Kent · Air handling unit cleaning
Speed Gate AHU cleaning
Air handling unit cleaning for commercial sites in Speed Gate and across Kent. CHAS, SafeContractor and ISO 9001, and fully insured.
- Debris and leaves in the fresh air intake
- Blocked condensate drains and slimy trays
- Stale or musty smells from the ventilation
How it works
Protection comes first: floors, worktops and anything near the work are covered. Then we make the system safe and start. The work on site takes one overnight shift for many single units, with bigger plant phased, and we clear up before we go. Somewhere like Speed Gate, lanes, gates and parking are worth mentioning in advance.
- We look at the unit and the plant area during the survey.
- The area is protected and the unit made safe.
- Each section is cleaned of dust, debris and slime.
- Coils and trays are cleaned and the condensate drain cleared.
- We close every panel, hand the unit back and send the report and certificate.
Preparing for the visit
- Agree a time when the area can be out of use
- Tell us where we can park and unload
- Plan for cooking equipment or plant to be off before we arrive
Getting a quote
Quoting starts with a diagnosis, either from photos and details you send or from a site visit. Then we send a fixed price so you know the cost before we start.
Advice
How we handle AHU cleaning in Speed Gate
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, once the unit has been shut down and isolated. The work covers filter sections, supply and extract fans and dampers and louvres, and common reasons people get in touch are dust-coated heating and cooling coils and air handling units never cleaned inside.
In a village or hamlet like Speed Gate, few buildings have mechanical ventilation, but those that do need it inspected and cleaned like any other.
Duct Doctor has been trading since 2009, and we are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we’re fully insured.
- Where
- Speed Gate (DA3)
- Wider area
- Kent
- Paperwork
- Photo report after each visit
- Quote
- A fixed quote up front
- Hours
- Out of hours as standard, 24/7 emergency line
- Call
- 0345 646 2711
- Page updated
- 30 October 2026
When it’s something else
We’d rather tell you now than book work that will not help, so these are the things it won’t cover:
- The supply and extract ducts, quoted separately
- Breakdowns that need a mechanical engineer
- A system that’s undersized for the building
Not sure which it is? You can call us on 0345 646 2711 or drop us a line and we will tell you honestly before booking.
Parts of the system we cover
- Internal panels
- Dampers and louvres
- Heating and cooling coils
- Filter sections
- Drain trays
- Supply and extract fans
Speed Gate buildings and their air
Food Standards Agency records list about 3 schools, colleges and universities registered as food businesses within roughly a mile and a half of the centre of Speed Gate. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. About 18 miles out from central London, Speed Gate is part of the South East area we work across. Visits are booked around your hours, evenings and weekends included. The nearest hospital to Speed Gate is Darent Valley Hospital, about 4.5 miles north. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
Healthcare ventilation, from large hospitals like Darent Valley Hospital (about 4.5 miles north) to small clinics, depends on clean filters, coils and ducts.
Speed Gate is about 5 miles south of Dartford, in Kent. We carry out AHU cleaning for commercial premises of every kind in Speed Gate and the rest of Kent. Speed Gate is one of 922 towns, villages and districts in Kent we cover for AHU cleaning. You can also see our page for Maidstone, about 13 miles away.
Every address in DA3 is within our area for AHU cleaning, from the main roads to the quietest streets. Close by, we work in Fawkham Green (1 mile south-east), West Yoke (1 mile east), Ash (1 mile south-east), Maplescombe (2 miles south-west) and West Kingsdown (2 miles south). Further out, we also cover Maidstone (13 miles south-east), Dartford (5 miles north), Sevenoaks (7 miles south-west), Gravesend (6 miles north-east), Tonbridge (12 miles south) and Northfleet (5 miles north-east).
Around Speed Gate
In Speed Gate, that means kitchens and buildings near The Rising Sun pub. The closest station to Speed Gate is Longfield station, about 2.3 miles north-east of the centre. Nearby you will also find Darent Valley Hospital (4.5 miles north) and Eynsford Castle (2.4 miles west).
Why act early in Speed Gate
If people in a building in Speed Gate complain about stuffy or smelly air, the AHU is worth looking at. Cleaning it deals with the cause rather than the symptom. Systems in rural buildings are often out of sight and out of mind.
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 make a difference.
Why choose Duct Doctor in Speed Gate
- Survey first, then a fixed quote
- Accredited under CHAS and SafeContractor, with ISO 9001
- One number for every site across the South East and London
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
See what affects the cost and our accreditations and certificates.
Different parts, different methods
Internal casing and panels
We open each section through its doors and close them securely when we’re done, and check every one is shut.
Filters
Filters are the first line of defence in the unit. We check them, and clean or change them as agreed in the quote, and the housing around them is cleaned too.
Speed Gate: your questions answered
Can you clean school ventilation in Speed Gate during the holidays?
Yes. The holidays are the usual time for school work. There are about 3 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of Speed Gate. Just give us a ring on 0345 646 2711 or send us an email with your term dates and we will plan around them.
Can the work in Speed Gate be done at night or at weekends?
Yes, we can come after you close and finish before you open. Your customers, staff or residents in Speed Gate needn’t be disturbed. Your opening times are the first thing we ask for.
Are you fully insured?
Yes. We are fully insured, and the details are available on request.
Can you fix a faulty AHU?
Motors, belts, controls and coils that need repair are a job for your maintenance contractor. We’ll flag anything we notice during the clean.
Can we book visits on a schedule?
Yes. Plans on a 3, 6 or 12-monthly cycle are available, depending on what the system needs.
Is there a report after cleaning?
Yes. You get a TR19® certificate plus before and after pictures. Keep them in the maintenance log.
Can you price the work without visiting?
Normally, yes. Send a few wide pictures plus close-ups of panels, filters or grilles, and we normally come back within one working day. If pictures aren’t enough, we’ll survey first.
Does the AHU have to be shut down for cleaning?
Yes. The unit has to be shut down and isolated before it’s opened. The shutdown is planned with whoever runs the building.
Between visits
Good habits slow the build-up between visits. Our tips:
- Note any water around the unit or leaks below it
- Make sure the unit’s access doors open easily
- Keep the certificate and photo report with the plant records
- Check the drain tray is emptying during routine visits
When we’ve closed the unit up, it can be restarted with your site team. Check the drain tray is emptying over the first few days to make sure it stays clear.
Make the drain tray part of every maintenance visit. Catching a slow drain early stops standing water building up.
What staff can safely do
For ventilation and air handling systems, in-house care is mostly about checks: clear grilles, a log of filter changes and reporting anything odd. The inside of ducts and units needs a specialist.
When your team notices a problem between visits, like drips, unusual noise, smells or damaged filters, it’s best reported rather than tackled in-house. We can diagnose it and quote.
Do you need AHU cleaning in Speed Gate?
No filter stops everything. The fine dust that passes the filters lands on the coils, the fan and the internal panels, building up layer by layer.
Most sites get in touch after spotting something like this:
- Air handling units never cleaned inside
- Blocked condensate drains and slimy trays
- Leaves and litter drawn into the unit
- Dirty filters cutting the airflow
If you manage a school such as Longfield Academy, ventilation cleaning is best booked for the holidays.
Before you book anyone
- Whether the whole system is included, or only the parts that are easy to reach
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
- When the next visit should be, and why
- What happens if part of the system cannot be accessed