Surrey · Air handling unit cleaning
AHU Cleaning in Walliswood
Air handling unit cleaning for commercial sites in Walliswood and across Surrey. BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease.
- Units that have only ever had filter changes
- Coils clogged with dust and debris
- Debris and leaves in the fresh air intake
How we handle AHU cleaning in Walliswood
Coils are where a lot of the dirt ends up. A coated coil restricts airflow and makes the unit work harder. Coils are cleaned carefully, with methods chosen so the fins aren’t flattened. We’re often asked to deal with dirty filters cutting the airflow and dust-coated heating and cooling coils, across heating and cooling coils, drain trays and supply and extract fans.
In rural areas, ventilation units are often in roof voids or outbuildings, where filters and drain trays get forgotten.
Accreditations are easy to claim and worth checking. Ours are BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease, plus CHAS, SafeContractor and ISO 9001, with full insurance on top.
- Where
- Walliswood (RH5)
- Wider area
- Surrey
- Records
- Written report with pictures
- Quotes
- A fixed price before work begins
- Hours
- When your site is closed, plus a 24/7 line
- Call
- 0345 646 2711
- Checked
- 30 October 2026
What the work involves, 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.
Filters
What’s on the filters is a good clue to what’s further in. They’re photographed before and after for your records.
Places near Walliswood
Also in Walliswood
AHU cleaning around Walliswood
Horsham Hospital is the nearest hospital, about 5.5 miles south-east of Walliswood. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients. Walliswood, about 29 miles from central London, is within our usual area. Visits are booked around your hours, evenings and weekends included.
In Walliswood, we look inside the system before deciding what needs cleaning. Hospitals such as Horsham Hospital (about 5.5 miles south-east) show how much a building can rely on clean ventilation, and smaller healthcare sites near Walliswood are no different.
Walliswood is about 6 miles north-west of Horsham, in Surrey. Anywhere in RH5, we can carry out AHU cleaning at your premises. Walliswood is one of 395 towns, villages and districts in Surrey where we work for AHU cleaning. You can also see our page for Guildford, roughly 11 miles from Walliswood.
AHU cleaning in RH5 is surveyed, quoted and booked the same way as anywhere else. Local streets include Horsham Road, Standon Lane and Oakfields, all of which we cover for AHU cleaning. If your site is just outside Walliswood, we cover Mayes Green (1 mile north), Ewhurst Green (2 miles north-west), Ellen's Green (2 miles south-west), Ewhurst (2 miles north-west) and Cranleigh (4 miles west). Within a short drive, we also cover Guildford (11 miles north-west), Woking (15 miles north-west), Epsom (15 miles north), Horley (11 miles east), Redhill (12 miles north-east) and Reigate (11 miles north-east).
Landmarks near Walliswood
We work in commercial kitchens and buildings around Wallis Wood and The Scarlett Arms Public House and the streets around them. The nearest railway station is Ockley station, about 3.1 miles north-east of the centre. Other landmarks nearby include Abinger Castle (4.8 miles north) and Horsham Hospital (5.5 miles south-east). Green spaces nearby include Vann Lake and Leith Hill.
When something else is needed
To be straight with you, some problems need a different fix:
- Faulty motors, drives or bearings
- Coils that are corroded or leaking and need replacing
- The supply and extract ducts, quoted separately
Not sure which it is? You can call us on 0345 646 2711 or use the quote form and we will tell you honestly.
Where we work
- Supply and extract fans
- Filter sections
- Drain trays
- Dampers and louvres
- Heating and cooling coils
- Internal panels
What we do, step by step
At the end of the visit, someone from your team can look over the work with us. Anything we couldn’t reach or that needs attention is pointed out there and then, and it goes on the report too. All told, the work takes half a day to a full day per unit, with large plant planned over several shifts. Somewhere as small as Walliswood, the date and timings are agreed with you well before the day.
- The survey covers the unit, its access and how it can be shut down.
- We sheet the area and the unit is isolated.
- Dirt and debris are removed from each section.
- Coils and trays are cleaned and the condensate drain cleared.
- We close every panel, hand the unit back and send the report and certificate.
Before we arrive
- Clear the space around the work
- Find the previous report, if there is one
- Let us know when the site is closed or quiet
Ask for a quote
We don’t publish a price list, because no two systems are the same. Instead, we look at your site first, from photos or a survey, then send a fixed quote. To start, call 0345 646 2711 or drop us a line.
Related advice
What happens if it’s left?
Standing water in a drain tray does not clear itself. Left alone, it can overflow, leak into the plant area or ceiling below and spread smells through the system. Clearing it now is a much smaller job. Equipment tucked in a roof space or outbuilding near Walliswood rarely gets looked at unless someone books it.
A single site or a whole portfolio, we price it on the same basis: what needs doing, how we get to it and when. The price is fixed before any work starts.
Why us?
- Out-of-hours work and a 24/7 emergency line
- Every job surveyed first
- CHAS, SafeContractor and ISO 9001
- A written report with photos after every visit
See what affects the cost and our accreditations and certificates.
Landlords, agents and facilities managers
Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must assess and reduce fire risk, which may be the employer, owner, landlord, FM or managing agent. Where responsibility is shared, records matter even more.
We also work for facilities teams across offices, schools and healthcare in Walliswood and across Surrey. Work can be phased by floor, building or site around the people who use them.
What affects the cost of AHU cleaning
A fixed price needs a few facts first. We look at:
- How big the system is
- Parking and loading at the site
- Whether several sites go on one quote
- How easy every part is to reach
Working hours, access and the scale of the site all affect the cost. We take each of them into account, and the price is fixed before any work starts.
What we need to know
A few details help us quote accurately. When you get in touch, it helps to send:
- Your opening hours and when the area is out of use
- Any previous report or certificate
- How we’d reach plant on a roof or in a plant room
- Photos showing the whole system and its surroundings
Every quote begins with a look at the system, from your pictures and details or, where that is not enough, a survey on site. After that, you get a fixed price for the work so you know the cost before work begins.
Common questions in Walliswood
Can you work in Walliswood outside opening hours?
Yes. We work evenings, overnight and at weekends. It means the site in Walliswood keeps running as normal. Just give us a ring on 0345 646 2711 or email us with your opening times and we will plan around them.
Is Walliswood within the area you cover?
Yes, Walliswood is part of our area, however small the site. The journey is planned ahead, so a few details about the route help.
Which accreditations do you hold?
Our accreditations are CHAS, SafeContractor and ISO 9001, alongside BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. The Vent Hygiene Elite scheme is run by BESCA and audited independently.
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.
Do you offer emergency callouts?
Yes. Our emergency line runs 24/7 for anything that cannot wait until a planned visit. Ring any time and tell us what’s happened.
What types of premises do you cover?
Any site with a kitchen or a ventilation system to look after, from a single café to a large school. Hotels, schools, care homes, offices, shops and leisure sites are all part of our work.
What does AHU cleaning cost?
The cost depends on the size of the system, its condition, access and timing. Call for a fixed quote and we will normally reply within one working day.
Do you offer maintenance contracts?
Yes. Scheduled maintenance plans are part of what we do, with visits at the interval your system needs. The report from each visit recommends the next date.
Looking after it afterwards
Simple habits between visits make a real difference. We recommend:
- Don’t ignore odours coming through the grilles
- Report stiff or damaged access doors
- File each AHU report in the maintenance log
- Keep the area around the fresh air intake clear
When we have closed the unit up, it can be restarted with your site team. Check the drain tray is emptying over the first few days to confirm water is draining away.
Regular filter changes are the best protection an AHU has. Once filters clog, dirt starts getting past them.