Hertfordshire · Air handling unit cleaning
Todd's Green AHU cleaning
One call covers air handling unit cleaning in Todd's Green: survey, fixed quote, work and sign-off. Fully insured, with CHAS, SafeContractor and ISO 9001.
- Units that have only ever had filter changes
- Air handling units due a clean after building work
- Debris and leaves in the fresh air intake
AHU cleaning in Todd's Green, done properly
Our AHU cleans for sites in Todd's Green cover the parts that collect dirt: the filter section, heating and cooling coils, drain trays, fan and casing. Every clean comes with a TR19® certificate and before and after photos in a report. Typical jobs include dust-coated heating and cooling coils and dust built up on fan impellers, on supply and extract fans, dampers and louvres and filter sections.
In a village or hamlet like Todd's Green, few buildings have mechanical ventilation, but where it’s fitted, it needs the same inspection and cleaning as anywhere.
A written report with photos follows every visit, so there’s a dated record of the work. Where the work is a TR19® Grease clean, the certificate is issued through the BESCA Vent Hygiene Elite portal.
- Location
- Todd's Green (SG1)
- Region
- Hertfordshire
- Reporting
- Report and pictures after the visit
- Price
- Fixed quote, typically within a working day
- Hours
- When your site is closed, plus a 24/7 line
- Phone
- 0345 646 2711
- Updated
- 30 October 2026
What we are called out for in Todd's Green
An AHU’s intake draws in outdoor air and everything in it: dust, pollen, leaves and debris. The intake section and first filters take the brunt, and the finer material travels on.
Any of these means the system needs a check-up:
- Air handling units never cleaned inside
- Odours coming through the supply air
- Dirty fans and fan housings
- Dust-coated heating and cooling coils
Lister Hospital, about 0.6 miles east, is the nearest hospital to Todd's Green, and healthcare sites of every size need their supply air kept clean.
What your quote should include
- Whether they recommend a next date
- Whether the quote shows VAT
- Whether inaccessible sections are listed on the report
- Whether they’re fully insured
Also near Todd's Green
Also in Todd's Green
Staff cleaning versus specialist work
Your own staff can handle the daily basics: wiping canopies, washing grease filters and recording it in a log. What they can’t safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
Keep a record of what your team does. A simple log of filter washes, wipe-downs and checks shows an inspector that the system is looked after between visits, next to our reports.
AHU cleaning around Todd's Green
Food Standards Agency data includes about 10 schools, colleges and universities, about 12 caring premises (care homes, nurseries and hospitals) and about 3 hotels and B&Bs within 1.5 miles or so of the middle of Todd's Green. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. We cover Todd's Green, about 30 miles from central London, as part of our work across London and the South East. Evening, overnight and weekend visits are all possible. For Todd's Green, the closest hospital is Lister Hospital, roughly 0.6 miles east. If you run a surgery, clinic or care home, your ventilation deserves the same care as a hospital’s, on a smaller scale.
For schools like The John Henry Newman School, the holidays are the usual time to inspect and clean ventilation.
Todd's Green is about 2 miles north-west of Stevenage, in Hertfordshire. We carry out AHU cleaning for businesses, landlords and public buildings in Todd's Green and the rest of Hertfordshire. Across Hertfordshire, we cover 381 places, Todd's Green among them. You can also see our page for Milton Keynes, roughly 24 miles from Todd's Green.
Every address in SG1 is within our area for AHU cleaning, from the main roads to the quietest streets. Neighbouring places we cover for AHU cleaning include Lower Titmore Green (1 mile west), Titmore Green (1 mile west), Little Wymondley (1 mile north-west), Graveley (1 mile north-east) and Great Wymondley (1 mile north). Further out, we also cover Hemel Hempstead (15 miles south-west), St Albans (13 miles south), Welwyn Garden City (9 miles south), Harpenden (9 miles south-west), Hitchin (3 miles north-west) and Hoddesdon (15 miles south-east).
Landmarks near Todd's Green
Locally, jobs take us to businesses close to Hermit of Redcoats pub and Graveley Primary School and the streets around them. The closest station to Todd's Green is Stevenage station, about 1.7 miles south-east. A little further out are Lister Hospital (0.6 miles east) and Stevenage Museum (1.9 miles south-east). Green spaces nearby include Purwell Ninesprings.
Your questions about AHU cleaning in Todd's Green
Can the work in Todd's Green be done at night or at weekends?
Yes. We work evenings, overnight and at weekends. It means the site in Todd's Green keeps running as normal. Let us know the hours you’re closed and we will book within them.
Can ventilation in schools around Todd's Green be cleaned out of term?
Yes, holiday work suits schools best. Food Standards Agency records list about 10 schools, colleges and universities with registered kitchens within about a mile and a half of Todd's Green. Booking early in the term gives the best choice of holiday dates.
What if parts of the system cannot be reached?
We record them on the report, with pictures where possible, and we explain what access is needed, such as extra access panels in ductwork.
Are you insured?
Yes. We carry full insurance, and we have been trading since 2009.
How often should an air handling unit be cleaned?
There’s no single answer; it comes down to the building and the unit. Inspection tells you when cleaning is needed, and the report recommends a next date.
What is TR19?
It’s BESA’s specification and the benchmark insurers, fire officers and EHOs look to. It sets out inspection, cleaning and record keeping, and it takes a risk-based approach.
Which accreditations do you hold?
Our accreditations are CHAS, SafeContractor and ISO 9001, alongside BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. Vent Hygiene Elite is run by BESCA and independently audited.
How do you keep the site clean during the work?
We start with protection: floor sheeting and covers over nearby surfaces and equipment. We tidy up and take our waste away before we leave.
When it’s something else
In fairness, some problems need a different fix:
- Breakdowns that need a mechanical engineer
- Airflow problems caused by the system’s design
- Problems with the unit’s controls or sensors
If you are not sure, just call 0345 646 2711 or email us and we’ll give you a straight answer before you book.
Where we work
- Dampers and louvres
- Supply and extract fans
- Internal panels
- Drain trays
- Filter sections
- Heating and cooling coils
Different parts, different methods
Fans and fan sections
Before the fan is touched, the unit is shut down and made safe with your site team.
Heating and cooling coils
Cooling coils stay damp in use, so dirt on them can turn sticky. We clean the coil and the tray beneath it together.
Aftercare tips
How long the results last depends on use and care. Here’s what we suggest:
- Keep the area around the fresh air intake clear
- File each AHU report in the maintenance log
- Don’t ignore odours coming through the grilles
- Stick to the filter change plan
The report shows each section of the unit before and after, and note any part we couldn’t get to. Any defects we noticed, like a leaking tray or damaged lining, are listed.
Have the unit inspected regularly, in line with the risk-based approach of TR19® Air instead of leaving it to guesswork.
What happens on the day
Everything the job needs comes with us, from protective sheeting to tools and access equipment. All we need from you is clear access and the right equipment switched off. The visit takes one overnight shift for many single units, with bigger plant phased. If the van will struggle with a lane or gateway near Todd's Green, let us know and we will plan around it.
- First we agree when the unit can be switched off, including evenings or weekends.
- Before cleaning, each section is photographed.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- The fan and drain tray are cleaned and the drain checked.
- After pictures are taken and the certificate issued.
How to prepare
- Agree a time when the area can be out of use
- Make sure equipment near the work can be switched off and left to cool
- Mention any parking or loading restrictions
Ask for a quote
To get a fixed quote, give us a ring on 0345 646 2711, or send details by email with the site type, your trading hours and a short description of the system. Photos and the last report, if you have one, make the quote quicker. You’ll typically have a quote within one working day.
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What affects the cost of AHU cleaning
The survey tells us what the work involves. The main factors are:
- Any permits to work or inductions
- How big the system is
- The times the site is available
- A single visit or a regular plan
Kitchens, offices, schools and hospitals are all priced the same way: the size of the job, access, condition and working hours. Call for a fixed quote and we will explain each part.
What to send for a quote
You do not need the technical terms. It helps if you can send:
- The times we could work without disrupting the site
- Photos showing the whole system and its surroundings
- Where the site is and what kind of site it is
- Your last certificate, test record or report
Quoting starts with a diagnosis, from your photos 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.