Hertfordshire · Air handling unit cleaning
AHU Cleaning in North Mymms
AHU cleaning for North Mymms, with a survey first and a report with photos at the end. Ask us for a fixed quote.
- Coils clogged with dust and debris
- Stale or musty smells from the ventilation
- Units that have only ever had filter changes
About our AHU cleaning in North Mymms
An AHU clean is a thorough examination and treatment of the unit. We look inside each section, clean what we find and record it with pictures, so the report shows exactly what was done. Common call-outs are for rooms that smell stuffy when the system runs and filters that are clogged or overdue, across filter sections, heating and cooling coils and supply and extract fans.
Somewhere as small as North Mymms, ducted ventilation is usually limited to a school, a care home, a surgery or a converted business building, wherever there is one, but those that do need it inspected and cleaned like any other.
Think of the report as the system’s health record: a dated account with photos of everything we did. Grease extract cleans are also certificated to TR19® Grease through the BESCA VHE portal, ready for your insurer.
- Place
- North Mymms (AL9)
- Wider area
- Hertfordshire
- Reporting
- Written report with pictures
- Quotes
- A fixed price before we start
- When we work
- Out of hours as standard, 24/7 emergency line
- Phone
- 0345 646 2711
- Updated
- 30 October 2026
What AHU cleaning looks like in North Mymms
Food Standards Agency records list about 3 schools, colleges and universities registered as food businesses in North Mymms and the streets around it, up to about 1.5 miles out. Where buildings like these have air handling units, filters, coils and drain trays need regular attention. About 16 miles out from central London, North Mymms is part of the South East area we work across. A survey and a fixed quote come first, then the visit at a time that suits you. North Mymms’s nearest hospital, Shenley Hospital, is about 3.5 miles south-west. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital.
Wherever a school like Brookmans Park Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time. If you manage shops or offices close to Brookmans Park station, a TR19® Air inspection shows whether the ductwork needs cleaning.
North Mymms is about 2 miles north-west of Potters Bar, in Hertfordshire. If you need AHU cleaning in North Mymms, please phone us on 0345 646 2711 or drop us a line for a fixed quote. We work across South East England and London, North Mymms included. Across Hertfordshire, we cover 381 places, and North Mymms is one of them. Our London page covers sites nearby (16 miles or so).
We work across the AL9 postcode area for AHU cleaning and the streets around it. Whether your site is on St Mary's Church Road, Abdale Lane and Warrengate Road or anywhere close by, our technicians can take on the work. If your site is just outside North Mymms, we cover Welham Green (1 mile north), Colney Heath (2 miles north-west), Sleapshyde (3 miles north-west), Hatfield (3 miles north) and Shenleybury (3 miles west). Within a short drive, we also cover Watford (9 miles south-west), Hemel Hempstead (11 miles west), Stevenage (13 miles north), St Albans (5 miles north-west), Welwyn Garden City (6 miles north) and Harpenden (9 miles north-west).
What’s near North Mymms
Typical jobs here are in premises near Chancellor's School, North Mimms Park and The Old Maypole Public House and the streets around them. For rail, the closest station is Brookmans Park station, about 0.7 miles east of the centre. Other landmarks nearby include Shenley Hospital (3.5 miles south-west) and Potters Bar Museum (2 miles south-east). Not far away are Furzefield Wood and Lower Halfpenny.
Also near North Mymms
What else we do in North Mymms
What affects the quote in North Mymms
You will get a fixed price before any work starts. It takes into account:
- One-off work versus a regular cycle
- Any permits to work or inductions
- Travel, parking and unloading
- The scale of the work
No two sites are the same, so we price each one individually. The size of the job, how we reach it, its condition and the working hours all play a part.
What we need to know
There’s no need for technical detail. It helps if you can send:
- Wide photos of the system and the area around it
- Close-ups of filters, grilles, hatches or access panels
- How we’d reach plant on a roof or in a plant room
- Where the site is and what kind of site it is
To help us quote: the address, the type of site and when it’s open, a few photos and any previous report or certificate. Once you have those, give us a ring on 0345 646 2711 or email us.
Between visits
Once we’ve finished, these simple steps help:
- Make sure the unit’s access doors open easily
- Report water on the plant room floor
- Diary the inspection date recommended in the report
- Change filters on schedule and log each change
The ducts served by the unit may need attention too. Cleaning the unit and ducts together gives the best result, and we can survey both.
Keep the area around the intake clear. Anything around the intake is likely to be drawn in.
How the visit works
When we arrive, we check the system against the survey or the photos you sent. If anything is different, we talk it through with the person on site before carrying on. After that, the work takes anything from half a day for one small unit to several shifts for a plant room full of them. A quick note on how to find the site and where to park makes a visit to North Mymms run smoothly.
- We agree a shutdown window that suits the building.
- We take before photos of each section of the unit.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- The fan and drain tray are cleaned and the drain checked.
- We take after pictures and issue the certificate and report.
Before we arrive
- Let us know about permits to work or site inductions
- Let us know how we reach the system, including roofs, risers and plant rooms
- Name a contact who can let us in at the agreed time
Getting a quote
Every quote begins with a look at the system, from your pictures and details or, where that isn’t enough, a survey on site. Then we send a fixed price, before we start.
Related advice
What we are called out for in North Mymms
Filters catch most of the dust, but not all of it. What gets through settles on coils, fans and the inside of the casing, a little more each month.
Clients typically contact us after spotting one of these:
- Rooms that smell stuffy when the system runs
- Dust built up on fan impellers
- Intake sections clogged with outdoor debris
- Dirty coils holding back the airflow
Healthcare buildings such as Shenley Hospital, about 3.5 miles south-west, depend on their ventilation; if you manage a surgery, clinic or care home near North Mymms, yours matters too.
What your quote should include
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
- What hours they’ll be on site
- If they look at the system before pricing
- How they set the interval to the next visit
In-house cleaning or a specialist?
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. What they can’t safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
Keep a record of what your team does. A dated log of in-house cleaning and checks shows an inspector that the system is looked after between visits, alongside our reports.
Common questions in North Mymms
Can you clean school ventilation in North Mymms during the holidays?
Yes, and it’s the easiest time to do it. There are about 3 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of North Mymms. Booking early in the term gives the best choice of holiday dates.
Is North Mymms within the area you cover?
Yes. Villages and rural sites across the South East are part of our work, North Mymms included. The journey is planned ahead, so a few details about the route help.
Do you do ventilation duct cleaning too?
Yes, supply and extract ducts, grilles and diffusers. The survey shows whether the ducts need cleaning now.
Is a quote from pictures possible?
Yes, where the photos show enough. If not, a site survey comes first, then a fixed quote.
What does TR19 mean?
BESA’s ventilation hygiene specification in two main parts: TR19® Grease for kitchen extract systems and TR19® Air for general ventilation. It is not legislation, but it’s the standard people check against.
Are you insured?
Yes. We are fully insured, and we can share the details when you need them.
What happens if you can’t reach some of it?
They’re marked on the report. Often the fix is extra access, such as new panels in ductwork, and we can fit those.
Is there a report after cleaning?
Yes. A TR19® certificate and photo report are sent after the clean, including anything we think needs attention.
How the job changes from site to site
Drain trays
The drain tray collects water from the cooling coil. Standing water and slime are removed and the outlet is checked.
Heating and cooling coils
Dirt on a coil slows the air and makes it harder for the coil to heat or cool. A clean gets air moving through the coil properly again.
What happens if it’s left?
Leave an AHU uncleaned and the dirt doesn’t stay put. It’s carried through the ductwork and out of the grilles, so cleaning the ducts without the unit only goes so far. If the system at a site near North Mymms fails, there may be nowhere nearby to move to.
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. Call for a fixed quote and we’ll explain each part.
Why North Mymms businesses choose us
- Full insurance on every job
- Out-of-hours work and a 24/7 emergency line
- CHAS, SafeContractor and ISO 9001
- Survey first, then a fixed quote
See what affects the cost and our accreditations and certificates.