Hertfordshire · Air handling unit cleaning
Cottered AHU cleaning
AHU cleaning for Cottered and the surrounding area: a survey, a fixed price, careful work and proper paperwork. Ask us for a fixed quote.
- Dirty fans and fan housings
- Dirty filters cutting the airflow
- Stale or musty smells from the ventilation
AHU cleaning for kitchens and businesses in Cottered
Think of an AHU clean as a full check-up for the ventilation. We look inside each section, clean what we find and record it with pictures, so the report shows exactly what was done. The work covers heating and cooling coils, dampers and louvres and drain trays, and the jobs we see most are air handling units due a clean after building work and stale or musty smells from the ventilation.
In rural areas, ventilation units are often in roof voids or outbuildings, where filters and drain trays get forgotten.
We’re CHAS and SafeContractor accredited, we hold ISO 9001 and we are fully insured. On top of that, we’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we’ve been trading since 2009.
- Where
- Cottered (SG9)
- Region
- Hertfordshire
- Records
- Written report with photos
- Price
- A fixed price before any work starts
- Hours
- After hours by arrangement; emergencies any time
- Telephone
- 0345 646 2711
- Checked
- 30 October 2026
Keeping the system healthy
Aftercare is simple, and it makes the next visit easier:
- Make sure the unit’s access doors open easily
- Clear leaves and litter away from the intake
- Plan the next inspection before the last report gets filed away
- Make sure condensate is draining away
Keep filter changes on schedule between cleans, as that does more than anything to keep the unit clean. Record each change in the maintenance log.
Check drain trays and condensate drains during routine maintenance. A drain that’s cleared early never gets to the slime stage.
Part by part
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 clean the filter housing.
Fans and fan sections
The fan section is cleaned with the unit switched off and isolated with your site team.
What else we do in Cottered
When it’s something else
It’s worth knowing the limits before booking:
- Problems with the unit’s controls or sensors
- The supply and extract ducts, quoted separately
- A system that’s undersized for the building
If in doubt, give us a ring on 0345 646 2711, or send details by email and we will say what we think.
What we work on in Cottered
- Dampers and louvres
- Heating and cooling coils
- Supply and extract fans
- Internal panels
- Filter sections
- Drain trays
What affects the quote in Cottered
The price is fixed before any work begins. It takes into account:
- The condition of the system
- When the work can happen, such as evenings, overnight or weekends
- The scale of the work
- Where the site is and how we reach it
A single site or a whole portfolio, the quote is built the same way: what needs doing, how we get to it and when. You’ll have a fixed price before we start.
What we need to know
We can often survey from pictures. The most useful are:
- The site address and the type of premises
- When the site is open and when it’s quiet
- How we’d reach plant on a roof or in a plant room
- Any symptoms, from odd noises to smells or leaks
Every quote begins with a look at the system, either from pictures and details you send or from a site visit. Then we send a fixed price so you know the cost before any work starts.
What we’re called out for in Cottered
Mechanical servicing keeps a unit running, but it does not always include cleaning the inside. That means a unit can tick every service box and still be carrying years of dirt.
It’s time to book a visit if you see:
- Dust built up on fan impellers
- Condensate trays that won’t empty
- Intake sections clogged with outdoor debris
- Plant that needs cleaning after a refit
For schools like Freman College, the holidays are the usual time to inspect and clean ventilation.
What to look for in a quote
- Whether inaccessible sections are listed on the report
- Whether VAT is included
- Whether they recommend a next date
- Whether a survey comes first
What AHU cleaning looks like in Cottered
About 31 miles out from central London, Cottered is part of the South East area we work across. The visit is fixed around your opening hours, not ours.
An inspection comes first for any ventilation job around Cottered, so the cleaning matches what’s there.
Cottered is about 5 miles north-east of Stevenage, in Hertfordshire. Anywhere in SG9, we can take on AHU cleaning. Cottered is one of 381 places in Hertfordshire where we work for AHU cleaning. You can also see our page for Chelmsford, roughly 28 miles from Cottered.
We cover every part of the SG9 postcode area for AHU cleaning and the roads nearby. Local streets include Peasecroft, The Crescent and Warren Lane, all of which we cover for AHU cleaning. Other places close to Cottered include Throcking (1 mile north-east), Rushden (2 miles north-west), Chipping (2 miles north-east), Buntingford (2 miles east) and Aspenden (2 miles east). Within a short drive, we also cover Stevenage (5 miles south-west), Bishop's Stortford (11 miles south-east), Welwyn Garden City (11 miles south-west), Harpenden (15 miles south-west), Hitchin (8 miles west) and Hoddesdon (13 miles south).
Local landmarks in Cottered
We work in commercial kitchens and buildings around The Bull Public House, among other places. Nearby you’ll also find Clothall Castle (3.5 miles north-west). Green spaces nearby include Hawkins Wood.
What staff can safely do
A few tasks are always specialist work: opening up ductwork, cleaning fans, drop testing fire dampers and measuring grease call for the right kit, training and safe access. Leave those to us.
When your team notices a problem between visits, like drips, unusual noise, smells or damaged filters, they should report it rather than try to fix it. We can diagnose it and quote.
Cottered questions
Do you offer AHU cleaning in Cottered?
Yes. We work across London and the South East, and Cottered is part of that. To start, give us a ring on 0345 646 2711 or use the quote form with a few pictures of the system.
Is Cottered within the area you cover?
Yes. Villages and rural sites across the South East are part of our work, Cottered included. Let us know about access, parking and anything unusual about getting there when you book.
How do you keep the site clean during the work?
Protection goes down first: sheeting over floors, worktops and anything close to the work. We tidy up and take our waste away before we leave.
Can you set up regular visits?
Yes. Scheduled maintenance plans are part of what we do, set at the interval the system needs. The report from each visit recommends the next date.
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.
What does AHU cleaning cost?
Every site is different, so each gets its own fixed quote. For a quote, call 0345 646 2711 or send us an email with the site type, opening hours and a few pictures.
What do you clean inside the unit?
The main parts are the filters, coils, drain tray, fan and inside of the casing. We confirm the scope after looking at the unit.
Can you price the work without visiting?
Usually, yes. Send a few wide photos plus close-ups of panels, filters or grilles, and a fixed quote usually follows within one working day. Some sites still need a visit, and we will say so.
What we do, step by step
We are used to working while the site is closed. A lot of visits happen overnight or at weekends, so the site can open as normal afterwards. On site, the work takes half a day to a full day per unit, with large plant planned over several shifts. Seeing the system in pictures first means the trip to Cottered can be planned properly.
- First we agree when the unit can be switched off, including evenings or weekends.
- Before cleaning, each section is photographed.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- We finish with the fan section and the drain tray.
- We take after pictures and issue the certificate and report.
How to prepare
- Make sure someone can let us in and lock up afterwards
- Allow time for equipment near the work to be turned off and cool down
- Mention any locked doors, roof access or ceiling voids
How to get a quote
There’s no standard price list, because no two systems are the same. Instead, we look at your site first, from photos or a survey, then send a fixed quote. To get going, call 0345 646 2711 or drop us a line.