Surrey · Air handling unit cleaning
Air handling unit cleaning in Farnham, Surrey
AHU cleaning for Farnham, from a team that has been trading since 2009. Out-of-hours visits and 24/7 emergency callout.
- Fan sections that haven’t been cleaned in years
- Rooms that smell stuffy when the system runs
- Air handling units due a clean after building work
AHU cleaning in Farnham, done properly
An air handling unit is the heart of a building’s ventilation: it draws air in, filters it, heats or cools it and pushes it round the ductwork. Whatever builds up inside it travels with that air, which is why we clean the unit itself, not just the ducts. The work covers internal panels, heating and cooling coils and filter sections, and the jobs we see most are air handling units with blocked filters and coils clogged with dust and debris.
Many schools and offices in a town like Farnham have a mix of older and newer ventilation. The work starts with an inspection to decide what needs cleaning.
We’ve been trading since 2009, and we’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we carry full insurance.
- Where
- Farnham (GU9, GU10)
- Wider area
- Surrey
- Paperwork
- Photo report after every visit
- Quotes
- A fixed price before we start
- When we work
- Out of hours as standard, 24/7 emergency line
- Phone
- 0345 646 2711
- Checked
- 30 October 2026
Ventilation in Farnham buildings
Food Standards Agency records list about 10 schools, colleges and universities, about 13 care, childcare and hospital premises and about 3 hotels and B&Bs registered as food businesses within about 1.5 miles of central Farnham. Classrooms, bedrooms and care spaces are often served by ducted air, and that ductwork collects dust over time. For Farnham, the closest hospital is Fleet Community Hospital, roughly 5.8 miles north-west. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients. Farnham is about 36 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.
For workplaces around Farnham station with mechanical ventilation, cleaning can be done in the evening or at weekends. Healthcare ventilation, from large hospitals like Fleet Community Hospital (about 5.8 miles north-west) to small clinics, depends on clean filters, coils and ducts.
Farnham is about 6 miles south of Farnborough, in Surrey. Across the GU9 area, we cover AHU cleaning for commercial sites. We cover 395 places across Surrey, from busy centres to quieter spots. There’s also a page for Guildford, about 10 miles away.
Here we cover the GU9 and GU10 postcode area for AHU cleaning. If you need AHU cleaning at premises on Barncroft, Approach Road and Saxon Croft or anywhere close by, we can help. Being close to the A31 and A287, Farnham is simple for us to get to at any hour. Other places close to Farnham include Compton (1 mile east), Hale (1 mile north), Upper Hale (2 miles north), Runfold (2 miles east) and Heath End (2 miles north). We also work in nearby towns such as Guildford (10 miles east), Woking (12 miles north-east), Camberley (9 miles north), Frimley (8 miles north), Haslemere (9 miles south) and Cranleigh (14 miles east). As one of the bigger places in Surrey, Farnham has commercial sites of every size, and we cover all of them for AHU cleaning.
Near you in Farnham
Typical jobs here are in premises near Moor Park, William Cobbett Public House and Weydon School and the streets around them. Farnham has its own railway station: Farnham station. Nearby you will also find Museum of Farnham (under half a mile north-west) and Farnham Castle (0.6 miles north-west). Green spaces nearby include Farnham Park and Aunt's Pool.
Questions from Farnham
Can the work in Farnham be done at night or at weekends?
Yes, evening, overnight and weekend work is normal for us. It means the site in Farnham keeps running as normal. Your opening times are the first thing we ask for.
Can you do AHU cleaning in Farnham?
Yes, Farnham is within the area we cover across London and the South East. You can phone us on 0345 646 2711 or send us an email and let us know what needs doing.
Can you come out in an emergency?
Yes. Our emergency line runs 24/7, for problems that cannot wait. Ring any time and tell us what’s happened.
Does the AHU have to be shut down for cleaning?
Yes. Cleaning needs the unit off and isolated, and we time the work to suit the site.
Where does the waste go?
It leaves the site with us when we go. During the work, it’s contained so the area stays clean.
How much notice should we give?
Earlier is better, especially for out-of-hours work. We usually quote within one working day, and emergencies are covered by our 24/7 line.
Do you have insurance?
Yes, fully. CHAS and SafeContractor accreditation sit alongside it for clients who vet their contractors.
How long will the unit be out of action?
The work takes anything from half a day for one small unit to several shifts for a plant room full of them. Bigger units can be phased, so give us a ring on 0345 646 2711, or send details by email to talk it through.
Why act early in Farnham
Cleaning a unit while it only has light dust is quick. Leave it for years and dirt bakes onto coils and casings, especially where there’s been moisture. Booking now keeps it a routine visit to Farnham rather than an urgent one.
Combining work into one visit or one programme can make for a more efficient booking. Mention every system or site you need covered and we’ll price it together.
Why Farnham businesses choose us
- We are fully insured
- A fixed price before any work starts
- In business since 2009
- Survey first, then a fixed quote
Managing agents and facilities teams in Farnham
For anyone managing more than one site, we can plan visits across the whole estate and price them together. 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 a run of sites can go into one programme and kept on a regular cycle.
What AHU cleaning cannot fix
We won’t sell you work that doesn’t address the problem, so here are the limits:
- Ventilation that was badly designed in the first place
- Leaking heating or cooling coils
- Ductwork downstream of the unit, which is a separate clean
If you are not sure, just phone us on 0345 646 2711 or email us and we’ll give you a straight answer before you book.
Parts of the system we cover
- Heating and cooling coils
- Dampers and louvres
- Filter sections
- Drain trays
- Supply and extract fans
- Internal panels
Aftercare tips
Simple habits between visits make a real difference. We recommend:
- Report stiff or damaged access doors
- Diary the inspection date recommended in the report
- Store the TR19 paperwork where auditors can find it
- Make sure condensate is draining away
You receive a TR19® certificate and a photo report after the clean. They belong in the plant or maintenance log.
Keep the unit’s doors and panels in working order. Sections that are awkward to open are the ones that get skipped.
Do you need AHU cleaning in Farnham?
Filters catch most of the dust, but not all of it. What gets through settles on coils, fans and the inside of the casing, a little more each month.
These are the problems we see most often:
- Dust built up on fan impellers
- Leaves and litter drawn into the unit
- Units needing a clean before a new tenant or handover
- Odours coming through the supply air
School buildings such as Farnham College are normally done in the holidays, so classrooms aren’t disturbed.
What to look for in a quote
- How VAT is shown on the quote
- Whether the figure could change on the day
- If they look at the system before pricing
- Proof of insurance
How the job changes from site to site
Fans and fan sections
Every bit of air passes the fan, so a dirty fan sends dirt downstream. The impeller, its housing and the fan chamber are cleaned.
Drain trays
The drain tray collects water from the cooling coil. We clear standing water, clean out slime and check the outlet is draining.
The process
There’s very little for your team to do on the day. A contact on site lets us in at the agreed time and points us to the system, and we take it from there. Before we leave, the area is tidied and the paperwork follows. The more we can see of the system beforehand, the smoother the visit to Farnham will be.
- 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.
- The unit is closed up and handed back, with a report to follow.
Getting ready for the visit
- Have your last certificate or report to hand
- Clear the space around the work
- Mention any locked doors, roof access or ceiling voids
Ask for a quote
Quoting starts with a diagnosis, either from pictures and details you send or from a site visit. Then we send a fixed price, before we start.