Hertfordshire · Air handling unit cleaning
Air handling unit cleaning in Letchmore Heath, Hertfordshire
Air handling unit cleaning for commercial sites in Letchmore Heath and across Hertfordshire. BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease.
- Dirty coils holding back the airflow
- Filters that are clogged or overdue
- Units needing a clean before a new tenant or handover
About our AHU cleaning in Letchmore Heath
Our AHU cleans for sites in Letchmore Heath cover the parts that collect dirt: filters, coils, drain trays, fans and the internal panels. Every clean comes with a TR19® certificate and before and after photos in a report. Common call-outs are for filters that are clogged or overdue and leaves and litter drawn into the unit, on filter sections, dampers and louvres and internal panels.
For a building in or near Letchmore Heath, access is agreed in advance and the visit is planned around the journey.
Every visit ends with a written report and photos, so there’s a dated record of the work. Kitchen extract cleaning to TR19® Grease is certificated through the BESCA Vent Hygiene Elite portal.
- Location
- Letchmore Heath (WD25, WD6)
- Wider area
- Hertfordshire
- Paperwork
- Photo report after every visit
- Quotes
- A fixed quote up front
- Hours
- Overnight and weekend work, 24/7 emergency callout
- Call
- 0345 646 2711
- Reviewed
- 30 October 2026
What we do, step by step
There are three stages on the day: getting the area ready, doing the work and signing it off. Set-up means sheeting and making equipment safe, and the sign-off is a written report with pictures. The middle part takes longest, and that takes anything from half a day for one small unit to several shifts for a plant room full of them. Visits to a village like Letchmore Heath are booked in advance, at a time that suits whoever runs the site.
- First the unit is surveyed, from photos 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.
- Drain trays are cleared and cleaned and the outlet checked.
- We close up the unit and send the certificate and before and after pictures.
Preparing for the visit
- Find the previous report, if there is one
- Arrange a key holder or contact on site
- Clear the space around the work
Ask for a quote
Quoting starts with a diagnosis, either from pictures and details you send or from a site visit. Then we send a fixed price, before work begins.
Related advice
Common problems we fix in Letchmore Heath
Most units live out of sight on roofs, in plant rooms or in ceiling voids, so they’re easy to forget about. Months can pass without anyone looking inside.
If you notice any of these, it’s worth a diagnosis:
- Units needing a clean before a new tenant or handover
- Filters that are clogged or overdue
- Condensate trays that won’t empty
- Dirty fans and fan housings
For schools like Fair Field Junior School, the holidays are the usual time to inspect and clean ventilation.
What to look for in a quote
- If they look at the system before pricing
- What insurance they carry
- Whether the work can be done while the site is closed
- Proof of accreditation you can verify
Staff cleaning versus specialist work
A few tasks are always specialist work: entering ducts, working on fans, testing dampers and taking grease readings call for the right kit, training and safe access. Leave those to us.
If your staff spot something between visits, like drips, unusual noise, smells or damaged filters, it’s best reported rather than tackled in-house. We will take a look and give you a fixed quote.
What a clean won’t put right
Before booking, it helps to know what’s not included:
- Mechanical faults with motors, belts or bearings
- A system that’s undersized for the building
- Problems with the unit’s controls or sensors
Not sure which it is? You can call us on 0345 646 2711 or drop us a line and we’ll tell you honestly before booking.
Parts of the system we cover
- Heating and cooling coils
- Filter sections
- Drain trays
- Dampers and louvres
- Supply and extract fans
- Internal panels
FAQs for Letchmore Heath
Can ventilation in schools around Letchmore Heath be cleaned out of term?
Yes. Half-terms and the summer break are the natural time for school work. The FSA’s register shows about 12 schools and colleges with food registrations within roughly a mile and a half of Letchmore Heath. Tell us your holiday dates and we’ll book the visit for when the site is empty.
Is Letchmore Heath within the area you cover?
Yes, Letchmore Heath is part of our area, however small the site. Photos of the system and directions to the site help us plan the visit.
Can one contract cover all our sites?
Yes. Our area covers London and the South East, so we can schedule a run of sites on one programme. Every site has its own report.
What do you need from me for a quote?
The site address, the type of premises and your opening hours, plus photos of the system and your last certificate or report if you have one.
Do you give a certificate after the clean?
Yes. You receive a certificate and a report showing each section before and after, including anything we think needs attention.
Which accreditations do you hold?
Duct Doctor is a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we carry full insurance.
How often do AHUs need cleaning?
Under TR19® Air, cleaning is led by inspection and risk rather than a set calendar. We recommend a next date in each report.
What types of premises do you cover?
We work for restaurants, pubs, hotels, schools, colleges, hospitals, care homes, offices and shops, as well as food production and leisure sites.
Ventilation in Letchmore Heath buildings
Food Standards Agency data includes about 12 schools, colleges and universities and about 3 hotels and B&Bs in Letchmore Heath and the streets around it, up to about 1.5 miles out. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. Letchmore Heath’s nearest hospital, Shenley Hospital, is about 2.6 miles north-east. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes. Letchmore Heath, about 16 miles from central London, is within our usual area. Visits are booked around your hours, evenings and weekends included.
Healthcare buildings such as Shenley Hospital, about 2.6 miles north-east, depend on their ventilation; if you manage a surgery, clinic or care home near Letchmore Heath, yours matters too.
Letchmore Heath is about 2 miles north-east of Bushey, in Hertfordshire. For AHU cleaning in and around Letchmore Heath, it’s easy to get a fixed quote: please give us a ring on 0345 646 2711 or email us. We work across South East England and London, Letchmore Heath included. Letchmore Heath is one of 381 places in Hertfordshire where we work for AHU cleaning. You can also see our page for London, roughly 16 miles from Letchmore Heath.
Postcode districts we cover here for AHU cleaning: WD25 and WD6. Local streets include Back Lane, The Green and New Road, all of which we cover for AHU cleaning. We also cover Round Bush (1 mile north-west), Patchetts Green (1 mile west), Kemprow (1 mile north), Aldenham (1 mile north-west) and Radlett (1 mile north-east). Further out, we also cover Watford (3 miles west), Hemel Hempstead (8 miles north-west), St Albans (6 miles north), Welwyn Garden City (11 miles north-east), Harpenden (10 miles north) and Hoddesdon (15 miles north-east).
Near you in Letchmore Heath
Locally, jobs take us to businesses close to Bushey Meads School, Aldenham Country Park and Three Horseshoes Public House, among other places. The nearest railway station is Radlett station, about 1.5 miles north-east. A little further out are Radlett and District Museum (1.3 miles north-east) and Harlequin Centre (2.7 miles west). Not far away are Stanmore Common.
What affects the cost of AHU cleaning
The price is fixed before any work begins. It takes into account:
- Any permits to work or inductions
- How big the system is
- Whether it’s a one-off visit or part of a schedule
- What state the system is in
What you pay reflects the actual work. That’s why every job is surveyed first, and the price is agreed before we start.
Helping us quote
When you call or email, these details help:
- The times we could work without disrupting the site
- Photos showing the whole system and its surroundings
- Any previous report or certificate
- The postcode and the type of business
Photos are the quickest way to a quote: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Tell us what kind of site it is and when it’s open, and many jobs can be priced from that alone.
Places near Letchmore Heath
Other services in Letchmore Heath
Managing agents and facilities teams in Letchmore Heath
Facilities teams in offices, schools and healthcare sites book us too across Hertfordshire. Work can be phased by floor, building or site to keep disruption down.
Keeping records across a portfolio is half the battle. Each visit produces a dated report with photos, so you can show an insurer or inspector what was done at each site.
What happens if it’s left?
Cleaning a unit while it only has light dust is quick. Leave it for years and dirt bakes onto coils and casings, especially where there’s been moisture. A fault that closes a site in a village like Letchmore Heath affects everyone who depends on it.
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
- One contact for all your sites in London and the South East
- BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Work around your opening hours, with 24/7 emergency cover
See our cost guide and our accreditations.