Hertfordshire · Air handling unit cleaning
Welham Green AHU cleaning
AHU cleaning for Welham Green, from a team that has been trading since 2009. Out-of-hours visits and 24/7 emergency callout.
- Stale or musty smells from the ventilation
- Units needing a clean before a new tenant or handover
- Air handling units never cleaned inside
AHU cleaning for kitchens and businesses in Welham Green
All the building’s air passes through the fan, so dust on its blades and housing ends up in the airstream. We clean the fan section along with the rest of the unit, with the unit switched off and made safe first. The work covers supply and extract fans, heating and cooling coils and drain trays, and common reasons people get in touch are air handling units never cleaned inside and leaves and litter drawn into the unit.
Around a place like Welham Green, ventilation systems tend to be in schools, surgeries, care homes and workplaces. Even a small system collects dust in its ducts and filters.
The report is your system’s health record: a dated account with pictures of everything we did. For TR19® Grease cleans, the certificate comes through the BESCA Vent Hygiene Elite portal and sits alongside the report.
- Where
- Welham Green (AL9, AL10)
- Wider area
- Hertfordshire
- Records
- Report and photos after the visit
- Quotes
- A fixed price before any work starts
- Working hours
- Overnight and weekend work, 24/7 emergency callout
- Phone
- 0345 646 2711
- Updated
- 30 October 2026
Staff cleaning versus specialist work
Logging matters as much as cleaning. A dated log of in-house cleaning and checks shows an inspector that the system is looked after between visits, alongside our reports.
Away from the kitchen, the in-house job is mainly checking: clear grilles, a log of filter changes and reporting anything odd. Cleaning inside ducts and units is specialist work.
Leave it or put it right?
When the unit is clean, less dirt reaches the ducts, so the whole system stays cleaner for longer. That makes the next inspection of a building in Welham Green simpler. Even a site near Welham Green that is only busy part of the week needs its system checked on a schedule.
You won’t find a price list here, because each job is priced on what it involves. For a fixed quote, call 0345 646 2711 or use the quote form, and we’ll explain what it covers.
Why Welham Green businesses choose us
- Fixed quotes, typically within one working day
- One contact for all your sites in London and the South East
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- We are fully insured
See how cleaning jobs are priced or how to check a contractor.
Multi-site and managed buildings
When the building owner and the occupier are different, it’s worth checking the lease for who maintains the systems. We can quote either party and send the paperwork to whoever needs it.
If you look after several sites, we can schedule visits across all of them on one quote. Every building has its own written report, so each one has its own record.
Welham Green: your questions answered
Do you work at weekends in Welham Green?
Yes, nights and weekends are routine for us. Your customers, staff or residents in Welham Green needn’t be disturbed. Tell us your opening hours when you ask for a quote.
Can a school’s ventilation in Welham Green be done out of term time?
Yes, out-of-term visits are normal for schools. There are about 4 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of Welham Green. You can give us a ring on 0345 646 2711 or drop us a line with the dates the site is empty.
Do you have a 24/7 line?
Yes, 24/7. Office hours are Monday to Friday, 8am to 6pm, with the emergency line covering every other hour.
What does AHU cleaning cost?
The cost depends on the size of the system, its condition, access and timing. Ask us for a fixed quote and we will normally reply within one working day.
How often do AHUs need cleaning?
There’s no single answer; it comes down to the building and the unit. Regular inspection shows when it’s due, and we will suggest an interval after the first clean.
What’s included in an AHU clean?
All the internal parts the air touches, from the intake and filters through the coils and fan to the outlet. You get a photo report showing each part before and after.
Can one contract cover all our sites?
Yes. Tell us the addresses and what each needs and we will quote them together.
Will we get paperwork for the AHU clean?
Yes. Every clean comes with a TR19® certificate and a photo report. Keep them in the maintenance log.
Also near Welham Green
Other services in Welham Green
What affects the cost of AHU cleaning
Your quote is based on your site. We take into account:
- Where the site is and how we reach it
- The number of sites or systems
- Any permits to work or inductions
- Access, including roofs, risers and ceiling voids
Whatever the type of site, the quote works the same way: the size of the job, access, condition and working hours. Call for a fixed quote and we’ll go through it with you.
What we need to know
When you contact us, it’s useful to have:
- A few general shots of the system
- How we’d reach plant on a roof or in a plant room
- Any access panels or hatches you can see
- Where the site is and what kind of site it is
We do not publish a price list, because every site is different. We look at your system first, from photos or on a visit, then send a fixed quote. To get going, call us on 0345 646 2711 or use the quote form.
What a clean won’t put right
To be straight with you, there are a few things this work will not fix:
- Leaking heating or cooling coils
- Airflow problems caused by the system’s design
- Mechanical faults with motors, belts or bearings
If you’re not sure, just ring 0345 646 2711 or drop us a line and we will give you a straight answer.
Where we work
- Filter sections
- Supply and extract fans
- Internal panels
- Drain trays
- Heating and cooling coils
- Dampers and louvres
AHU cleaning in Welham Green: local notes
Food Standards Agency records list about 4 schools, colleges and universities registered as food businesses across Welham Green and its immediate surroundings (about a mile and a half). Busy, occupied buildings like these are where clean supply air matters most. At about 17 miles from central London, Welham Green sits well inside the area we cover. We work evenings, overnight and at weekends, so the visit fits around the site. For Welham Green, the closest hospital is Queen Elizabeth II Hospital, roughly 3.5 miles north. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
Workplaces around Welham Green station with an air handling unit need the filters, coils and drain tray looked at, as well as the ducts. If you run a surgery, dental practice or care home near Welham Green, clean ventilation matters as much to you as to a hospital like Queen Elizabeth II Hospital (about 3.5 miles north). Wherever a school like St Mary's Church of England Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Welham Green is about 2 miles south of Hatfield, in Hertfordshire. Every kind of commercial site in Welham Green, we can take on AHU cleaning. We can work out of hours so trading isn’t interrupted. Our Hertfordshire coverage runs to 381 places, and Welham Green is one of them. You can also see our page for London, roughly 17 miles from Welham Green.
Every address in AL9 and AL10 is within our area for AHU cleaning, from busy streets to back roads. We cover sites on Station Road, Old Farmhouse Mews and Vincenzo Close and the roads around them. If your site is just outside Welham Green, we cover North Mymms (1 mile south), Colney Heath (1 mile west), Hatfield (2 miles north), Sleapshyde (2 miles west) and Smallford (3 miles north-west). Further out, we also cover Watford (9 miles south-west), Hemel Hempstead (10 miles west), Stevenage (12 miles north), St Albans (5 miles west), Welwyn Garden City (4 miles north) and Harpenden (8 miles north-west).
Around Welham Green
We work in commercial kitchens and buildings around Brookmans Park, The Hope and Anchor Public House and Chancellor's School. Welham Green has its own railway station: Welham Green station. Other landmarks nearby include Queen Elizabeth II Hospital (3.5 miles north) and The Bunker at Hatfield Police Station (2.3 miles north). Green spaces nearby include Gobions Wood.
How it works
Your trading hours come first. Most visits are booked for when the area is out of use, such as evenings, overnight, early mornings or weekends. Once we’re in, the area is sheeted and anything that has to be off is turned off and cooled, and the job takes one overnight shift for many single units, with bigger plant phased. Around Welham Green, access is normally simpler than in a town centre, though gates and roof access are worth mentioning.
- First the unit is surveyed, from pictures or a visit, and the scope agreed.
- 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.
- We clean out the drain tray and make sure it drains.
- You get a TR19® certificate and a photo report.
Before we arrive
- Clear the space around the work
- Tell us the best time to work, such as after service or at a weekend
- Allow time for equipment near the work to be turned off and cool down
Ask for a quote
To help us quote: the address, the type of site and when it’s open, pictures of the system and any previous report or certificate. Once you have those, give us a ring on 0345 646 2711, or send details by email.
Related advice
What the work involves, part by part
Drain trays
Drain trays can rust and leak over time. Their condition goes into the report with photos so repairs can be planned.
Internal casing and panels
Access doors and panels are opened in turn and closed properly afterwards before the unit is handed back.