Essex · Air handling unit cleaning
Air handling unit cleaning in Great Dunmow, Essex
AHU cleaning for commercial sites in Great Dunmow and across Essex. BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease.
- Debris and leaves in the fresh air intake
- Rooms that smell stuffy when the system runs
- Filters that are clogged or overdue
AHU cleaning in Great Dunmow, done properly
An air handling unit is the heart of a building’s ventilation: air is pulled in, filtered, conditioned and sent out through the ducts. Anything that collects inside the unit can end up in the rooms it serves, which is why we clean the unit itself, not just the ducts. If you’re dealing with stale or musty smells from the ventilation and blocked condensate drains and slimy trays, we can put it right, from filter sections, dampers and louvres and drain trays onwards.
For a building near Great Dunmow, the visit is planned around how it’s used, and the journey is planned ahead. The method does not change: inspect first, clean, then record what was done.
The report is your system’s health record: dated, with photos, and showing what was done. For TR19® Grease cleans, the certificate comes through the BESCA Vent Hygiene Elite portal, ready for your insurer.
- Place
- Great Dunmow (CM6)
- Wider area
- Essex
- Reporting
- Written report with pictures
- Price
- Fixed quote, usually within a working day
- Hours
- Evenings, overnight and weekends; 24/7 emergencies
- Call
- 0345 646 2711
- Last updated
- 30 October 2026
How the visit works
We turn up at the time agreed with you, often in the evening, overnight or at the weekend so the site keeps working. Anything that needs to be off for the work is switched off and left to cool before we start, and the area around the work is covered and protected. On site, it takes a single shift for a typical unit, longer for large or heavily soiled ones. In a smaller place like Great Dunmow, parking is rarely the issue, but tell us about gates, roof access and opening hours.
- We agree a shutdown window that suits the building.
- Before cleaning, each section is photographed.
- We work through the unit from the intake to the outlet.
- We finish with the fan section and the drain tray.
- After photos are taken and the certificate issued.
Before we arrive
- Let us know when the site is closed or quiet
- Tell us where we can park and unload
- Dig out any earlier paperwork for the system
Get a fixed quote
Need a price for AHU cleaning? Please call 0345 646 2711 or drop us a line and tell us about the site. We will explain what we’d do and send a fixed quote before anything is booked.
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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.
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.
Also near Great Dunmow
Also in Great Dunmow
What a clean won’t put right
Not every problem is solved by AHU cleaning, and we’ll tell you before work begins. It doesn’t solve:
- Breakdowns that need a mechanical engineer
- Problems with the unit’s controls or sensors
- Damaged coils beyond cleaning
If you’re not sure, just ring 0345 646 2711, or email photos and we’ll give you a straight answer.
Parts of the system we cover
- Dampers and louvres
- Heating and cooling coils
- Filter sections
- Supply and extract fans
- Drain trays
- Internal panels
Between visits
How long the results last depends on use and care. Here’s what we suggest:
- Look at the condensate drain whenever the unit is serviced
- Keep the certificate and photo report with the plant records
- Keep inspection doors on the unit in good order
- Note any water around the unit or leaks below it
Restart the unit with your site team or maintenance contractor once we have finished. Check the drain tray is emptying over the first few days to confirm water is draining away.
Keep the area around the intake clear. Anything around the intake is likely to be drawn in.
What staff can safely do
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. Inside the ducts, risers and fan is specialist work, and that’s where we come in.
In-house cleaning and specialist cleaning do different jobs. A daily filter wipe and a weekly filter wash keep grease down at the front of the system, but grease that has passed the filters is out of reach. That part needs specialist access and equipment.
Leave it or put it right?
Dirt left in an air handling unit does not stay in the unit. It moves on into the ductwork and out into the rooms, which is why the unit and the ducts are best cleaned together. A site near Great Dunmow that has to close at short notice is hard to cover for.
Every site is different, so each one gets its own fixed quote. Size, access, the condition of the system and when we can work all play a part.
Why choose Duct Doctor in Great Dunmow
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Photo reports with every job
- In business since 2009
- A single point of contact for sites across the South East and London
Great Dunmow buildings and their air
There are about 4 schools, colleges and universities and about 3 caring premises (care homes, nurseries and hospitals) on the FSA’s food hygiene register in Great Dunmow and the streets around it, up to about 1.5 miles out. Where buildings like these have air handling units, filters, coils and drain trays need regular attention. Great Dunmow, about 32 miles from central London, is within our usual area. Evening, overnight and weekend visits are all possible.
Wherever a school like Dunmow St Mary's Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Great Dunmow is about 9 miles west of Braintree, in Essex. Whether your site is in the middle of Great Dunmow or further out, we cover AHU cleaning for every kind of premises, from a single unit to a large public building. We cover 644 places across Essex, large and small. Our Chelmsford page covers sites nearby, about 11 miles away.
All of CM6 is covered for AHU cleaning, from the main roads to the quietest streets. If you need AHU cleaning at premises on Market Place, High Street and Station Road or a nearby road, we can help. You will find Great Dunmow on the B1008 and B1057, which makes it straightforward for our technicians to reach for out-of-hours visits. If your site is just outside Great Dunmow, we cover Church End (1 mile north-east), Little Easton (2 miles north-west), Barnston (2 miles south-east), High Roding (3 miles south-west) and Great Canfield (3 miles south-west). Within a short drive, we also cover Chelmsford (11 miles south-east), Braintree (9 miles east), Harlow (13 miles south-west), Witham (13 miles south-east), Saffron Walden (11 miles north-west) and Halstead (13 miles east).
Landmarks near Great Dunmow
We work in commercial kitchens and buildings around Helena Romanes School and Sixth Form Centre and The Chequers Public House and the streets around them. The closest station to Great Dunmow is Stansted Airport station, about 4.3 miles west of the centre. Well-known places in the area include Little Easton Moat (1.6 miles north-west).
Do you need AHU cleaning in Great Dunmow?
Mechanical servicing keeps a unit running, but it doesn’t always include cleaning the inside. So a unit can be well maintained and still dirty.
If you notice any of these, it’s worth a diagnosis:
- Stale or musty smells from the ventilation
- Dust-coated heating and cooling coils
- Plant that has been serviced but not cleaned
- Blocked condensate drains and slimy trays
Ventilation work in and around Great Dunmow is risk-based: inspect, then clean what needs it.
What your quote should include
- Whether they recommend a next date
- If they look at the system before pricing
- How VAT is shown on the quote
- Whether the whole system is included, or only the parts that are easy to reach
FAQs for Great Dunmow
Can you come to Great Dunmow after we close?
Yes. We work evenings, overnight and at weekends. Your customers, staff or residents in Great Dunmow needn’t be disturbed. Let us know the hours you are closed and we will book within them.
Is Great Dunmow within the area you cover?
Yes, smaller places are covered as well as towns. A survey first, from photos or a visit, means we arrive with the right kit.
Do you offer maintenance contracts?
Yes. Send details of the systems and how they’re used, and we’ll suggest a schedule and quote for it.
How do you protect the area?
We cover floors and nearby surfaces with sheeting before any work starts, and anything we remove is contained. At the end, the area is cleaned down.
What about areas you cannot get to?
They’re listed in the report, never skipped quietly. You’ll know exactly which parts weren’t reached and why, along with a quote to put access in.
What information do you need?
The site address, the type of premises and your opening hours, along with a few pictures and any previous report.
Do you clean the ductwork as well?
Yes. We reach the ducts through access panels, with anything inaccessible recorded, and new panels can be fitted.
Which kinds of sites do you work on?
All kinds of commercial and public premises: from restaurants, pubs and hotels to schools, hospitals, care homes, offices, shops and food production sites. Work is timed around how each site runs.