Greater London · Air handling unit cleaning
AHU Cleaning in South Harrow
AHU cleaning in South Harrow from ventilation hygiene specialists trading since 2009. Evenings, overnight and weekends, plus a 24/7 emergency line.
- Intake sections clogged with outdoor debris
- Air handling units due a clean after building work
- Air handling units never cleaned inside
AHU cleaning in South Harrow
Drain trays under cooling coils are meant to empty. When the drain blocks, water sits there and the tray turns slimy, right in the path of the air going into the building. Cleaning and clearing it is a key part of the job. If you have intake sections clogged with outdoor debris and odours coming through the supply air, we can put it right, from drain trays, dampers and louvres and supply and extract fans onwards.
London buildings often depend on air handling units in plant rooms or on the roof to supply fresh air. For a building in South Harrow, dust settles in the units and ducts year after year.
Each visit ends with a written report and pictures, so there’s a dated record of the work. Kitchen extract cleaning to TR19® Grease is certificated through the BESCA Vent Hygiene Elite portal.
- Place
- South Harrow (HA2, HA1, UB5)
- Region
- Greater London
- Reporting
- Written report with photos
- Quotes
- A fixed price before we start
- When we work
- After hours by arrangement; emergencies any time
- Phone
- 0345 646 2711
- Checked
- 30 October 2026
Questions from South Harrow
Does London parking affect a job in South Harrow?
Parking and loading in London need planning, so tell us about bays, permits and building rules when you book. Where restrictions apply in the day, an evening or overnight visit usually gets round them.
Do you do school ventilation cleaning in South Harrow in the summer holidays?
Yes, out-of-term visits are normal for schools. There are about 21 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of South Harrow. Tell us your holiday dates and we will book the visit for when the site is empty.
When should our AHU next be cleaned?
TR19® Air takes a risk-based approach, so it depends on inspection rather than a fixed interval. We recommend a next date in each report.
Do you clean the ductwork as well?
Yes. We reach the ducts through access panels, with anything inaccessible recorded, with new panels fitted where necessary.
Can you fix a faulty AHU?
We clean the unit and flag faults rather than repair them, with pictures where it helps.
Which parts of an air handling unit do you clean?
Every section that collects dirt: filters, coils, tray, fan and panels. We confirm the scope after looking at the unit.
Do you need to switch the unit off?
Yes, while the clean is under way. We can work evenings, overnight or at weekends to keep disruption down.
Can you quote from pictures?
Yes, for many jobs. Send a few wide photos plus close-ups of panels, filters or grilles, and we usually come back within one working day. If photos aren’t enough, we’ll survey first.
Nearby places to South Harrow
What else we do in South Harrow
Part by part
Filters
What’s on the filters is a good clue to what’s further in. We photograph them for the report.
Rooftop and plant room units
Many AHUs sit on roofs or in plant rooms with limited access. Access is planned during the survey so the quote reflects it.
What we’re called out for in South Harrow
An AHU’s intake draws in outdoor air and everything in it: dust, pollen, leaves and debris. Most of it lands at the intake and the first stage of filters, and the finer material travels on.
Clients normally contact us when they notice something like this:
- Air handling units never cleaned inside
- Dirty coils holding back the airflow
- Drain trays holding standing water
- Units needing a clean before a new tenant or handover
Wherever a school like The Welldon Park Academy has ducted ventilation, a half-term visit keeps the work out of lesson time.
What your quote should include
- Which accreditations they hold, and whether you can check them
- What paperwork you get at the end
- What’s included in the scope, part by part
- Whether VAT is included
What happens if it’s left?
Dirt left in an air handling unit doesn’t stay in the unit. It moves on into the ductwork and out into the rooms, which is why the unit and the ducts are best cleaned together. Shared walls, risers and roofs mean a problem at one London site seldom stays put.
We don’t list prices on the website, because each job is priced on what it involves. For a fixed quote, ring 0345 646 2711 or send us an email, and we’ll explain what it covers.
What you get with us
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Each visit written up, with pictures
- Work around your opening hours, with 24/7 emergency cover
- CHAS, SafeContractor and ISO 9001
What we do, step by step
At the end of the visit, someone from your team can look over the work with us. Anything we couldn’t reach or that needs attention is pointed out there and then, and it goes on the report too. All told, the work takes half a day to a full day per unit, with large plant planned over several shifts. Security desks and permits-to-work are routine in London, so let us know what your building in South Harrow needs from us.
- First we agree when the unit can be switched off, including evenings or weekends.
- We take before pictures of each section of the unit.
- We work through the unit from the intake to the outlet.
- We finish with the fan section and the drain tray.
- We take after pictures and issue the certificate and report.
Before we arrive
- Have your last certificate or report to hand
- Tell us the best time to work, such as after service or at a weekend
- Let us know about permits to work or site inductions
Get a fixed quote
Quotes are quick. Send a few details and pictures, and we typically reply with a fixed quote within one working day. If we need to see the system first, we book a survey around your hours.
Advice
What AHU cleaning looks like in South Harrow
Going by the FSA’s register, there are about 21 schools, colleges and universities, about 63 hospitals, care homes and childcare premises and about 4 hotels and guest houses serving food in South Harrow and the streets around it, up to about 1.5 miles out. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. The nearest hospital to South Harrow is Clementine Churchill Hospital, about 0.9 miles east. If you run a surgery, clinic or care home, your ventilation deserves the same care as a hospital’s, on a smaller scale. Ventilation cleaning in London buildings is typically planned for evenings or weekends.
If you run an office near Northolt Park station, its supply ductwork can gather dust for years before anyone looks inside. Clementine Churchill Hospital, about 0.9 miles east, is the nearest hospital to South Harrow, and healthcare sites of every size need their supply air kept clean.
South Harrow is about 1 mile south of Harrow, in Greater London. Whether your site is in the middle of South Harrow or further out, AHU cleaning is available to all kinds of commercial premises, from small sites to large estates. We cover 764 places across Greater London, large and small. London is in our area too, about 12 miles from South Harrow.
Our technicians cover all of HA2, HA1 and UB5 for AHU cleaning and the streets around it. If you need AHU cleaning at premises on Park Lane, Grange Road and Dudley Road or anywhere close by, we can help. We also cover Roxeth (1 mile north-east), Harrow (1 mile north), Harrow on the Hill (1 mile east), Rayners Lane (1 mile north-west) and Northolt (1 mile south-west). We also work in nearby towns such as London (12 miles east), City of Westminster (9 miles east), Marylebone (9 miles east), Kensington (8 miles south-east), St Pancras (10 miles east) and Shoreditch (12 miles east).
What’s near South Harrow
We work in commercial kitchens and buildings around Orley Farm School, Northwick Park and St Dominic's Sixth Form College. The nearest railway station is Northolt Park station, roughly 0.5 miles south-west of the centre. A little further out are St. George's Shopping Centre (1.3 miles north-east) and Kodak Museum (2 miles north). Open spaces near South Harrow include Middle Lake and Northala Fields.
When it’s something else
We’d rather tell you now than book work that won’t help, so here are the limits:
- Problems with the unit’s controls or sensors
- A system that’s undersized for the building
- Coils that are corroded or leaking and need replacing
If you’re not sure, just call 0345 646 2711 or email us and we will give you a straight answer.
Parts of the system we cover
- Dampers and louvres
- Internal panels
- Heating and cooling coils
- Drain trays
- Supply and extract fans
- Filter sections
What your team can do, and what needs us
Logging matters as much as cleaning. A dated log of in-house cleaning and checks shows an inspector that the system is looked after between visits, next to our reports.
If your staff spot something between visits, like drips, unusual noise, smells or damaged filters, it’s best reported rather than tackled in-house. We can diagnose it and quote.
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.
Running several sites is easier with one contractor. We cover South East England and London, so a run of sites can go into one programme and kept on a regular cycle.