West Sussex · Air handling unit cleaning
Mackerel's Common AHU cleaning
We cover Mackerel's Common for AHU cleaning. Fixed quotes, work around your opening hours and photo reports on every job.
- Stale or musty smells from the ventilation
- Blocked condensate drains and slimy trays
- Intake sections clogged with outdoor debris
AHU cleaning in Mackerel's Common, done properly
The fan pushes every bit of air in the system, so dirt on the impeller and housing gets spread around. We clean the fan section along with the rest of the unit, once the unit has been shut down and isolated. If you are dealing with air handling units with blocked filters and drain trays holding standing water, we can put it right, from heating and cooling coils, supply and extract fans and drain trays onwards.
In rural areas, ventilation units are often in roof voids or outbuildings, where filters and drain trays get forgotten.
Accreditations are easy to claim and worth checking. Ours are BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease, plus CHAS, SafeContractor and ISO 9001, with full insurance on top.
- Place
- Mackerel's Common (RH14)
- Region
- West Sussex
- Reporting
- Photo report after each visit
- Quotes
- A fixed price before any work starts
- Hours
- Overnight and weekend work, 24/7 emergency callout
- Call
- 0345 646 2711
- Updated
- 30 October 2026
Landlords, agents and facilities managers
Landlords, managing agents and facilities managers book us, not only the businesses that use the systems. Where a system serves more than one tenant, such as a shared riser, it helps to agree who arranges the work, and we can quote for the whole system.
Where a tenant occupies the premises but the landlord owns the building, the lease normally sets out who maintains what. We can quote either party, and the report can go to both.
How it works
Night work is normal for us. Evenings, nights and weekends are when much of our work happens, so a kitchen or building can carry on as usual the next day. The visit itself takes anything from half a day for one small unit to several shifts for a plant room full of them. Pictures of the system and its access let us plan the work in Mackerel's Common before we set off.
- First we agree when the unit can be switched off, including evenings or weekends.
- Before cleaning, each section is photographed.
- We work through the unit from the intake to the outlet.
- The fan and drain tray are cleaned and the drain checked.
- After pictures are taken and the certificate issued.
Before we arrive
- Dig out any earlier paperwork for the system
- Arrange a key holder or contact on site
- Clear the space around the work
How to get a quote
Here’s what helps us quote: where the site is, what it is and its opening hours, photos of the system and the last certificate or report, if there is one. Once you have those, ring 0345 646 2711 or email us.
Related advice
Signs you need AHU cleaning in Mackerel's Common
Filters catch most of the dust, but not all of it. The fine dust that passes the filters lands on the coils, the fan and the internal panels, a little more each month.
Any of these means the system needs a check-up:
- Odours coming through the supply air
- Plant that needs cleaning after a refit
- Dirty filters cutting the airflow
- Dust built up on fan impellers
Every job around Mackerel's Common ends with a record of what was cleaned and what was found.
What to look for in a quote
- Whether the quote is based on a survey or pictures
- What’s included in the scope, part by part
- What records you will receive afterwards
- What hours they’ll be on site
What affects the cost of AHU cleaning
We don’t publish a price list, because sites vary so much. The quote depends on:
- The condition of the system
- How easy every part is to reach
- The scale of the work
- How many systems or sites are involved
Leaving it longer rarely makes the work cheaper. Problems in a system tend to grow, which can make the next visit longer. If you’re not sure what’s needed, call 0345 646 2711, or send details by email for straight advice and a fixed quote.
What we need to know
A few details help us quote accurately. With your enquiry, please include:
- When the site is open and when it’s quiet
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- The paperwork from the last visit, if you have it
- Any access panels or hatches you can see
Want a quote for AHU cleaning? Please ring 0345 646 2711 or drop us a line with a few details about the site. We will talk you through the work and give you a fixed quote before anything is booked.
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. Cleaning inside ducts and units is specialist work.
When your team notices a problem between visits, such as dripping grease, a noisy fan, a smell or a filter that won’t come clean, they should report it rather than try to fix it. We’ll take a look and send you a fixed quote.
What a clean will not put right
In fairness, there are a few things this work will not fix:
- Coils that are corroded or leaking and need replacing
- Mechanical faults with motors, belts or bearings
- Building management system faults
Not sure which it is? You can ring 0345 646 2711, or send details by email and we will tell you honestly.
Where we work
- Drain trays
- Internal panels
- Heating and cooling coils
- Dampers and louvres
- Supply and extract fans
- Filter sections
Common questions in Mackerel's Common
Do you cover smaller places like Mackerel's Common?
Yes, smaller places are covered as well as towns. Photos of the system and directions to the site help us plan the visit.
Can you work in Mackerel's Common outside opening hours?
Yes, out-of-hours work is a big part of what we do. The work in Mackerel's Common can fit around your hours. Just give us a ring on 0345 646 2711 or send us an email with your opening times and we’ll plan around them.
How long does it take to clean an air handling unit?
Typically the clean takes one overnight shift for many single units, with bigger plant phased. The shutdown is planned to fit, including evenings or weekends.
Is there a survey before the work?
Yes. For many sites, photos and a few details are enough, and larger or hidden systems get a visit.
What information do you need?
Only a few details: the address, the site type, your opening hours and how we reach the system. Photos and the last report help too. Then ring 0345 646 2711, or send details by email.
Does the AHU have to be shut down for cleaning?
Yes. The fan must be stopped and the unit isolated, and we time the work to suit the site.
Are you accredited?
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.
Can you come out in an emergency?
Yes. Our emergency line runs 24/7, for problems that cannot wait. Ring any time and tell us what’s happened.
Places near Mackerel's Common
Other services in Mackerel's Common
Between visits
Once we have finished, these simple steps help:
- Stick to the filter change plan
- Do not ignore odours coming through the grilles
- Keep inspection doors on the unit in good order
- Check the drain tray is emptying during routine visits
We recommend when the unit should next be inspected or cleaned, taking into account how dirty it was. Under TR19® Air the timing is set by inspection and risk, not a fixed calendar.
Make the drain tray part of every maintenance visit. Catching a slow drain early stops standing water building up.
What AHU cleaning looks like in Mackerel's Common
About 37 miles out from central London, Mackerel's Common is part of the South East area we work across. Visits are booked around your hours, evenings and weekends included.
Around Mackerel's Common, as anywhere, ventilation cleaning begins with an inspection.
Mackerel's Common is about 10 miles west of Horsham, in West Sussex. Sites in Mackerel's Common get the same service as everywhere we cover: diagnosis first, a fixed price, out-of-hours working where needed and a written report with pictures. Our West Sussex coverage runs to 371 places, Mackerel's Common among them. We also work in Guildford, around 14 miles away.
Here we cover the RH14 postcode area for AHU cleaning. Neighbouring places we cover for AHU cleaning include Kirdford (1 mile south), Plaistow (2 miles north), Ifold (2 miles north), Balls Cross (2 miles south-west) and Wisborough Green (2 miles south-east). Further out, we also cover Horsham (10 miles east), Broadfield (15 miles east), Storrington (9 miles south-east), Billingshurst (5 miles east), Bewbush (15 miles east) and Angmering (15 miles south).
Near you in Mackerel's Common
The nearest railway station is Billingshurst station, about 4.8 miles south-east of the centre. For a walk, there’s The Mens and Shillinglee Lake.