West Sussex · Air handling unit cleaning
AHU Cleaning in Southwater
One call covers cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces in Southwater, from survey to sign-off. CHAS and SafeContractor accredited, ISO 9001 and fully insured.
- Dirty filters cutting the airflow
- Blocked condensate drains and slimy trays
- Stale or musty smells from the ventilation
AHU cleaning in Southwater, done properly
We clean the parts of the unit where dirt and moisture gather: filters, coils, drain trays, fans and the internal panels. Every clean comes with a TR19® certificate and before and after pictures in a report. If you’re dealing with air handling units with blocked filters and units needing a clean before a new tenant or handover, we can put it right.
For a building near Southwater, 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.
Duct Doctor has been trading since 2009, and we are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we’re fully insured.
- Place
- Southwater (RH13)
- Wider area
- West Sussex
- Records
- Written report with photos
- Price
- Fixed quote, normally within a working day
- Working hours
- Evenings, overnight and weekends; 24/7 emergencies
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
Aftercare tips
After the visit, a few habits help the work last:
- Keep the area around the fresh air intake clear
- Check the drain tray is emptying during routine visits
- File each AHU report in the maintenance log
- Plan the next inspection before the last report gets filed away
If the ductwork hasn’t been cleaned, consider it next. A clean unit feeding dirty ducts only solves half the problem, and we can survey both.
Make the drain tray part of every maintenance visit. A drain that’s cleared early never gets to the slime stage.
Also near Southwater
Other services in Southwater
Fixed quotes for AHU cleaning in Southwater
The diagnosis comes before the price. We look at:
- When the work can happen, such as evenings, overnight or weekends
- Site rules, permits and inductions
- How big the system is
- The condition of the system
What you pay reflects the actual work. That’s why we survey first, from pictures or on site, and the price is agreed before we start.
Helping us quote
There’s no need for technical detail. Just send:
- Photos showing the whole system and its surroundings
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Close-ups of filters, grilles, hatches or access panels
- Your last certificate, test record or report
Quotes are quick. Send a few details and pictures, and we usually reply with a fixed quote within one working day. If we need to see the system first, we book a survey around your hours.
Do you need AHU cleaning in Southwater?
Planned maintenance often covers belts, motors and filters but not cleaning. That means a unit can tick every service box and still be carrying years of dirt.
Clients usually contact us after spotting one of these:
- Air handling units due a clean after building work
- Coils clogged with dust and debris
- Drain trays holding standing water
- Filters that are clogged or overdue
Healthcare ventilation, from large hospitals like Horsham Hospital (about 3.2 miles north) to small clinics, depends on clean filters, coils and ducts.
What your quote should include
- Whether VAT is included
- What paperwork you get at the end
- How they set the interval to the next visit
- What’s included in the scope, part by part
How the visit works
We work around your opening hours, not the other way round. Most visits are booked for when the area is out of use, such as evenings, overnight, early mornings or weekends. Once we are in, the area is sheeted and anything that has to be off is turned off and cooled, and the work takes half a day to a full day per unit, with large plant planned over several shifts. For a site near Southwater, the work is booked around your opening hours, evenings and weekends included.
- 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.
- Drain trays are cleared and cleaned and the outlet checked.
- You get a TR19® certificate and a photo report.
Getting ready for the visit
- Find the previous report, if there is one
- Clear loose items from the work area
- Tell us the best time to work, such as after service or at a weekend
How to get a quote
Every quote begins with a look at the system, either from photos and details you send or from a site visit. Then we send a fixed price, before work begins.
Advice
Why it’s worth doing now in Southwater
A slimy drain tray only gets worse. Leave it and you risk overflows, leaks into the space below and odours carried round the building. Clearing it now is a much smaller job. Systems on quieter sites still build up dirt and wear, just more slowly.
Kitchens, offices, schools and hospitals are all priced the same way: how much there is, how we reach it, what state it’s in and when we can work. Ask for a fixed quote and we’ll go through it with you.
Why book with us
- Work around your opening hours, with 24/7 emergency cover
- Accredited under CHAS and SafeContractor, with ISO 9001
- A single point of contact for sites across the South East and London
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
Read what affects the cost or our accreditations.
Staff cleaning versus specialist work
Good housekeeping makes our visits easier, not unnecessary. Clean filters and tidy surfaces slow the build-up, but hidden parts of the system still need specialist attention.
Keep a record of what your team does. A simple log of filter washes, wipe-downs and checks helps show that the system is managed between specialist visits, alongside our reports.
Southwater buildings and their air
About 34 miles out from central London, Southwater is part of the South East area we work across. We work evenings, overnight and at weekends, so the visit fits around the site. Southwater’s nearest hospital, Horsham Hospital, is about 3.2 miles north. 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 Southwater Infant Academy, the holidays are the usual time to inspect and clean ventilation.
Southwater is about 3 miles south of Horsham, in West Sussex. Every kind of commercial site in Southwater, we can take on AHU cleaning. We can work out of hours so the site keeps running. Our West Sussex coverage runs to 371 places, and Southwater is one of them. Brighton is in our area too, around 16 miles away.
Every address in RH13 is within our area for AHU cleaning, from the main roads to the quietest streets. Whether your site is on Station Road, Walmer Close and Pevensey Road or a nearby road, we can help. If your site is just outside Southwater, we cover Tower Hill (2 miles north), Nuthurst (2 miles east), Brooks Green (2 miles west), Barns Green (2 miles west) and Maplehurst (2 miles south-east). Within a short drive, we also cover Crawley (9 miles north-east), Horsham (3 miles north), Worthing (14 miles south), Haywards Heath (11 miles east), Burgess Hill (11 miles south-east) and Shoreham-by-Sea (13 miles south).
Around Southwater
In Southwater, that means kitchens and buildings near The Lintot pub and The Doyle School of Design and Technology and the streets around them. Southwater’s nearest station is Christs Hospital station, roughly 1.9 miles north-west of the centre. A little further out are Christs Hospital School Museum (1.5 miles north-west) and Horsham Hospital (3.2 miles north). For a walk, there’s Knepp Wildland.
Southwater: your questions answered
Do you cover smaller places like Southwater?
Yes, Southwater is part of our area, however small the site. A survey first, from photos or a visit, means we arrive with the right kit.
Do you offer AHU cleaning in Southwater?
Yes. Our area runs across London and the South East, Southwater included. You can give us a ring on 0345 646 2711, or send details by email and let us know what needs doing.
Do you look at the system first?
Yes, always. We diagnose before we treat: the survey tells us what the system needs and how to reach it, and the quote is based on that.
How long does an AHU clean take?
Typically the clean takes anything from half a day for one small unit to several shifts for a plant room full of them. We plan the shutdown around that, including evenings or weekends.
How much notice should we give?
The more notice, the better, especially for out-of-hours work. Quotes normally come back within one working day, and there’s a 24/7 line for emergencies.
What should I send you?
Where the site is, what it is and when it’s open, along with a few photos and any previous report.
Do you have a 24/7 line?
Yes. If something urgent happens, like a fan failing or damage after a fire, call our 24/7 line, and we’ll advise on what to do next.
What about areas you can’t get to?
We record them on the report, with a note of where it is, and we explain what access is needed, such as extra access panels in ductwork.
Honest limits
To be straight with you, some problems need a different fix:
- Faulty motors, drives or bearings
- Dirty ducts beyond the unit itself
- Airflow problems caused by the system’s design
If you’re not sure, just call 0345 646 2711, or email photos and we will give you a straight answer before you book.
What the work covers
- Dampers and louvres
- Heating and cooling coils
- Supply and extract fans
- Drain trays
- Filter sections
- Internal panels