Greater London · Air handling unit cleaning
Farthing Street AHU cleaning
AHU cleaning in Farthing Street from ventilation hygiene specialists trading since 2009. Out-of-hours visits and 24/7 emergency callout.
- Intake sections clogged with outdoor debris
- Blocked condensate drains and slimy trays
- Rooms that smell stuffy when the system runs
AHU cleaning in Farthing Street, done properly
Every supply and extract system relies on the air handling unit at its centre: it draws air in, filters it, heats or cools it and pushes it round the ductwork. Anything that collects inside the unit can end up in the rooms it serves, so cleaning the unit matters as much as cleaning the ducts. Typical jobs include air handling units due a clean after building work and leaves and litter drawn into the unit, across heating and cooling coils, drain trays and internal panels.
London buildings tend to keep their plant on the roof or below ground, so work in Farthing Street is often done in the evening or at weekends. Loading and parking are planned with the building first.
Think of the report as the system’s health record: a dated account with pictures of everything we did. Grease extract cleans are also certificated to TR19® Grease through the BESCA VHE portal and sits alongside the report.
- Place
- Farthing Street (BR6)
- Region
- Greater London
- Paperwork
- Report and pictures after the visit
- Quote
- A fixed price before any work starts
- When we work
- Evenings, overnight and weekends; 24/7 emergencies
- Phone
- 0345 646 2711
- Checked
- 30 October 2026
The process
We’re used to working while the site is closed. A lot of visits happen overnight or at weekends, so a kitchen or building can carry on as usual the next day. On site, the work takes a single shift for a typical unit, longer for large or heavily soiled ones. In Farthing Street, as across London, we normally work overnight or at weekends and hand the site back ready to open.
- We look at the unit and the plant area during the survey.
- We sheet the area and the unit is isolated.
- Each section is cleaned of dust, debris and slime.
- Coils and trays are cleaned and the condensate drain cleared.
- We close every panel, hand the unit back and send the report and certificate.
Getting ready for the visit
- Make sure someone can let us in and lock up afterwards
- Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas
- Clear the space around the work
Getting a quote
Getting a quote does not take long. Call or email with a few details and you’ll normally have a fixed price within one working day. Where a survey is needed, we arrange a time that suits the site.
Advice
Multi-site and managed buildings
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.
When the building owner and the occupier are different, the lease normally sets out who maintains what. We are happy to deal with either side and send the paperwork to whoever needs it.
What AHU cleaning can’t fix
We’d rather tell you now than book work that will not help, so here are the limits:
- Faulty motors, drives or bearings
- The supply and extract ducts, quoted separately
- Damaged coils beyond cleaning
Not sure which it is? You can give us a ring on 0345 646 2711 or email us and we will tell you honestly.
What the work covers
- Internal panels
- Drain trays
- Dampers and louvres
- Supply and extract fans
- Heating and cooling coils
- Filter sections
Staff cleaning versus specialist work
For ventilation and air handling systems, in-house care is mostly about checks: clear grilles, a log of filter changes and reporting anything odd. Cleaning inside ducts and units is specialist work.
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. What they can’t safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
Fixed quotes for AHU cleaning in Farthing Street
A fixed price needs a few facts first. We look at:
- The condition we find in the survey
- One-off work versus a regular cycle
- How many systems or sites are involved
- How big the system is
We don’t list prices on the website, because the cost depends on the site in front of us. For a fixed quote, ring 0345 646 2711 or use the quote form, and we will explain what it covers.
What to send for a quote
When you contact us, it’s useful to have:
- The roof, plant room or outside wall the system runs to
- Photos showing the whole system and its surroundings
- Where the site is and what kind of site it is
- Your last certificate, test record or report
To help us quote: where the site is, what it is and its opening hours, photos of the system and any previous report or certificate. Then call 0345 646 2711, or email photos.
Why deal with it now?
Facilities teams are often asked for evidence that the ventilation is looked after. A TR19® certificate and photo report give you that, for audits, tenants or your own peace of mind. It’s better booked as a planned job in Farthing Street than handled as an emergency.
What you pay reflects the actual work. That is why every job is surveyed first, and the price is agreed before we start.
Why choose Duct Doctor in Farthing Street
- We’re fully insured
- A fixed price before any work starts
- One contact for all your sites in London and the South East
- Survey first, then a fixed quote
Read our cost guide and our accreditations.
Farthing Street buildings and their air
Many London buildings have had their ductwork altered through several fit-outs, so an inspection comes first. The nearest hospital to Farthing Street is Princess Royal University Hospital, about 1.4 miles north. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes.
Wherever a school like Downe Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time. If you run a surgery, dental practice or care home near Farthing Street, clean ventilation matters as much to you as to a hospital like Princess Royal University Hospital (about 1.4 miles north).
Farthing Street is about 4 miles south-west of Orpington, in Greater London. If you need AHU cleaning in Farthing Street, please call us on 0345 646 2711 or email us for a fixed quote. We work across South East England and London, including Farthing Street. Farthing Street is one of 764 towns, villages and districts in Greater London we cover for AHU cleaning. There’s also a page for London, roughly 12 miles from Farthing Street.
We work across the BR6 postcode area for AHU cleaning and the streets around it. Whether your site is on Farthing Street, New Road Hill and Orange Court Lane or a nearby road, our technicians can take on the work. We also cover Downe (1 mile south-east), Leaves Green (1 mile south-west), Hazelwood (1 mile south-east), Keston (1 mile north-west) and Farnborough (1 mile north-east). Within a short drive, we also cover London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), Kensington (15 miles north-west), St Pancras (14 miles north-west) and Shoreditch (14 miles north-west).
Near you in Farthing Street
In Farthing Street, that means kitchens and buildings near Darrick Wood School, South Park and The Queens Head pub, among other places. The nearest railway station is Orpington station, roughly 2.6 miles north-east of the centre. Other landmarks nearby include Princess Royal University Hospital (1.4 miles north) and Crofton Roman Villa (2.5 miles north-east). The countryside around Farthing Street includes Betsom's Hill and West Kent Golf Course nature reserve.
Also near Farthing Street
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Farthing Street: your questions answered
Can you do AHU cleaning in Farthing Street?
Yes. We work across London and the South East, and Farthing Street is part of that. Just phone us on 0345 646 2711, or send details by email with a few details of the site.
Do you work at weekends in Farthing Street?
Yes, we can come after you close and finish before you open. Your customers, staff or residents in Farthing Street needn’t be disturbed. Your opening times are the first thing we ask for.
Do you offer maintenance contracts?
Yes. We run scheduled maintenance contracts, set at the interval the system needs. The report from each visit recommends the next date.
How much does AHU cleaning cost?
There’s no set price, as it depends on the job: the size of the system, its condition, access and when we can work. We fix the price before any work starts.
Do you survey before quoting?
Yes. We always survey first, from your pictures and details, or with a visit where necessary. Then you get a fixed quote.
Can one contract cover all our sites?
Yes. We work across South East England and London, so sites at different addresses can be planned together on one programme. Each site gets its own report and photos.
What does TR19 mean?
TR19® is the BESA specification for keeping ventilation systems clean. Since 2019, TR19® Grease has been a standalone specification for grease in kitchen extract systems, and TR19® Air covers general supply and extract systems.
How far ahead should we book?
For planned work, earlier is better, especially if the next clean or test is due soon. For emergencies, we take calls 24/7.
Aftercare tips
Results last longer with the right care. We suggest:
- Stick to the filter change plan
- Keep inspection doors on the unit in good order
- Book the next check in line with the report
- Flag stale or damp smells in the supply air
When we’ve closed the unit up, it can be restarted with your site team. Keep an eye on the condensate drain over the next few days to confirm water is draining away.
Keep the area around the intake clear. Anything around the intake is likely to be drawn in.