Surrey · Air handling unit cleaning
Air handling unit cleaning in Fernhill, Surrey
We cover Fernhill for air handling unit cleaning. Out-of-hours visits, a fixed quote and a written report with photos on every job.
- Filters that are clogged or overdue
- Odours coming through the supply air
- Dirty coils holding back the airflow
How we handle AHU cleaning in Fernhill
An air handling unit is the heart of a building’s ventilation: air is pulled in, filtered, conditioned and sent out through the ducts. Whatever builds up inside it travels with that air, which is why we clean the unit itself, not just the ducts. The work covers supply and extract fans, internal panels and heating and cooling coils, and common reasons people get in touch are air handling units with blocked filters and leaves and litter drawn into the unit.
Work in a small place like Fernhill starts with agreeing access and timings.
For insurers and inspectors, the record counts. So every job comes with a written report and pictures, and grease extract cleans come with a TR19® certificate issued through the BESCA Vent Hygiene Elite portal.
- Location
- Fernhill (RH6)
- Wider area
- Surrey
- Records
- Photo report after each visit
- Quote
- A fixed quote up front
- Working hours
- Evenings, overnight and weekends; 24/7 emergencies
- Telephone
- 0345 646 2711
- Page updated
- 30 October 2026
Ventilation in Fernhill buildings
Going by the FSA’s register, there are about 4 caring premises (care homes, nurseries and hospitals) and about 3 hotels, B&Bs and guest houses serving food within about 1.5 miles of central Fernhill. Busy, occupied buildings like these are where clean supply air matters most. We cover Fernhill, about 24 miles from central London, as part of our work across London and the South East. Evening, overnight and weekend visits are all possible. Langley Green Hospital is the nearest hospital, about 2.9 miles south-west of Fernhill. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients.
Healthcare ventilation, from large hospitals like Langley Green Hospital (about 2.9 miles south-west) to small clinics, depends on clean filters, coils and ducts. School buildings such as Oakwood School are usually done in the holidays, so classrooms are not disturbed.
Fernhill is about 2 miles south-east of Horley, in Surrey. Sites in Fernhill get the same service as everywhere we cover: a survey first, a fixed quote, work timed around your hours and a report with pictures. Fernhill is one of 395 towns, villages and districts in Surrey we cover for AHU cleaning. We also work in Guildford, around 20 miles away.
AHU cleaning in RH6 follows the same survey, fixed quote and written report as everywhere else we cover. AHU cleaning is available to premises on Peeks Brook Lane and Donkey Lane and nearby roads. If your site is just outside Fernhill, we cover Burstow (1 mile east), Shipley Bridge (1 mile south), Tinsley Green (1 mile south-west), Keeper's Corner (1 mile east) and Copthorne (1 mile south). Larger places within reach include Epsom (14 miles north-west), Redhill (6 miles north), Ewell (15 miles north), Reigate (6 miles north-west), Caterham (9 miles north) and Dorking (10 miles north-west).
Landmarks near Fernhill
We work in commercial kitchens and buildings around The Shipley Bridge pub. The closest station to Fernhill is Gatwick Airport station, roughly 1 mile west of the centre. Well-known places in the area include County Mall (3.6 miles south-west) and Langley Green Hospital (2.9 miles south-west). For a walk, there’s Hedgecourt Lake.
Fixed quotes for AHU cleaning in Fernhill
We quote each job individually. This is what makes a difference:
- Parking and loading at the site
- Access, including roofs, risers and ceiling voids
- The scale of the work
- The condition we find in the survey
Working hours, access and the scale of the site all affect the cost. Each of those is built into the quote and give you a fixed price before we start.
Asking for a quote
Many jobs can be priced from pictures and some basics. Useful things to send:
- Where the site is and what kind of site it is
- Any previous report or certificate
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Your opening hours and when the area is out of use
Here’s what helps us quote: the address, the type of site and when it’s open, pictures of the system and any previous report or certificate. Then ring 0345 646 2711 or send us an email.
How the visit works
Everything the job needs comes with us, including protection sheets, the right tools and access kit. You only need to give us clear access and switch off what needs to be off. On site, the work takes half a day to a full day per unit, with large plant planned over several shifts. A few photos of the system help us make the most of a visit to a place like Fernhill.
- 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.
- The unit is closed up and handed back, with a report to follow.
Getting ready for the visit
- Mention any sign-in, permit or induction we need
- Mention any parking or loading restrictions
- Mention any locked doors, roof access or ceiling voids
Get a fixed quote
Some systems can be priced from pictures; others need a survey. Big or complicated sites, and systems that are hard to see in pictures, get a survey first. Either way, you get a fixed price before work begins.
Related advice
What the work involves, part by part
Filters
Filters are the first line of defence in the unit. We check them, and clean or change them as agreed in the quote, and the housing around them is cleaned too.
Drain trays
Standing water in a tray sits right where the air passes. We clean it and report anything about the tray or drain that needs fixing.
Fernhill: your questions answered
Can you come to Fernhill after we close?
Yes, out-of-hours work is a big part of what we do. Your customers, staff or residents in Fernhill needn’t be disturbed. When you phone us on 0345 646 2711 or email us, mention when the site is quiet.
Can you get to a site in Fernhill?
Yes, we work in villages as well as towns, and Fernhill is covered. Photos of the system and directions to the site help us plan the visit.
Can we book visits on a schedule?
Yes. Send details of the systems and how they’re used and we will propose a schedule with a fixed quote.
What if parts of the system cannot be reached?
The report shows them clearly. Often the fix is extra access, such as new panels in ductwork, and we can fit those.
How long will the unit be out of action?
Typically the clean takes one overnight shift for many single units, with bigger plant phased. We plan the shutdown around that, out of hours if needed.
Will you repair the fan or motor?
Mechanical repairs to the unit are for your HVAC maintenance contractor. We will flag anything we notice during the clean.
Can you price the work without visiting?
Often, yes. With good photos, the site type and your last report, we can price many jobs. Larger or hidden systems need a survey on site first.
Do you clean the ductwork as well?
Yes. We reach the ducts through access panels, with anything inaccessible recorded, and new panels can be fitted.
Nearby places to Fernhill
Also in Fernhill
What staff can safely do
Some jobs should never be done in-house: entering ducts, working on fans, testing dampers and taking grease readings call for the right kit, training and safe access. Leave those to us.
If your staff spot something between visits, such as dripping grease, a noisy fan, a smell or a filter that won’t come clean, they should report it rather than try to fix it. We will take a look and give you a fixed quote.
Between visits
Here’s the after-treatment advice, in brief:
- Look at the condensate drain whenever the unit is serviced
- Keep inspection doors on the unit in good order
- Keep the certificate and photo report with the plant records
- Keep filter changes on time and recorded
Keep filter changes on schedule between cleans, as that does more than anything to keep the unit clean. Record each change in the maintenance log.
Change or clean filters on time. Once filters clog, dirt starts getting past them.
Honest limits
Not every problem is solved by AHU cleaning, and we will tell you before we start. It will not put right:
- Ductwork downstream of the unit, which is a separate clean
- Coils that are corroded or leaking and need replacing
- Ventilation that was badly designed in the first place
Not sure which it is? You can ring 0345 646 2711, or send details by email and we’ll tell you honestly.
Parts of the system we cover
- Filter sections
- Drain trays
- Supply and extract fans
- Internal panels
- Heating and cooling coils
- Dampers and louvres
Leave it or put it right?
Cleaning a unit while it only has light dust is quick. Years of build-up make the job longer and harder, particularly where damp has made it stick. It’s worth booking a check, because nobody sees inside a duct day to day.
We do not list prices on the website, because the cost depends on the site in front of us. For a fixed quote, ring 0345 646 2711 or email us, and we will explain what it covers.
Why choose Duct Doctor in Fernhill
- Work around your opening hours, with 24/7 emergency cover
- One number for every site across the South East and London
- Photo reports with every job
- In business since 2009
Take a look at what affects the cost or our accreditations and certificates.