Greater London · Air handling unit cleaning
Blackfen AHU cleaning
For cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces in Blackfen, one call is all it takes: survey, fixed quote, work and sign-off. CHAS and SafeContractor accredited, ISO 9001 and fully insured.
- Dirty fans and fan housings
- Blocked condensate drains and slimy trays
- Air handling units with blocked filters
AHU cleaning for kitchens and businesses in Blackfen
We clean the parts of the unit where dirt and moisture gather: the filter section, heating and cooling coils, drain trays, fan and casing. You get a TR19® certificate and a photo report showing the unit before and after. The work covers internal panels, heating and cooling coils and drain trays, and people most often call us about drain trays holding standing water and odours coming through the supply air.
Many London buildings have had their ventilation extended and altered through several fit-outs, with old runs left behind that are hard to reach. An inspection first shows where cleaning is needed in a building in Blackfen.
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, with full insurance on top.
- Place
- Blackfen (DA15, DA16, SE9)
- Region
- Greater London
- Paperwork
- Photo report after every visit
- Price
- A fixed quote up front
- Working hours
- Overnight and weekend work, 24/7 emergency callout
- Call
- 0345 646 2711
- Updated
- 30 October 2026
Why deal with it now?
Dirt left in an air handling unit doesn’t stay in the unit. It’s carried through the ductwork and out of the grilles, which is why the unit and the ducts are best cleaned together. Planning ahead in Blackfen lets you pick a quiet night rather than lose a busy one.
What you pay reflects the actual work. That’s why we survey first, from photos or on site, and the price is agreed before work begins.
Why Blackfen businesses choose us
- CHAS and SafeContractor accredited, with ISO 9001
- A written report with pictures after each visit
- Full insurance on every job
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
How the job changes from site to site
Internal casing and panels
Access doors and panels are opened in turn and closed properly afterwards before the unit is handed back.
Heating and cooling coils
Dirt on a coil slows the air and makes it harder for the coil to heat or cool. Cleaning restores the open path through the fins.
AHU cleaning in Blackfen: local notes
Going by the FSA’s register, there are about 36 schools, colleges and universities and about 54 caring premises (care homes, nurseries and hospitals) serving food within about 1.5 miles of central Blackfen. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. Eltham Community Hospital is the nearest hospital, about 1.7 miles west of Blackfen. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients. Ventilation cleaning in London buildings is usually planned for evenings or weekends.
If you manage offices or shops near Falconwood station, their ventilation can be inspected and cleaned out of hours. If you run a surgery, dental practice or care home near Blackfen, clean ventilation matters as much to you as to a hospital like Eltham Community Hospital (about 1.7 miles west).
Blackfen is about 2 miles east of Eltham, in Greater London. From the centre of Blackfen to the outskirts, we cover AHU cleaning for every kind of premises, from a single unit to a large public building. 764 places in Greater London are on our list, from busy centres to quieter spots. London is in our area too, around 9 miles away.
Every address in DA15, DA16 and SE9 is within our area for AHU cleaning, from busy streets to back roads. That includes premises on Days Lane, Gordon Road and Kent Avenue and the roads around them. Other places close to Blackfen include Falconwood (1 mile north), Avery Hill (1 mile west), East Wickham (1 mile north), New Eltham (1 mile south-west) and Longlands (1 mile south). We also work in nearby towns such as London (9 miles north-west), City of Westminster (11 miles north-west), Marylebone (11 miles north-west), Kensington (13 miles west), St Pancras (10 miles north-west) and Shoreditch (9 miles north-west).
Near you in Blackfen
Locally, jobs take us to businesses close to The George Staples pub, Harris Academy Falconwood and Shoulder of Mutton Green, among other places. For rail, the closest station is Falconwood station, roughly 0.8 miles north-west. Other landmarks nearby include Broadway Shopping Centre (2.3 miles east) and Eltham Community Hospital (1.7 miles west). Open spaces near Blackfen include Summer Hill and The Tarn.
Nearby places to Blackfen
Also in Blackfen
The process
There are three stages on the day: 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 pictures. The middle part takes longest, which takes a single shift for a typical unit, longer for large or heavily soiled ones. Most London sites cannot stop for the day, so work in Blackfen is typically done overnight, early in the morning or at weekends.
- First we agree when the unit can be switched off, including evenings or weekends.
- Before cleaning, each section is photographed.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- The fan and drain tray are cleaned and the drain checked.
- We take after pictures and issue the certificate and report.
Preparing for the visit
- Mention any sign-in, permit or induction we need
- Let us know how we reach the system, including roofs, risers and plant rooms
- Name a contact who can let us in at the agreed time
Getting a quote
To help us quote: where the site is, what it is and its opening hours, a few pictures and any previous report or certificate. Then phone us on 0345 646 2711, or email photos.
Read more
Questions from Blackfen
Can you work in Blackfen outside opening hours?
Yes. We work evenings, overnight and at weekends. Your customers, staff or residents in Blackfen needn’t be disturbed. Just give us a ring on 0345 646 2711 or use the quote form with your opening times and we will plan around them.
Can a school’s ventilation in Blackfen be done out of term time?
Yes. The holidays are the usual time for school work. There are about 36 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of Blackfen. Just ring 0345 646 2711 or email us with your term dates and we will plan around them.
What do you do to protect the area?
We start with protection: floor sheeting and covers over nearby surfaces and equipment. The area is left tidy, with our waste taken away.
Will we get paperwork for the AHU clean?
Yes, both a certificate and a report with photos. It includes a recommended date for the next check.
Which parts of an air handling unit do you clean?
Everything inside the unit that air passes over, from the intake and filters through the coils and fan to the outlet. The photo report shows each section before and after.
Will the ventilation be off while you clean?
Yes. The fan must be stopped and the unit isolated, so we plan it for a time that suits the building.
What about areas you cannot get to?
They’re listed in the report, never skipped quietly. The report says which parts couldn’t be reached and why, along with a quote to put access in.
Is there a survey before the work?
Yes. Photos often do the job, and larger or hidden systems get a visit.
What affects the cost of AHU cleaning
The price is fixed before any work begins. It’s based on:
- The condition we find in the survey
- The times the site is available
- The number of sites or systems
- A single visit or a regular plan
Every site is different, so we price each one individually. The size of the job, how we reach it, its condition and the working hours all play a part.
What to send for a quote
What to send for a quote:
- Problems your staff have spotted
- Your opening hours and when the area is out of use
- Any previous report or certificate
- The roof, plant room or outside wall the system runs to
If you need AHU cleaning in Blackfen, phone us on 0345 646 2711 or use the quote form. Tell us what kind of premises it is and when it’s open, and send photos or your last report if you can. We normally send a fixed quote within one working day.
When to call us in Blackfen
Dirt in an AHU matters in two ways: the unit supplies the air people breathe, and a dirty unit has to work harder. For anyone working, learning or staying in a building in Blackfen, that is air they breathe for hours at a time.
The symptoms we’re asked about most include:
- Condensate trays that won’t empty
- Units that have only ever had filter changes
- Plant that needs cleaning after a refit
- Coils clogged with dust and debris
If you manage a school such as Our Lady of the Rosary Catholic Primary School, ventilation cleaning is best booked for the holidays.
What to look for in a quote
- Exactly which parts of the system are covered
- When they can work, and whether that’s outside your opening hours
- Whether the quote is based on a survey or photos
- Whether inaccessible sections are listed on the report
Aftercare tips
To keep the system working properly between visits:
- Report musty smells from the vents right away
- Change filters on schedule and log each change
- Clear leaves and litter away from the intake
- Report stiff or damaged access doors
Keep filter changes on schedule between cleans, because good filters protect everything downstream. Record each change in the maintenance log.
Regular inspection under TR19® Air shows when cleaning is due instead of leaving it to guesswork.
When something else is needed
It’s worth knowing the limits before booking:
- Faulty motors, drives or bearings
- Controls and BMS settings that run the unit
- Leaking heating or cooling coils
If you are not sure, just call us on 0345 646 2711 or send us an email and we will give you a straight answer.
What the work covers
- Filter sections
- Heating and cooling coils
- Supply and extract fans
- Drain trays
- Internal panels
- Dampers and louvres