Greater London · Air handling unit cleaning
Air handling unit cleaning in Sydenham, Greater London
AHU cleaning in Sydenham from ventilation hygiene specialists trading since 2009. Out-of-hours visits and 24/7 emergency callout.
- Stale or musty smells from the ventilation
- Dirty filters cutting the airflow
- Dirty fans and fan housings
AHU cleaning for kitchens and businesses in Sydenham
No two plant rooms are the same, from a small ceiling-mounted unit to a large rooftop plant. Every job starts with a survey, from pictures or on site, followed by a fixed quote, so you know where you stand. If you are dealing with condensate trays that won’t empty and plant that needs cleaning after a refit, we can help.
Across London, offices, hotels, schools and healthcare buildings rely on mechanical ventilation, much of it supplied through air handling units on roofs or in basements. For a building in Sydenham, dust settles in the units and ducts year after year.
Our accreditations include CHAS, SafeContractor and ISO 9001, and we are fully insured. On top of that, we are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we’ve been trading since 2009.
- Where
- Sydenham (SE26, SE20, SE23)
- Region
- Greater London
- Reporting
- Written report with photos
- Quotes
- Fixed quote, normally within a working day
- Hours
- When your site is closed, plus a 24/7 line
- Telephone
- 0345 646 2711
- Reviewed
- 30 October 2026
Different parts, different methods
Rooftop and plant room units
Units outside are exposed to weather and windblown debris. The intake section gets particular attention.
Heating and cooling coils
Heating and cooling coils have tightly packed fins that trap fine dust. They’re cleaned using methods that will not bend or flatten the fins.
Towns and villages near Sydenham
Also in Sydenham
Keeping the system healthy
After the visit, a few habits help the work last:
- Keep the area around the fresh air intake clear
- Keep inspection doors on the unit in good order
- Keep the certificate and photo report with the plant records
- Look at the condensate drain whenever the unit is serviced
We recommend when the unit should next be inspected or cleaned, taking into account how dirty it was. Under TR19® Air the timing is set by inspection and risk, not a fixed calendar.
Change or clean filters on time. Overloaded filters let more dirt through to the coils and fan.
Sydenham buildings and their air
Food Standards Agency data includes about 40 schools, colleges and universities, about 75 hospitals, care homes and childcare premises and about 5 hotels, B&Bs and guest houses in and around Sydenham, up to about a mile and a half out. Busy, occupied buildings like these are where clean supply air matters most. In London, ventilation plant is often on the roof or below ground, so the work is typically done out of hours. Sydenham’s nearest hospital, St Christopher's Hospice, is about under half a mile south-west. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients.
Workplaces around Sydenham station with an air handling unit need the filters, coils and drain tray looked at, as well as the ducts. For schools like Kirkdale School, the holidays are the usual time to inspect and clean ventilation.
Sydenham is about 3 miles south-east of East Dulwich, in Greater London. Sydenham gets the same approach as every site we work on: a survey first, a fixed quote, work timed around your hours and a report with pictures. Across Greater London, we cover 764 places, and Sydenham is one of them.
Every address in SE26, SE20 and SE23 is covered for AHU cleaning, from busy streets to back roads. Streets in the area include Byne Road, Lucas Road and Cator Road, and we cover them all for AHU cleaning. We also cover the places around Sydenham: Penge (1 mile south), Crystal Palace (1 mile south-west), Sydenham Hill (1 mile north-west), Perry Vale (1 mile north-east) and Anerley (1 mile south-west). Further out, we also cover London (5 miles north), City of Westminster (7 miles north-west), Marylebone (8 miles north-west), Kensington (8 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Around Sydenham
In Sydenham, that means kitchens and buildings near St Bartholomews's Church of England Primary School, Sydenham High School and Mayow Park. Sydenham has its own railway station: Sydenham station. Other landmarks nearby include Greenwich Castle (4.3 miles north-east) and Crystal Palace Museum (1 mile west). Open spaces near Sydenham include Dacres Wood and Knight's Hill.
Why deal with it now?
Leave an AHU uncleaned and the dirt does not stay put. It moves on into the ductwork and out into the rooms, so cleaning the ducts without the unit only goes so far. Every month a London system goes without attention adds to what has to be done later.
What you pay reflects the actual work. That’s why every job is surveyed first, and the price is agreed before any work starts.
What you get with us
- We diagnose before we treat
- One number for every site across the South East and London
- We are fully insured
- Trading since 2009
How it works
Night work is normal for us. A lot of visits happen overnight or at weekends, so the site can open as normal afterwards. On site, the work takes a single shift for a typical unit, longer for large or heavily soiled ones. If your building in Sydenham has sign-in rules, permits or key holders, mention them when you book.
- We agree a shutdown window that suits the building.
- We take before photos of each section of the unit.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- We finish with the fan section and the drain tray.
- We take after pictures and issue the certificate and report.
Getting ready for the visit
- Have your last certificate or report to hand
- Make sure someone can let us in and lock up afterwards
- Make sure equipment near the work can be switched off and left to cool
How to get a quote
For AHU cleaning in Sydenham, give us a ring on 0345 646 2711 or drop us a line. Let us know the site type and the opening hours, plus pictures or the previous report if they’re to hand. We typically send a fixed quote within one working day.
Read more
In-house cleaning or a specialist?
Away from the kitchen, the in-house job is mainly checking: keeping grilles clear, noting unusual noise or smells and logging filter changes. Cleaning inside ducts and units is specialist work.
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.
What a clean won’t put right
To be straight with you, there are a few things this work will not fix:
- Leaking heating or cooling coils
- Dirty ducts beyond the unit itself
- Ventilation that was badly designed in the first place
If in doubt, give us a ring on 0345 646 2711, or send details by email and we will say what we think.
What the work covers
- Internal panels
- Drain trays
- Filter sections
- Dampers and louvres
- Heating and cooling coils
- Supply and extract fans
Sydenham questions
Does London parking affect a job in Sydenham?
We plan it in advance, so let us know about loading bays, permits and access rules at the building. Where restrictions apply in the day, an evening or overnight visit usually gets round them.
Can you work in Sydenham outside opening hours?
Yes, nights and weekends are routine for us. The site is handed back ready to open. Just phone us on 0345 646 2711 or send us an email with your opening times and we’ll plan around them.
What do you do to protect the area?
With sheeting and covers, before anything else happens. The work is kept contained and clean down when we finish.
How much notice do you need?
It depends on the time you need and how big the job is. Tell us your preferred dates when you ask for a quote, and if it’s an emergency, call us any time.
What’s TR19?
BESA’s ventilation hygiene specification, with two parts that matter most here: TR19® Grease for kitchen extracts and TR19® Air for supply and extract systems. It isn’t law, but it’s the benchmark.
When should our AHU next be cleaned?
Under TR19® Air, cleaning is led by inspection and risk rather than a set calendar. We recommend a next date in each report.
Are you fully insured?
Yes. Full insurance covers our work and have been trading since 2009.
Can you clean the ducts connected to the AHU?
Yes. We clean supply and extract ductwork to TR19® Air as well. It’s often worth doing both at once, and we can quote for both.
When to call us in Sydenham
Filters catch most of the dust, but not all of it. What gets through settles on coils, fans and the inside of the casing, building up layer by layer.
Signs it’s time to call us include:
- Air handling units due a clean after building work
- Odours coming through the supply air
- Dirty coils holding back the airflow
- Air handling units never cleaned inside
Healthcare buildings such as St Christopher's Hospice, about within half a mile south-west, depend on their ventilation; if you manage a surgery, clinic or care home near Sydenham, yours matters too.
Questions to ask before you book
- Whether the quote shows VAT
- Whether they’re fully insured
- What happens if part of the system cannot be accessed
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor