Surrey · Air handling unit cleaning
AHU Cleaning in Downside
AHU cleaning in Downside from ventilation hygiene specialists trading since 2009. Evenings, overnight and weekends, plus a 24/7 emergency line.
- Air handling units never cleaned inside
- Odours coming through the supply air
- Dirty coils holding back the airflow
What AHU cleaning can’t fix
We won’t sell you work that doesn’t address the problem, so here are the limits:
- Leaking heating or cooling coils
- Building management system faults
- Mechanical faults with motors, belts or bearings
Not sure which it is? You can phone us on 0345 646 2711, or send details by email and we will tell you honestly before booking.
What we work on in Downside
- Dampers and louvres
- Drain trays
- Internal panels
- Heating and cooling coils
- Supply and extract fans
- Filter sections
How we handle AHU cleaning in Downside
Our AHU cleans for sites in Downside cover the parts that collect dirt: the filter section, heating and cooling coils, drain trays, fan and casing. Every clean comes with a TR19® certificate and before and after photos in a report. If you are dealing with dust built up on fan impellers and debris and leaves in the fresh air intake, we can put it right, from internal panels, supply and extract fans and filter sections onwards.
In rural areas, ventilation units are often in roof voids or outbuildings, where filters and drain trays get forgotten.
Our accreditations include CHAS, SafeContractor and ISO 9001, and we’re fully insured. We are also a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we’ve been trading since 2009.
- Location
- Downside (KT11)
- Region
- Surrey
- Reporting
- Report and photos after the visit
- Quotes
- A fixed price before we start
- Working hours
- When your site is closed, plus a 24/7 line
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
Nearby places to Downside
More services for Downside
Downside buildings and their air
There are about 6 schools, colleges and universities and about 9 care, childcare and hospital premises on the FSA’s food hygiene register in and around Downside, up to about a mile and a half out. Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. Epsom Cottage Hospital is the nearest hospital, about 5.1 miles north-east of Downside. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too. At about 19 miles from central London, Downside sits well inside the area we cover. Visits are booked around your hours, evenings and weekends included.
Wherever a school like St Matthew's CofE Aided Infant School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Downside is about 4 miles west of Leatherhead, in Surrey. Whatever kind of site you run in Downside, AHU cleaning is something we can help with. Visits can be booked for evenings, overnight or weekends so the site keeps running. Our Surrey coverage runs to 395 places, and Downside is one of them. There’s also a page for Guildford, roughly 8 miles from Downside.
Postcode districts we cover here for AHU cleaning: KT11. Whether your site is on Downside Common, Downsview Close and Deacon Close or anywhere close by, we can help. Close by, we work in Hatchford (1 mile west), Martyr's Green (1 mile south-west), Hatchford End (2 miles west), Whiteley Village (3 miles north) and Wisley (3 miles west). Further out, we also cover Guildford (8 miles south-west), Woking (7 miles west), Camberley (14 miles west), Epsom (6 miles east), Horley (14 miles south-east) and Redhill (12 miles south-east).
Landmarks near Downside
Around Downside, our work takes us to kitchens and buildings near The Plough Public House and Parkside School, among other places. The nearest railway station is Cobham & Stoke Dabernon station, roughly 1 mile north-east. Nearby you’ll also find Epsom Cottage Hospital (5.1 miles north-east) and Send and Ripley History Society Museum (3.8 miles west). Not far away are Jubilee Wood and Boldermere Lake.
Keeping the system healthy
Results last longer with the right care. We suggest:
- Do not ignore odours coming through the grilles
- Make sure condensate is draining away
- Stick to the filter change plan
- Diary the inspection date recommended in the report
Photos in the report cover the filters, coils, drain tray, fan and casing, and note any part we couldn’t get to. Any defects we noticed, like a leaking tray or damaged lining, are listed.
Keep the area around the intake clear. What’s near the intake ends up in the unit.
FAQs for Downside
Do you cover smaller places like Downside?
Yes. Villages and rural sites across the South East are part of our work, Downside included. The journey is planned ahead, so a few details about the route help.
Can you come to Downside after we close?
Yes. We work evenings, overnight and at weekends. Your customers, staff or residents in Downside needn’t be disturbed. When you give us a ring on 0345 646 2711, or send details by email, mention when the site is quiet.
Which sectors do you work in?
Any site with a kitchen or a ventilation system to look after, from a small pub to a hospital. We work with hotels, schools, care homes, offices, retail and leisure sites.
Do you repair air handling units?
We clean the unit and flag faults rather than repair them, with the details in the report.
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 as one programme. Each site gets its own report and photos.
Do you look at the system first?
Yes, every time. Diagnosis comes before treatment: the survey tells us what the system needs and how to reach it and the fixed quote is built on it.
Are you fully insured?
Yes. We are fully insured, and the details are available on request.
Does the AHU have to be shut down for cleaning?
Yes. We cannot clean a running unit, so it’s switched off and made safe first. We agree the timing with your site team.
When to call us in Downside
Filters that aren’t changed or cleaned on time clog up, cutting airflow and sometimes letting dirty air bypass them altogether. After that, the coils and fan collect what the filter should have caught.
If you notice any of these, it’s worth a diagnosis:
- Dirty fans and fan housings
- Air handling units never cleaned inside
- Coils clogged with dust and debris
- Rooms that smell stuffy when the system runs
Epsom Cottage Hospital, about 5.1 miles north-east, is the nearest hospital to Downside, and healthcare sites of every size need their supply air kept clean.
Questions to ask before booking
- Whether the whole system is included, or only the parts that are easy to reach
- Whether the price is fixed
- Whether a written report and photos are included
- Proof of insurance
In-house cleaning or a specialist?
Staff cleaning doesn’t replace a specialist visit; it supports it. Regular in-house cleaning slows the build-up, but hidden parts of the system still need specialist attention.
A few tasks are always specialist work: opening up ductwork, cleaning fans, drop testing fire dampers and measuring grease need training, the right equipment and safe access. Leave those to us.
Why act early in Downside
Leave an AHU uncleaned and the dirt doesn’t stay put. It’s carried through the ductwork and out of the grilles, so cleaning the ducts without the unit only goes so far. In a small place like Downside, a system that fails can take a site out of use.
Combining work into one visit or one programme often makes better use of the time. Tell us about everything you’d like looked at and we will price it together.
What you get with us
- A single point of contact for sites across the South East and London
- Work around your opening hours, with 24/7 emergency cover
- We are fully insured
- We diagnose before we treat
Different parts, different methods
Internal casing and panels
The inside walls and floor of the casing collect dust and debris. We clean each section from intake to discharge.
Filters
Every AHU relies on its filters to catch dust before it reaches the coils. We check them, and clean or change them as agreed in the quote, and the housing around them is cleaned too.
What we do, step by step
A visit follows the same order every time: sheeting and protection first, make the system safe, do the work, tidy up and leave you the report. The visit itself takes a single shift for a typical unit, longer for large or heavily soiled ones. A quick note on how to find the site and where to park makes a visit to Downside run smoothly.
- 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.
- You get a TR19® certificate and a photo report.
Before we arrive
- Tell us about site rules, permits or sign-in
- Plan for cooking equipment or plant to be off before we arrive
- Tell us where we can park and unload
Getting a quote
There’s no standard price list, because no two systems are the same. We look at your system first, from pictures or on a visit, then send a fixed quote. To get going, phone us on 0345 646 2711, or email photos.