1 mile south), New Barn (1 mile east), Longfield Hill (1 mile south-east), New Ash Green (2 miles south) and Nash Street (2 miles east). Further out, we also cover Maidstone (13 miles south-east), Dartford (5 miles north-west), Sevenoaks (10 miles south-west), Gravesend (4 miles north-east), Tonbridge (14 miles south) and Northfleet (3 miles north-east).
Landmarks near Longfield
Typical jobs here are in premises near Railway Tavern, Hartley Primary Academy and Rectory Meadow. Longfield has its own railway station: Longfield station. Well-known places in the area include Darent Valley Hospital (3.3 miles north-west) and Stone Castle (3.4 miles north). The countryside around Longfield includes Sawyers Lake.
Why deal with it now?
Some kitchens in Longfield wash filters themselves to save the cost of a service, and it works when it’s done well and never skipped. When it does not happen reliably, an exchange makes it automatic. A fault that closes a site in a village like Longfield affects everyone who depends on it.
Combining work into one visit or one programme often makes better use of the time. Tell us about everything you’d like looked at, and you will get one fixed quote.
Why choose Duct Doctor in Longfield
- CHAS and SafeContractor accredited, with ISO 9001
- We diagnose before we treat
- Evenings, overnight and weekends, plus 24/7 emergency callout
- One number for every site across the South East and London
Take a look at what affects the cost or how to check a contractor.
When something else is needed
Some problems need a different service or another trade:
- A canopy that needs a proper clean
- Smell complaints that need odour control equipment
- A noisy or failed extract fan
If in doubt, phone us on 0345 646 2711, or email photos and we will say what we think.
What we work on in Longfield
- Mesh filters
- Island canopies
- Baffle filters
- School and hospital kitchens
- Restaurants and pubs
- Wall canopies
Part by part
Baffle filters
Baffle filters are robust and widely used in commercial canopies. They still need regular cleaning as the collected grease builds up between the blades.
Canopy filter housings
Grease collects in the channels and drip trays below the filters. If it needs attention, we’ll tell you.
When to call us in Longfield
Every fry, grill and sauté sends grease-laden vapour upwards. The filters catch much of it, and day by day they load up and airflow falls away.
Most sites get in touch when they notice something like this:
- Damaged filters letting grease past
- Smoke and heat lingering under the hood
- Filters so greasy the air can barely pass
- Drips falling from the filters onto equipment
Commuter trade near Longfield station can mean long cooking hours, and long hours put a kitchen into BESA’s more frequent cleaning bands.
Questions to ask before booking
- How areas they cannot reach will be recorded
- Whether the work can be done while the site is closed
- Whether the quote is based on a survey or pictures
- Whether the figure could change on the day
For landlords and multi-site operators
If you look after several sites, we can schedule visits across all of them on one quote. Every building has its own written report, so each one has its own record.
Whether it’s one building or many, you get the same standard: a survey first, a fixed quote, the work timed around the site and a report with photos.