Kent · Air handling unit cleaning
Crayford AHU cleaning
Our technicians work in Crayford on AHU cleaning. Out-of-hours visits, a fixed quote and a written report with photos as standard.
- Odours coming through the supply air
- Dust-coated heating and cooling coils
- Blocked condensate drains and slimy trays
What the work involves, part by part
Rooftop and plant room units
Units on roofs and in plant rooms can be awkward to reach. We plan safe access as part of the survey so the quote reflects it.
Fans and fan sections
Before the fan is touched, the unit is shut down and made safe in agreement with the site.
AHU cleaning for kitchens and businesses in Crayford
If the units serving a building in Crayford have only had filter changes for years, there may be dirt on the coils, fan and casing that nobody has looked at. A full AHU clean takes in the whole unit. Common call-outs are for filters that are clogged or overdue and air handling units due a clean after building work, across dampers and louvres, heating and cooling coils and supply and extract fans.
Smaller buildings around Crayford often keep their ventilation units in a roof void or plant cupboard, out of sight and easy to overlook. Filters, coils and drain trays need attention whatever the size of the unit.
A written report with pictures follows each visit, so there’s a dated record of the work. Where the work is a TR19® Grease clean, the certificate is issued through the BESCA Vent Hygiene Elite portal.
- Place
- Crayford (DA1, DA5, DA7)
- Wider area
- Kent
- Reporting
- Photo report after each visit
- Quote
- Fixed quote, normally within a working day
- Working hours
- Overnight and weekend work, 24/7 emergency callout
- Call
- 0345 646 2711
- Updated
- 30 October 2026
How the visit works
Your trading hours come first. We book the visit for a time the area is closed, whether that’s an evening, overnight or a weekend. Once we are in, the area is sheeted and anything that has to be off is turned off and cooled, and the job takes a single shift for a typical unit, longer for large or heavily soiled ones. Tell us about any gates, ladders or locked plant areas at your site near Crayford when you book.
- We start with a survey of the unit and a fixed quote for the work.
- With your site team, the unit is switched off and isolated, then the area around it protected.
- We clean or change the filters as agreed, then clean the coils, fan and internal panels.
- We clean out the drain tray and make sure it drains.
- A TR19® certificate and photo report follow the clean.
How to prepare
- Move anything stored near the system
- Agree a time when the area can be out of use
- Mention any parking or loading restrictions
Get a fixed quote
Photos are enough for some jobs, while others need a look on site. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, you get a fixed price before any work starts.
Read more
Nearby places to Crayford
Also in Crayford
Leave it or put it right?
A clean unit feeds cleaner air into the ductwork, so the ducts and grilles stay cleaner between cleans. That makes the next inspection of a building in Crayford simpler. Even a site near Crayford that’s only busy part of the week needs its system checked on a schedule.
What you pay depends on the size of the system, the condition it’s in and access to every part of it. You get a fixed price before work begins, so you know where you stand.
Why choose Duct Doctor in Crayford
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Work around your opening hours, with 24/7 emergency cover
- A written report with photos after each visit
- Fully insured
See how cleaning jobs are priced and how to check a contractor.
What AHU cleaning looks like in Crayford
Going by the FSA’s register, there are about 22 schools, colleges and universities, about 33 care, childcare and hospital premises and about 4 hotels and B&Bs serving food in and around Crayford, up to about a mile and a half out. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. Crayford, about 12 miles from central London, is within our usual area. We work evenings, overnight and at weekends, so the visit fits around the site. The nearest hospital to Crayford is West Hill Hospital, about 1.3 miles east. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
Workplaces around Crayford station with an air handling unit need the filters, coils and drain tray looked at, as well as the ducts. Wherever a school like Wentworth Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Crayford is about 2 miles west of Dartford, in Kent. Crayford gets the same approach as every site we work on: diagnosis first, a fixed price, out-of-hours working where needed and a written report with pictures. Crayford is one of 922 places in Kent where we work for AHU cleaning. For sites nearby, see our London page, about 12 miles away.
Work in DA1, DA5 and DA7 follows the same survey, fixed quote and written report as everywhere else we cover. Local streets include Swan Lane, Dale Road and Ross Road, and we cover them all for AHU cleaning. If your site is just outside Crayford, we cover Bowmans (1 mile south), Barnes Cray (1 mile north-east), Barnehurst (1 mile north-west), Coldblow (1 mile south-west) and Wilmington (1 mile south). We also work in nearby towns such as Sevenoaks (12 miles south), Gravesend (9 miles east), Northfleet (7 miles east), Swanley (4 miles south), Swanscombe (5 miles east) and Windmill Hill (8 miles east).
Near you in Crayford
Typical jobs here are in premises near Haberdashers' Aske's Crayford Academy, The Bear and Ragged Staff pub and St Catherine's Catholic School and the streets around them. Crayford has its own railway station: Crayford station. Well-known places in the area include Bexley Museum (0.9 miles west) and West Hill Hospital (1.3 miles east). Open spaces near Crayford include Wansunt Pit.
Crayford questions
Can you get to a site in Crayford?
Yes, Crayford is part of our area, however small the site. Let us know about access, parking and anything unusual about getting there when you book.
Can the work in Crayford be done at night or at weekends?
Yes, nights and weekends are routine for us. The site is handed back ready to open. Tell us your opening hours when you ask for a quote.
Can one contract cover all our sites?
Yes. Tell us the addresses and what each needs and we’ll quote them together.
How much does AHU cleaning cost in Crayford?
Size, condition, access and working hours all affect the cost. Ask us for a fixed quote, usually ready within one working day.
What’s included in an AHU clean?
Filters, coils, drain trays, the fan and the internal surfaces are all covered. Filters are cleaned or changed as agreed in the quote.
Will we get paperwork for the AHU clean?
Yes. A TR19® certificate and photo report are sent after the clean, including anything we think needs attention.
What does TR19 mean?
TR19® is BESA’s specification for ventilation hygiene. Since 2019, TR19® Grease has been a standalone specification for grease in kitchen extract systems, while TR19® Air covers other supply and extract ductwork.
What accreditations do you have?
CHAS, SafeContractor, ISO 9001 and BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. We’ve been trading since 2009 and we’re fully insured.
Keeping the system healthy
Think of this as the after-treatment advice, short and simple:
- Look at the condensate drain whenever the unit is serviced
- Store the TR19 paperwork where auditors can find it
- Note any water around the unit or leaks below it
- Flag stale or damp smells in the supply air
Once the clean is done, we send a TR19® certificate and a report with before and after photos. They belong in the plant or maintenance log.
Make the drain tray part of every maintenance visit. A drain that’s cleared early never gets to the slime stage.
Signs you need AHU cleaning in Crayford
It matters for two reasons: air quality, since the unit feeds occupied rooms, and performance, since dirt makes it strain. For anyone working, learning or staying in a building in Crayford, that’s air they breathe for hours at a time.
These are the problems we see most often:
- Dust-coated heating and cooling coils
- Drain trays holding standing water
- Dirty filters cutting the airflow
- Stale or musty smells from the ventilation
Healthcare buildings such as West Hill Hospital, about 1.3 miles east, depend on their ventilation; if you manage a surgery, clinic or care home near Crayford, yours matters too.
Comparing quotes
- What hours they’ll be on site
- Whether a written report and pictures are included
- How areas they cannot reach will be recorded
- If they look at the system before pricing
For landlords and multi-site operators
Landlords, managing agents and facilities managers book us, not only the businesses that use the systems. Shared systems, like a riser serving several units, need a clear agreement on who books the work, and we can quote for the whole system.
We regularly work with managing agents. Send the address, what’s needed and how access works and we will come back with a fixed quote.
What your team can do, and what needs us
For ventilation and air handling systems, in-house care is mostly about checks: clear grilles, a log of filter changes and reporting anything odd. The inside of ducts and units needs a specialist.
Some jobs should never be done in-house: opening up ductwork, cleaning fans, drop testing fire dampers and measuring grease need training, the right equipment and safe access. That’s our job.