Surrey · Air handling unit cleaning
Lower Bourne AHU cleaning
One call covers cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces in Lower Bourne, from survey to sign-off. CHAS and SafeContractor accredited, ISO 9001 and fully insured.
- Rooms that smell stuffy when the system runs
- Condensate trays that will not empty
- Coils clogged with dust and debris
Part by part
Fans and fan sections
Before the fan is touched, the unit is shut down and made safe in agreement with the site.
Rooftop and plant room units
Many AHUs sit on roofs or in plant rooms with limited access. We plan safe access as part of the survey, before we quote.
AHU cleaning in Lower Bourne
A cooling coil drips condensate into a tray that should drain away. When the drain blocks, water sits there and the tray turns slimy, right in the path of the air going into the building. Clearing and cleaning the tray is central to every AHU clean. The work covers dampers and louvres, heating and cooling coils and filter sections, and the jobs we see most are stale or musty smells from the ventilation and dust built up on fan impellers.
Around a place like Lower Bourne, ventilation systems tend to be in schools, surgeries, care homes and workplaces. Smaller systems still gather dust and need inspecting.
Duct Doctor has been trading since 2009, and we’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we carry full insurance.
- Location
- Lower Bourne (GU10, GU9)
- Wider area
- Surrey
- Paperwork
- Report and photos after the visit
- Quotes
- A fixed price before we start
- Working hours
- Evenings, overnight and weekends; 24/7 emergencies
- Telephone
- 0345 646 2711
- Updated
- 30 October 2026
Leave it or put it right?
Stuffy rooms and stale smells in a building in Lower Bourne can sometimes be traced back to the AHU. Cleaning it deals with the cause rather than the symptom. Systems on quieter sites still build up dirt and wear, just more slowly.
Whatever the type of site, the quote works the same way: how much there is, how we reach it, what state it’s in and when we can work. Ask for a fixed quote and we’ll go through it with you.
Why Lower Bourne businesses choose us
- We diagnose before we treat
- A single point of contact for sites across the South East and London
- In business since 2009
- Photo reports with every job
Read our cost guide and our accreditations.
Staff cleaning versus specialist work
A few tasks are always specialist work: entering ducts, working on fans, testing dampers and taking grease readings call for the right kit, training and safe access. That is our job.
Good housekeeping makes our visits easier, not unnecessary. Clean filters and tidy surfaces slow the build-up, but the parts you cannot see still need a specialist at the right interval.
Looking after it afterwards
To keep the system working properly between visits:
- Don’t ignore odours coming through the grilles
- Don’t store bins or materials near the intake
- Diary the inspection date recommended in the report
- Store the TR19 paperwork where auditors can find it
The report suggests a date for the next inspection or clean, based on what we found. TR19® Air is risk-based, so the interval depends on the unit and how the building is used.
Check drain trays and condensate drains during routine maintenance. A drain that is cleared early never gets to the slime stage.
The process
There are three stages on the day: set-up, the treatment itself and the sign-off. Getting ready means protecting surfaces and switching off what needs to be off, and the sign-off is a written report with pictures. The middle part takes longest, and that takes half a day to a full day per unit, with large plant planned over several shifts. Tell us about any gates, ladders or locked plant areas at your site near Lower Bourne when you book.
- 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.
How to prepare
- Arrange a key holder or contact on site
- Have your last certificate or report to hand
- Clear loose items from the work area
How to get a quote
Here’s what helps us quote: the address, the type of site and when it’s open, photos of the system and any previous report or certificate. Then give us a ring on 0345 646 2711 or send us an email.
Related advice
What affects the cost of AHU cleaning
Every site gets its own quote. These are the things that affect it:
- The condition of the system
- Site rules, permits and inductions
- Whether it’s a one-off visit or part of a schedule
- The number of sites or systems
We don’t list prices on the website, because the cost depends on the site in front of us. Call for a fixed quote, and we will explain what it covers.
Helping us quote
To speed up the quote, send us:
- The site address and the type of premises
- How we’d reach plant on a roof or in a plant room
- When the site is open and when it’s quiet
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
Photos are enough for some jobs, while others need a look on site. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, the quote is fixed before any work is booked.
Multi-site and managed buildings
For anyone managing more than one site, we can schedule visits across all of them on one quote. Each site gets its own report and photos, so records stay tidy.
Running several sites is easier with one contractor. We cover South East England and London, so visits at different addresses can be planned together and kept to a regular schedule.
Also near Lower Bourne
Other services in Lower Bourne
Lower Bourne: your questions answered
Do you work in villages like Lower Bourne?
Yes, Lower Bourne is part of our area, however small the site. Photos of the system and directions to the site help us plan the visit.
Can you come to Lower Bourne after we close?
Yes, we can come after you close and finish before you open. That way a site in Lower Bourne does not have to lose a day’s trading. Let us know the hours you’re closed and we’ll book within them.
Do you give a certificate after the clean?
Yes. You receive a certificate and a report showing each section before and after, including anything we think needs attention.
How do you protect the area?
With sheeting and covers, before anything else happens. We keep the work contained and leave the area clean.
Do you repair air handling units?
The clean includes noting faults, but repairs sit with your maintenance contractor, with the details in the report.
What does TR19 mean?
A BESA specification in two main parts: TR19® Grease for kitchen extract systems and TR19® Air for general ventilation. It isn’t law, but it’s the benchmark.
How long will the unit be out of action?
Expect it to take one overnight shift for many single units, with bigger plant phased. The unit’s size and condition make the biggest difference, and we will confirm the time when we quote.
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.
What AHU cleaning looks like in Lower Bourne
Food Standards Agency records list about 11 schools, colleges and universities and about 8 care, childcare and hospital premises registered as food businesses in Lower Bourne 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. Lower Bourne is about 37 miles from central London, well within the area we cover across London and the South East. We work evenings, overnight and at weekends, so the visit fits around the site.
Classrooms and halls at schools such as Farnham College are easiest to work in when pupils are away. An inspection comes first for any ventilation job around Lower Bourne, so the cleaning matches what’s there.
Lower Bourne is about 1 mile south of Farnham, in Surrey. Every kind of commercial site in Lower Bourne, we can take on AHU cleaning. We can work out of hours so trading is not interrupted. Across Surrey, we cover 395 places, and Lower Bourne is one of them. You can also see our page for Guildford, about 10 miles away.
Here we cover the GU10 and GU9 postcode area for AHU cleaning. If you need AHU cleaning at premises on Fox Road, Ford Lane and Kiln Lane or a nearby road, our technicians can take on the work. You will find Lower Bourne on the A287, so it’s easy for us to get to for out-of-hours visits. Neighbouring places we cover for AHU cleaning include Tilford Reeds (1 mile south-east), Shortfield Common (1 mile south), Millbridge (2 miles south), Tilford (2 miles east) and Frensham (2 miles south). Further out, we also cover Guildford (10 miles east), Woking (12 miles north-east), Camberley (10 miles north), Frimley (8 miles north), Haslemere (8 miles south) and Cranleigh (14 miles east).
Near you in Lower Bourne
We work in commercial kitchens and buildings around Underdown nature reserve, Highfield South Farnham School and The Fox Public House. For rail, the closest station is Farnham station, about 1.1 miles north. A little further out are Museum of Farnham (1.3 miles north-west) and Farnham Castle (1.6 miles north). Not far away are Culverswell Hill and Aunt's Pool.