Surrey · Air handling unit cleaning
Dunsfold AHU cleaning
Our technicians work in Dunsfold on cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces. Out-of-hours visits, a fixed quote and a written report with photos on every job.
- Stale or musty smells from the ventilation
- Debris and leaves in the fresh air intake
- Blocked condensate drains and slimy trays
Your questions about AHU cleaning in Dunsfold
Do you cover Dunsfold for AHU cleaning?
Yes, we work in Dunsfold and the places around it. Get in touch with the details and we’ll arrange a survey.
Is Dunsfold within the area you cover?
Yes, Dunsfold is part of our area, however small the site. The journey is planned ahead, so a few details about the route help.
Is a quote from photos possible?
Often, yes. With good pictures, the site type and your last report, we can price many jobs. Where we can’t see enough, we arrange a survey.
Do you need to switch the unit off?
Yes. The unit has to be shut down and isolated before it’s opened. The shutdown is planned with whoever runs the building.
Can you look after several sites?
Yes. Our area covers London and the South East, so sites at different addresses can be planned together as one programme. Every site has its own report.
What do you do to protect the area?
Protection goes down first: sheeting over floors, worktops and anything close to the work. We tidy up and take our waste away before we leave.
How long does it take to clean an air handling unit?
Typically the clean takes anything from half a day for one small unit to several shifts for a plant room full of them. We plan the shutdown around that, including evenings or weekends.
What does TR19 mean?
BESA’s ventilation hygiene specification, with two parts that matter most here: TR19® Grease for kitchen extract systems and TR19® Air for general ventilation. It isn’t law, but it’s the benchmark.
AHU cleaning in Dunsfold, done properly
Heating and cooling coils trap dust that gets past the filters. A coated coil restricts airflow and makes the unit work harder. We clean coils with methods suited to their condition, taking care not to damage the fins. The work covers internal panels, supply and extract fans and drain trays, and the jobs we see most are dirty fans and fan housings and debris and leaves in the fresh air intake.
Work in a small place like Dunsfold starts with agreeing access and timings, and the ventilation is inspected, cleaned and recorded the same as anywhere.
For insurers and inspectors, the record counts. That is why every job is written up in a report with pictures, and grease extract cleans come with a TR19® certificate issued through the BESCA Vent Hygiene Elite portal.
- Location
- Dunsfold (GU8)
- Wider area
- Surrey
- Records
- Report and photos after the visit
- Quote
- Fixed quote, normally within a working day
- Hours
- Evenings, overnight and weekends; 24/7 emergencies
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
What happens on the day
A visit follows the same order every time: protect the area, make the system safe, do the work, tidy up and hand over the paperwork. The visit itself takes anything from half a day for one small unit to several shifts for a plant room full of them. A quick note on how to find the site and where to park makes a visit to Dunsfold run smoothly.
- We agree a shutdown window that suits the building.
- We take before photos 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.
Preparing for the visit
- Name a contact who can let us in at the agreed time
- Mention any locked doors, roof access or ceiling voids
- Agree a time when the area can be out of use
Get a fixed quote
Need a price for AHU cleaning? Please give us a ring on 0345 646 2711, or send details by email with a few details about the site. We will explain what we’d do and send a fixed quote before you commit to anything.
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Fixed quotes for AHU cleaning in Dunsfold
Sites vary more than people expect. The main factors:
- Travel, parking and unloading
- A single visit or a regular plan
- Whether several sites go on one quote
- Site rules, permits and inductions
Working hours, access and the scale of the site can all change the price. We take each of them into account and give you a fixed price before we start.
Asking for a quote
What to send for a quote:
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- The roof, plant room or outside wall the system runs to
- Photos showing the whole system and its surroundings
- When the site is open and when it’s quiet
There’s no standard price list, because no two systems are the same. We look at your system first, from photos or on a visit, and then send you a fixed quote. To start, call us on 0345 646 2711, or send details by email.
Multi-site and managed buildings
Managing agents often deal with us directly. Tell us the site, the work and the access arrangements and we will come back with a fixed quote.
From a single site to a large estate, you get the same standard: diagnosis, a fixed price, work booked around your hours and a written report with photos.
Places near Dunsfold
More services for Dunsfold
Dunsfold buildings and their air
About 4.3 miles north-west of Dunsfold is Milford Hospital, the nearest hospital. If you run a surgery, clinic or care home, your ventilation deserves the same care as a hospital’s, on a smaller scale. At about 33 miles from central London, Dunsfold sits well inside the area we cover. Visits are booked around your hours, evenings and weekends included.
Ventilation work in and around Dunsfold is risk-based: inspect, then clean what needs it.
Dunsfold is about 9 miles south of Guildford, in Surrey. Sites in Dunsfold get the same service as everywhere we cover: a survey first, a fixed quote, work timed around your hours and a report with pictures. Our area takes in 395 places across Surrey, from busy centres to quieter spots. There’s also a page for Guildford, roughly 9 miles from Dunsfold.
Our technicians cover all of the GU8 postcode area for AHU cleaning and the roads nearby. If you need AHU cleaning at premises on Binhams Meadow, Dunsfold Common Road and Nugent Close or anywhere close by, we can help. We also cover Loxhill (1 mile north), Hascombe (2 miles north), Alfold Crossways (2 miles south-east), Elmbridge Village (2 miles north-east) and Grafham (3 miles north). Larger places within reach include Guildford (9 miles north), Woking (14 miles north), Farnham (12 miles north-west), Dorking (13 miles north-east), Frimley (15 miles north-west) and Haslemere (7 miles west).
Landmarks near Dunsfold
Typical jobs here are in premises near Fir Tree Copse and The Sun Inn Public House. The nearest railway station is Witley station, about 3.8 miles west. Other landmarks nearby include Milford Hospital (4.3 miles north-west). For a walk, there’s Lower Lake and Hydon's Ball.
Do you need AHU cleaning in Dunsfold?
Planned maintenance often covers belts, motors and filters but not cleaning. That means a unit can tick every service box and still be carrying years of dirt.
What we are most often called out for:
- Filters that are clogged or overdue
- Units needing a clean before a new tenant or handover
- Units that have only ever had filter changes
- Stale or musty smells from the ventilation
Hospitals such as Milford Hospital (about 4.3 miles north-west) show how much a building can rely on clean ventilation, and smaller healthcare sites near Dunsfold are no different.
What to look for in a quote
- Which accreditations they hold, and whether you can check them
- Whether the quote shows VAT
- Whether the price is fixed
- When they can work, and whether that is outside your opening hours
Different parts, different methods
Internal casing and panels
Loose or damaged linings inside a unit can break up into the airstream. Anything like that is recorded with pictures.
Fans and fan sections
The fan section is cleaned with the unit switched off and isolated in agreement with the site.
What a clean won’t put right
In fairness, some problems need a different fix:
- Coils that are corroded or leaking and need replacing
- Ventilation that was badly designed in the first place
- Building management system faults
Not sure which it is? You can call 0345 646 2711 or send us an email and we will tell you honestly.
Parts of the system we cover
- Filter sections
- Dampers and louvres
- Internal panels
- Drain trays
- Supply and extract fans
- Heating and cooling coils
Between visits
To keep the system working properly between visits:
- Note any water around the unit or leaks below it
- Diary the inspection date recommended in the report
- Do not ignore odours coming through the grilles
- Don’t store bins or materials near the intake
The report shows each section of the unit before and after, along with anything we couldn’t reach. Any defects we noticed, like a leaking tray or damaged lining, are listed.
Make sure access doors and panels on the unit open easily. If a section is hard to get into, it tends not to get checked.