Hertfordshire · Air handling unit cleaning
Air handling unit cleaning in Graveley, Hertfordshire
AHU cleaning for Graveley, from a team that has been trading since 2009. Out-of-hours visits and 24/7 emergency callout.
- Condensate trays that will not empty
- Air handling units never cleaned inside
- Dirty fans and fan housings
How we handle AHU cleaning in Graveley
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. We are often asked to deal with filters that are clogged or overdue and plant that has been serviced but not cleaned, across filter sections, drain trays and dampers and louvres.
Somewhere as small as Graveley, ducted ventilation is usually limited to a school, a care home, a surgery or a converted business building, wherever there is one, but where it’s fitted, it needs the same inspection and cleaning as anywhere.
Good records are part of the job. Each visit is written up with pictures, covering the work done, any areas we couldn’t access and a recommended next date. File it in your maintenance log so it’s to hand when an insurer or inspector asks.
- Place
- Graveley (SG4)
- Wider area
- Hertfordshire
- Records
- Written report with pictures
- Price
- A fixed price before we start
- When we work
- Out of hours as standard, 24/7 emergency line
- Call
- 0345 646 2711
- Page updated
- 30 October 2026
Different parts, different methods
Internal casing and panels
Dust settles on every internal surface of the unit. We clean each section from intake to discharge.
Filters
Dirty filters cut airflow and let dirt slip past their frames. We clean the frames and rails so the filters sit tight.
AHU cleaning in Graveley: local notes
Food Standards Agency data includes about 8 schools, colleges and universities and about 7 care, childcare and hospital premises within 1.5 miles or so of the middle of Graveley. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. About 31 miles out from central London, Graveley is part of the South East area we work across. We work evenings, overnight and at weekends, so the visit fits around the site. For Graveley, the closest hospital is Lister Hospital, roughly 0.8 miles south. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital.
If you manage a school such as Graveley Primary School, ventilation cleaning is best booked for the holidays.
Graveley is about 2 miles north-west of Stevenage, in Hertfordshire. If you need AHU cleaning in Graveley, please ring 0345 646 2711 or send us an email for a fixed quote. Our area covers London and the South East, including Graveley. Our area takes in 381 places across Hertfordshire, from busy centres to quieter spots. Our Milton Keynes page covers sites nearby (25 miles or so).
All of SG4 is covered for AHU cleaning, from the main roads to the quietest streets. That includes premises on High Street, Oak Lane and Ashwell Close and nearby roads. Other places close to Graveley include Todd's Green (1 mile south-west), Great Wymondley (1 mile north-west), Little Wymondley (1 mile west), Titmore Green (1 mile south-west) and Lower Titmore Green (1 mile south-west). Further out, we also cover St Albans (14 miles south), Welwyn Garden City (10 miles south), Harpenden (10 miles south-west), Hitchin (3 miles west), Hoddesdon (15 miles south-east) and Hatfield (12 miles south).
Local landmarks in Graveley
We work in commercial kitchens and buildings around Waggon And Horses Public House, Church of Saint Nicholas and The John Henry Newman School, among other places. The closest station to Graveley is Stevenage station, about 2.4 miles south of the centre. A little further out are Wymondley Castle (1.1 miles west) and Stevenage Museum (2.4 miles south). For a walk, there’s Purwell Ninesprings.
Questions from Graveley
Can a school’s ventilation in Graveley be done out of term time?
Yes, holiday work suits schools best. The FSA’s register shows about 8 schools and colleges with food registrations within roughly a mile and a half of Graveley. Tell us your holiday dates and we’ll book the visit for when the site is empty.
Can you get to a site in Graveley?
Yes. Villages and rural sites across the South East are part of our work, Graveley included. A survey first, from photos or a visit, means we arrive with the right kit.
Can you clean the AHU out of hours?
Yes, if daytime working is not practical. Tell us when the unit can go off and we will work to that.
What information do you need?
A short description and a few pictures plus the address and your hours. We will ask for anything else we need.
How much notice should we give?
It depends on the time you need and how big the job is. Mention your preferred dates with your enquiry, and for anything urgent, ring our 24/7 emergency line.
Can we book visits on a schedule?
Yes, of course. Send details of the systems and how they’re used, and we’ll suggest a schedule and quote for it.
Will we get paperwork for the AHU clean?
Yes. You get a TR19® certificate plus before and after photos. Keep them in the maintenance log.
What’s TR19?
A BESA specification, with two parts that matter most here: TR19® Grease for kitchen extracts and TR19® Air for supply and extract systems. It is not legislation, but it’s the standard people check against.
When it’s something else
We will not sell you work that doesn’t address the problem, so here are the limits:
- Breakdowns that need a mechanical engineer
- Leaking heating or cooling coils
- Ventilation that was badly designed in the first place
If you are not sure, just ring 0345 646 2711 or send us an email and we will give you a straight answer.
Where we work
- Dampers and louvres
- Supply and extract fans
- Filter sections
- Drain trays
- Internal panels
- Heating and cooling coils
Between visits
How long the results last depends on use and care. We suggest:
- Look at the condensate drain whenever the unit is serviced
- Report stiff or damaged access doors
- Watch for drips or damp patches near the plant
- Diary the inspection date recommended in the report
We recommend when the unit should next be inspected or cleaned, based on what we found. Under TR19® Air the timing is set by inspection and risk, not a fixed calendar.
Check drain trays and condensate drains during routine maintenance. Catching a slow drain early stops standing water building up.
How we price AHU cleaning
The price is fixed before any work begins. It takes into account:
- What state the system is in
- Where the site is and how we reach it
- The size of the system
- A single visit or a regular plan
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 we start.
What we need to know
The more you tell us, the more accurate the quote. With your enquiry, please include:
- Detail shots of panels, filters and grilles
- Any previous report or certificate
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- Photos showing the whole system and its surroundings
Photos are the quickest way to a quote: the system from a couple of angles, plus any access panels or hatches. Tell us what kind of site it is and when it’s open, and many jobs can be priced from that alone.
For landlords and multi-site operators
When the building owner and the occupier are different, the lease normally sets out who maintains what. We can quote either party and send the paperwork to whoever needs it.
The Fire Safety Order 2005 puts the duty to manage fire risk on the responsible person, which may be the employer, owner, landlord, FM or managing agent. With shared responsibility, good records help everyone.
The process
When we arrive, we check the system against the survey or the pictures you sent. Anything unexpected is raised with you before we go further. After that, the work takes from a few hours for a compact unit to a day or more for a large one. A few pictures of the system help us make the most of a visit to a place like Graveley.
- We look at the unit and the plant area during the survey.
- The area is protected and the unit made safe.
- Dirt and debris are removed from each section.
- We clean the coils and clear the tray and drain.
- The unit is closed up and handed back, with a report to follow.
Before we arrive
- Clear the space around the work
- Tell us where we can park and unload
- Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas
Get a fixed quote
Need a price for AHU cleaning? Please call us on 0345 646 2711 or use the quote form and tell us about the site. We will explain what we’d do and send a fixed quote before you commit to anything.
Related advice
Towns and villages near Graveley
What else we do in Graveley
Common problems we fix in Graveley
Dirt in an AHU matters in two ways: the unit supplies the air people breathe, and a dirty unit has to work harder. For anyone working, learning or staying in a building in Graveley, that’s air they breathe for hours at a time.
Signs it’s time to call us include:
- Blocked condensate drains and slimy trays
- Units that have only ever had filter changes
- Dirty filters cutting the airflow
- Air handling units due a clean after building work
If you run a surgery, dental practice or care home near Graveley, clean ventilation matters as much to you as to a hospital like Lister Hospital (about 0.8 miles south).
Comparing quotes
- What’s included in the scope, part by part
- What hours they’ll be on site
- Whether inaccessible sections are listed on the report
- When the next visit should be, and why