Surrey · Air handling unit cleaning
Air handling unit cleaning in Frensham, Surrey
Our technicians work in Frensham on air handling unit cleaning. Out-of-hours visits, a fixed quote and a written report with pictures on every job.
- Air handling units with blocked filters
- Dust-coated heating and cooling coils
- Debris and leaves in the fresh air intake
Questions from Frensham
Can you clean school ventilation in Frensham during the holidays?
Yes, and it’s the easiest time to do it. The FSA’s register shows about 3 schools and colleges with food registrations within roughly a mile and a half of Frensham. You can phone us on 0345 646 2711, or send details by email with the dates the site is empty.
Is Frensham within the area you cover?
Yes, we work in villages as well as towns, and Frensham is covered. A survey first, from pictures or a visit, means we arrive with the right kit.
Which parts of an air handling unit do you clean?
The main parts are the filters, coils, drain tray, fan and inside of the casing. We confirm the scope after looking at the unit.
Can you clean the ducts connected to the AHU?
Yes. Ductwork is cleaned through access panels, and any sections we cannot reach are noted in the report, and new panels can be fitted.
Does the AHU have to be shut down for cleaning?
Yes. The unit has to be shut down and isolated before it’s opened. We agree the timing with your site team.
Will you repair the fan or motor?
We clean the unit and flag faults rather than repair them, with the details in the report.
What do you do with what you remove?
It’s contained and taken away. Grease, debris and waste water are collected as the work goes on, so it does not spread.
What’s TR19?
It’s BESA’s specification and the benchmark insurers, fire officers and EHOs look to. It covers how systems are inspected, cleaned and checked, and it takes a risk-based approach.
How we handle AHU cleaning in Frensham
Our AHU cleaning covers sites in Frensham and the rest of Surrey, in buildings such as offices, schools, healthcare sites and shops. Units are cleaned when the site can spare them, often evenings, overnight or weekends. We are often asked to deal with air handling units never cleaned inside and filters that are clogged or overdue, on heating and cooling coils, supply and extract fans and dampers and louvres.
In rural areas, ventilation units are often in roof voids or outbuildings, where filters and drain trays get forgotten.
Think of the report as the system’s health record: dated, with photos, and showing what was done. Grease extract cleans are also certificated to TR19® Grease through the BESCA VHE portal, ready for your insurer.
- Location
- Frensham (GU10)
- Wider area
- Surrey
- Reporting
- Report and pictures after the visit
- Quote
- A fixed quote up front
- Working hours
- After hours by arrangement; emergencies any time
- Telephone
- 0345 646 2711
- Updated
- 30 October 2026
Managing agents and facilities teams in Frensham
Whether it’s one building or many, you get the same standard: diagnosis, a fixed price, work booked around your hours and a written report with photos.
Running several sites is easier with one contractor. We work across London and the South East, so visits at different addresses can be planned together and kept to a regular schedule.
Why deal with it now?
Dirt left in an air handling unit does not stay in the unit. It’s carried through the ductwork and out of the grilles, so cleaning the ducts without the unit only goes so far. Equipment tucked in a roof space or outbuilding near Frensham rarely gets looked at unless someone books it.
Every site is different, so we price each one individually. Size, access, the condition of the system and when we can work all play a part.
Why choose Duct Doctor in Frensham
- Work around your opening hours, with 24/7 emergency cover
- One contact for all your sites in London and the South East
- Full insurance on every job
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
See how cleaning jobs are priced and our accreditations and certificates.
Frensham buildings and their air
Going by the FSA’s register, there are about 3 schools, colleges and universities serving food in and around Frensham, up to about a mile and a half out. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. We cover Frensham, about 38 miles from central London, as part of our work across London and the South East. A survey and a fixed quote come first, then the visit at a time that suits you. About 5.1 miles south-west of Frensham is Chase Community Hospital, the nearest hospital. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital.
Wherever a school like St Mary's CofE Aided Infant School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Frensham is about 3 miles south of Farnham, in Surrey. Whether your site is in the middle of Frensham or further out, AHU cleaning is available to all kinds of commercial premises, from a single unit to a large public building. Frensham is one of 395 towns, villages and districts in Surrey we cover for commercial clients. You can also see our page for Guildford, roughly 11 miles from Frensham.
Work in GU10 is surveyed, quoted and booked the same way as anywhere else. Streets in the area include The Street and Peakfield, and we cover them all for AHU cleaning. Other places close to Frensham include Millbridge (1 mile north), Shortfield Common (1 mile north), Crosswater (1 mile south-east), Tilford Reeds (2 miles north-east) and Tilford Common (2 miles east). We also work in nearby towns such as Guildford (11 miles north-east), Woking (14 miles north-east), Camberley (12 miles north), Farnham (3 miles north), Frimley (11 miles north) and Haslemere (6 miles south-east).
Landmarks near Frensham
In Frensham, that means kitchens and buildings near The Flashes and Edgeborough School, among other places. The nearest railway station is Farnham station, about 3.2 miles north. Nearby you will also find Farnham Castle (3.6 miles north) and Museum of Farnham (3.3 miles north). The countryside around Frensham includes Culverswell Hill and Farnham Heath.
Keeping the system healthy
After the visit, a few habits help the work last:
- Keep filter changes on time and recorded
- Look at the condensate drain whenever the unit is serviced
- Plan the next inspection before the last report gets filed away
- Flag stale or damp smells in the supply air
Photos in the report cover the filters, coils, drain tray, fan and casing, along with anything we couldn’t reach. It also notes faults we spotted, such as damaged panels or a blocked drain.
Check drain trays and condensate drains during routine maintenance. Catching a slow drain early stops standing water building up.
Nearby places to Frensham
Also in Frensham
Common problems we fix in Frensham
Mechanical servicing keeps a unit running, but it does not always include cleaning the inside. That means a unit can tick every service box and still be carrying years of dirt.
Clients normally contact us when they notice something like this:
- Plant that needs cleaning after a refit
- Dust built up on fan impellers
- Condensate trays that will not empty
- Coils clogged with dust and debris
Healthcare buildings such as Chase Community Hospital, about 5.1 miles south-west, depend on their ventilation; if you manage a surgery, clinic or care home near Frensham, yours matters too.
What to look for in a quote
- What’s included in the scope, part by part
- Whether inaccessible sections are listed on the report
- If they look at the system before pricing
- Whether they’re fully insured
Honest limits
An honest diagnosis matters more to us than a booking, so here’s what this work can’t put right:
- Coils that are corroded or leaking and need replacing
- Mechanical faults with motors, belts or bearings
- Dirty ducts beyond the unit itself
Not sure which it is? You can ring 0345 646 2711 or email us and we will tell you honestly.
Parts of the system we cover
- Internal panels
- Supply and extract fans
- Heating and cooling coils
- Filter sections
- Drain trays
- Dampers and louvres
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. Most of the time goes on the work itself, and that takes half a day to a full day per unit, with large plant planned over several shifts. Rural roads and tight entrances are worth telling us about before a visit to Frensham.
- The survey covers the unit, its access and how it can be shut down.
- We sheet the area and the unit is isolated.
- Each section is cleaned of dust, debris and slime.
- We clean the coils and clear the tray and drain.
- We close every panel, hand the unit back and send the report and certificate.
Preparing for the visit
- Name a contact who can let us in at the agreed time
- Tell us about site rules, permits or sign-in
- Plan for cooking equipment or plant to be off before we arrive
Getting a quote
We do not publish a 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, phone us on 0345 646 2711 or use the quote form.
Advice
Part by part
Heating and cooling coils
A dirty coil holds back the air and makes heating and cooling less effective. Cleaning restores the open path through the fins.
Drain trays
Condensate from the coil drips into a tray beneath it. We clear standing water, clean out slime and check the outlet is draining.