Surrey · Air handling unit cleaning
Air handling unit cleaning in Frimley Green, Surrey
AHU cleaning in Frimley Green from ventilation hygiene specialists trading since 2009. Evenings, overnight and weekends, plus a 24/7 emergency line.
- Debris and leaves in the fresh air intake
- Coils clogged with dust and debris
- Air handling units due a clean after building work
When something else is needed
It’s worth knowing the limits before booking:
- Problems with the unit’s controls or sensors
- Mechanical faults with motors, belts or bearings
- Damaged coils beyond cleaning
If you’re not sure, just call us on 0345 646 2711 or send us an email and we’ll give you a straight answer.
Where we work
- Filter sections
- Dampers and louvres
- Supply and extract fans
- Drain trays
- Heating and cooling coils
- Internal panels
AHU cleaning in Frimley Green
Drain trays under cooling coils are meant to empty. If the outlet blocks, standing water and slime build up, in the airstream that feeds the building. Cleaning and clearing it is a key part of the job. If you have debris and leaves in the fresh air intake and coils clogged with dust and debris, we can put it right, from supply and extract fans, internal panels and filter sections onwards.
In a smaller place like Frimley Green, buildings with ducted ventilation are more likely to be a school, a surgery, a care home or a small business unit than an office block. Smaller systems still gather dust and need inspecting.
Our accreditations include CHAS, SafeContractor and ISO 9001, and we’re fully insured. On top of that, we’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, trading since 2009.
- Where
- Frimley Green (GU16, GU14)
- Region
- Surrey
- Records
- Written report with pictures
- Quote
- A fixed price before work begins
- When we work
- When your site is closed, plus a 24/7 line
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
Frimley Green questions
Can the work in Frimley Green be done at night or at weekends?
Yes, we can come after you close and finish before you open. Your customers, staff or residents in Frimley Green needn’t be disturbed. Tell us your opening hours when you ask for a quote.
Can a school’s ventilation in Frimley Green be done out of term time?
Yes, and it’s the easiest time to do it. The FSA’s register shows about 22 schools and colleges with food registrations within roughly a mile and a half of Frimley Green. You can call 0345 646 2711, or email photos with the dates the site is empty.
Does the AHU have to be shut down for cleaning?
Yes. We can’t clean a running unit, so it’s switched off and made safe first. The shutdown is planned with whoever runs the building.
How much does AHU cleaning cost?
Size, condition, access and working hours all affect the cost. Ask us for a fixed quote and we’ll usually reply within one working day.
Can you fix a faulty AHU?
Mechanical repairs to the unit are for your HVAC maintenance contractor. We clean the unit and report anything we see that needs attention.
Is there a survey before the work?
Yes. Photos often do the job, and larger or hidden systems get a visit.
Which accreditations do you hold?
We hold CHAS, SafeContractor and ISO 9001, and we are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. Vent Hygiene Elite is run by BESCA and independently audited.
How long does an AHU clean take?
Typically the clean takes a single shift for a typical unit, longer for large or heavily soiled ones. We plan the shutdown around that, including evenings or weekends.
What the work involves, part by part
Filters
Dirty filters cut airflow and let dirt slip past their frames. The filter section is cleaned so new or cleaned filters sit properly.
Fans and fan sections
The fan section is cleaned with the unit switched off and isolated in agreement with the site.
Keeping the system healthy
Think of this as the after-treatment advice, in brief:
- Keep inspection doors on the unit in good order
- Keep filter changes on time and recorded
- Note any water around the unit or leaks below it
- Clear leaves and litter away from the intake
If the ductwork hasn’t been cleaned, consider it next. A clean unit feeding dirty ducts only solves half the problem, and we can quote for both.
Keep the area around the intake clear. Anything around the intake is likely to be drawn in.
Frimley Green buildings and their air
Going by the FSA’s register, there are about 22 schools, colleges and universities, about 19 caring premises (care homes, nurseries and hospitals) and about 3 hotels and B&Bs serving food across Frimley Green and its immediate surroundings (about a mile and a half). Where buildings like these have air handling units, filters, coils and drain trays need regular attention. For Frimley Green, the closest hospital is Frimley Park Hospital, roughly 1.3 miles north. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients. At about 31 miles from central London, Frimley Green sits well inside the area we cover. Evening, overnight and weekend visits are all possible.
Healthcare buildings such as Frimley Park Hospital, about 1.3 miles north, depend on their ventilation; if you manage a surgery, clinic or care home near Frimley Green, yours matters too. Workplaces around Farnborough North station with an air handling unit need the filters, coils and drain tray looked at, as well as the ducts.
Frimley Green is about 1 mile south of Frimley, in Surrey. Whatever kind of site you run in Frimley Green, we can take on AHU cleaning. Visits can be booked for evenings, overnight or weekends so the site keeps running. Across Surrey, we cover 395 places, and Frimley Green is one of them. We also work in Guildford, about 8 miles from Frimley Green.
Our technicians cover all of GU16 and GU14 for AHU cleaning and the streets around it. Local streets include Cross Lane, Sturt Road and Beech Road, and we cover them all for AHU cleaning. We also cover the places around Frimley Green: Frimley (1 mile north), Deepcut (1 mile north-east), Watchmoor (2 miles north-west), Camberley (2 miles north) and York Town (3 miles north-west). Larger places within reach include Guildford (8 miles south-east), Woking (7 miles east), Farnham (7 miles south-west), Egham (12 miles north-east), Walton-on-Thames (15 miles east) and Staines-upon-Thames (13 miles north-east).
What’s near Frimley Green
We work in commercial kitchens and buildings around National Aerospace Library, Prince of Wales pub and Henry Tyndale School. Other local landmarks include Sixth Form College (1.1 miles west) and Frimley Lodge Park (within half a mile south-east). Frimley Green’s nearest station is Farnborough North station, about 0.5 miles west of the centre. Well-known places in the area include Frimley Park Hospital (1.3 miles north) and Royal Army Dental Corps Historical Museum (2.4 miles south). The countryside around Frimley Green includes Danger Hill and Aunt's Pool.
Also in Frimley Green
When to call us in Frimley Green
Mechanical servicing keeps a unit running, but it doesn’t always include cleaning the inside. That means a unit can tick every service box and still be carrying years of dirt.
Look out for any of the following:
- Dust built up on fan impellers
- Air handling units due a clean after building work
- Coils clogged with dust and debris
- Rooms that smell stuffy when the system runs
Wherever a school like Cross Farm Infant School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Questions to ask before you book
- What insurance they carry
- How VAT is shown on the quote
- If they look at the system before pricing
- Which accreditations they hold, and whether you can check them
Why deal with it now?
Cleaning a unit while it only has light dust is quick. Leave it for years and dirt bakes onto coils and casings, particularly where damp has made it stick. Booking now means the visit to Frimley Green is planned around you, not forced by a breakdown.
Every site is different, so we price each one individually. The size of the job, how we reach it, its condition and the working hours all play a part.
Why book with us
- Fully insured
- We diagnose before we treat
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Trading since 2009
How the visit works
We are used to working while the site is closed. A lot of visits happen overnight or at weekends, so a kitchen or building can carry on as usual the next day. On site, the work takes a single shift for a typical unit, longer for large or heavily soiled ones. Your opening hours decide when we come to Frimley Green, not ours.
- We start with a survey of the unit and a fixed quote for the work.
- The unit is shut down with your site team and the area protected.
- Filters are dealt with as agreed, and the coils, fan and casing cleaned.
- Standing water and slime come out of the tray and the drain is checked.
- We close up the unit and send the certificate and before and after pictures.
Preparing for the visit
- Tell us where we can park and unload
- Mention any sign-in, permit or induction we need
- Clear the space around the work
Get a fixed quote
Want a quote for AHU cleaning? Please call 0345 646 2711, or send details by email with a few details about the site. We will explain what we’d do and send a fixed quote before you commit to anything.
Related advice
What staff can safely do
Staff cleaning and specialist work aren’t the same thing. A daily filter wipe and a weekly filter wash keep grease down at the front of the system, but they don’t reach the grease that builds up further in. That part needs specialist access and equipment.
When your team notices a problem between visits, such as dripping grease, a noisy fan, a smell or a filter that will not come clean, it’s best reported rather than tackled in-house. We’ll take a look and send you a fixed quote.