Hertfordshire · Air handling unit cleaning
Air handling unit cleaning in Gravesend, Hertfordshire
AHU cleaning across Gravesend and nearby, booked around your opening hours and finished with a written report and photos.
- Odours coming through the supply air
- Drain trays holding standing water
- Dirty filters cutting the airflow
About our AHU cleaning in Gravesend
Our AHU cleaning covers sites in Gravesend and the rest of Hertfordshire, in buildings such as offices, schools, healthcare sites and shops. Units are cleaned when the site can spare them, often evenings, overnight or weekends. If you’re dealing with fan sections that haven’t been cleaned in years and leaves and litter drawn into the unit, we can help.
Somewhere as small as Gravesend, ducted ventilation is typically 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.
For insurers and inspectors, the record counts. So every job comes with a written report and photos, plus a TR19® certificate through the BESCA VHE portal where the work is a TR19® Grease clean.
- Location
- Gravesend (SG11)
- Wider area
- Hertfordshire
- Paperwork
- Photo report after each visit
- Quote
- Fixed quote, typically within a working day
- Hours
- Evenings, overnight and weekends; 24/7 emergencies
- Telephone
- 0345 646 2711
- Last updated
- 30 October 2026
When something else is needed
Not every problem is solved by AHU cleaning, and we’ll tell you before any work starts. It will not put right:
- Dirty ducts beyond the unit itself
- Coils that are corroded or leaking and need replacing
- Controls and BMS settings that run the unit
Not sure which it is? You can phone us on 0345 646 2711 or email us and we will tell you honestly before booking.
Where we work
- Dampers and louvres
- Drain trays
- Internal panels
- Heating and cooling coils
- Supply and extract fans
- Filter sections
More services for Gravesend
In-house cleaning or a specialist?
Some jobs should never be done in-house: entering ducts, working on fans, testing dampers and taking grease readings call for the right kit, training and safe access. That’s our job.
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. What they cannot safely do is clean inside the ductwork, the fan or the risers, and that’s where we come in.
Between visits
Simple habits between visits make a real difference. Our advice:
- Keep the area around the fresh air intake clear
- Make sure the unit’s access doors open easily
- Do not ignore odours coming through the grilles
- Check the drain tray is emptying during routine visits
Restart the unit with your site team or maintenance contractor once we’ve finished. Keep an eye on the condensate drain over the next few days to confirm water is draining away.
Have the unit inspected regularly, in line with the risk-based approach of TR19® Air, rather than waiting for a problem.
Different parts, different methods
Fans and fan sections
The fan moves all of the unit’s air, so dirt on it gets spread around. The impeller, its housing and the fan chamber are cleaned.
Drain trays
The drain tray collects water from the cooling coil. We clear standing water, clean out slime and check the outlet is draining.
What AHU cleaning looks like in Gravesend
The nearest hospital to Gravesend is Herts and Essex Hospital, about 4.6 miles south-east. Clean air matters most where people are unwell, and that’s as true in a care home as in a hospital. Gravesend, about 29 miles from central London, is within our usual area. Evening, overnight and weekend visits are all possible.
Herts and Essex Hospital, about 4.6 miles south-east, is the nearest hospital to Gravesend, and healthcare sites of every size need their supply air kept clean. If you manage a school such as Albury Church of England Voluntary Aided Primary School, ventilation cleaning is best booked for the holidays.
Gravesend is about 4 miles north-west of Bishop's Stortford, in Hertfordshire. For AHU cleaning in and around Gravesend, please ring 0345 646 2711 or send us an email for a fixed quote. We work across South East England and London, including Gravesend. Across Hertfordshire, we cover 381 places, Gravesend among them. Our Chelmsford page covers sites nearby (21 miles or so).
Our technicians cover all of the SG11 postcode area for AHU cleaning and the roads nearby. Nearby, we also carry out AHU cleaning in Albury (1 mile west), Clapgate (1 mile south-east), Furneux Pelham (2 miles north), Braughing (3 miles west) and Hay Street (3 miles west). We also work in nearby towns such as Stevenage (12 miles west), Bishop's Stortford (4 miles south-east), Welwyn Garden City (14 miles south-west), Hoddesdon (12 miles south-west), Cheshunt (15 miles south-west) and Hertford (11 miles south-west).
Landmarks near Gravesend
We work in commercial kitchens and buildings around The Catherine Wheel pub, among other places. The nearest railway station is Bishops Stortford station, about 4.2 miles south-east. A little further out are Herts and Essex Hospital (4.6 miles south-east) and Bishops Stortford Local History Museum (3.1 miles south-east).
What happens on the day
The first job on site is protection: sheeting goes over floors and surfaces close to the work. Then we make the system safe and start. It takes half a day to a full day per unit, with large plant planned over several shifts, and we clear up before we go. A quick note on how to find the site and where to park makes a visit to Gravesend run smoothly.
- We start with a survey of the unit and a fixed quote for the work.
- The unit is shut down with your site team and the area protected.
- We clean or change the filters as agreed, then clean the coils, fan and internal panels.
- We clean out the drain tray and make sure it drains.
- We close up the unit and send the certificate and before and after photos.
Preparing for the visit
- Let us know when the site is closed or quiet
- Name a contact who can let us in at the agreed time
- Find the previous report, if there is one
How to get a quote
For a fixed quote, call us on 0345 646 2711 or email us 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. We usually come back within one working day.
Advice
Gravesend: your questions answered
Will you come out to Gravesend?
Yes, smaller places are covered as well as towns. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Gravesend for AHU cleaning?
Yes. Our area runs across London and the South East, Gravesend included. Get in touch with the details and we will arrange a survey.
What is TR19?
It’s the industry benchmark for cleaning ventilation and kitchen extract systems, written by BESA. It sets out inspection, cleaning and record keeping and expects a risk-based approach.
How often should an air handling unit be cleaned?
It depends on the unit, the filters and how the building is used. Inspection tells you when cleaning is needed, and the report recommends a next date.
What happens to the waste?
Waste is contained during the work and removed when we leave, including grease, debris and dirty water. We do not leave it behind.
How do you keep the site clean during the work?
We start with protection: sheeting over floors, worktops and anything close to the work. The area is left tidy, with our waste taken away.
What should I send you?
A short description and a few pictures, with the address and opening hours. If we need more, we will ask.
Can you fix a faulty AHU?
We clean the unit and flag faults rather than repair them, with photos where it helps.
Managing agents and facilities teams in Gravesend
Records are where multi-site compliance often slips. Each visit ends with a dated report and pictures, so you can show an insurer or inspector what was done at each site.
We also work for facilities teams across offices, schools and healthcare across Hertfordshire. Work can be phased by floor, building or site to keep disruption down.
Leave it or put it right?
A light clean now is simpler than a heavy one later. Leave it for years and dirt bakes onto coils and casings, especially where there’s been moisture. If the system at a site near Gravesend fails, there may be nowhere nearby to move to.
What you pay reflects the actual work. That is why we survey first, from photos or on site, and why the quote is fixed before work begins.
Why choose Duct Doctor in Gravesend
- In business since 2009
- Survey first, then a fixed quote
- Accredited under CHAS and SafeContractor, with ISO 9001
- Fixed quotes from a survey or photos
See our cost guide or our accreditations.