Hertfordshire · Air handling unit cleaning
Marshalswick AHU cleaning
AHU cleaning across Marshalswick and nearby, booked around your opening hours and finished with a written report and pictures.
- Plant that needs cleaning after a refit
- Dirty filters cutting the airflow
- Blocked condensate drains and slimy trays
Staff cleaning versus specialist work
A few tasks are always specialist work: entering ducts, working on fans, testing dampers and taking grease readings need training, the right equipment and safe access. That is our job.
Staff cleaning and specialist work are not the same thing. Wiping filters daily and washing them weekly keeps the visible parts in order, but they do not reach the grease that builds up further in. Reaching it takes a specialist with the right equipment.
AHU cleaning for kitchens and businesses in Marshalswick
All the building’s air passes through the fan, so dust on its blades and housing ends up in the airstream. Fan, housing and the surrounding panels are cleaned as part of the job, with the unit switched off and made safe first. If you have dirty filters cutting the airflow and dust built up on fan impellers, we can put it right, from heating and cooling coils, drain trays and filter sections onwards.
In a smaller place like Marshalswick, buildings with ducted ventilation are more likely to be a school, a surgery, a care home or a small business unit than an office block. Smaller systems still gather dust and need inspecting.
The report is your system’s health record: dated, with photos, and showing what was done. For TR19® Grease cleans, the certificate comes through the BESCA Vent Hygiene Elite portal, ready for your insurer.
- Place
- Marshalswick (AL4, AL1, AL3)
- Wider area
- Hertfordshire
- Records
- Report and pictures after the visit
- Quotes
- Fixed quote, normally within a working day
- When we work
- Out of hours as standard, 24/7 emergency line
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
Your questions about AHU cleaning in Marshalswick
Do you clean school ventilation in Marshalswick in the holidays?
Yes. The holidays are the usual time for school work. Food Standards Agency records list about 18 schools, colleges and universities with registered kitchens within about a mile and a half of Marshalswick. Send us your term dates when you give us a ring on 0345 646 2711, or email photos, and we’ll fit the work in.
Do you work at weekends in Marshalswick?
Yes, nights and weekends are routine for us. The site is handed back ready to open. Your opening times are the first thing we ask for.
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, any time. For anything urgent, such as a fan failure or damage after a fire, ring the 24/7 line, and we will advise on what to do next.
Do you survey before quoting?
Yes. We always survey first, from your pictures and details, or with a visit where necessary. Then you get a fixed quote.
What does AHU cleaning cost?
Every site is different, so each gets its own fixed quote. For a quote, call 0345 646 2711 or email us and tell us about the site and its opening hours.
Which accreditations do you hold?
BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease, plus CHAS, SafeContractor and ISO 9001. We’re fully insured and have been trading since 2009.
What does TR19 mean?
A BESA 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.
Honest limits
Not every problem is solved by AHU cleaning, and we will tell you before we start. It will not put right:
- Mechanical faults with motors, belts or bearings
- The supply and extract ducts, quoted separately
- Ventilation that was badly designed in the first place
If in doubt, call us on 0345 646 2711 or send us an email and we will say what we think.
What the work covers
- Dampers and louvres
- Supply and extract fans
- Heating and cooling coils
- Filter sections
- Drain trays
- Internal panels
Ventilation in Marshalswick buildings
There are about 18 schools, colleges and universities and about 30 caring premises (care homes, nurseries and hospitals) on the FSA’s food hygiene register in Marshalswick and the streets around it, up to about 1.5 miles out. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. The nearest hospital to Marshalswick is Hill End Hospital, about 1.1 miles south. Healthcare buildings depend on clean supply and extract ventilation, and the same applies to surgeries, clinics and care homes. Marshalswick, about 21 miles from central London, is within our usual area. We work evenings, overnight and at weekends, so the visit fits around the site.
If you manage a school such as St John Fisher Roman Catholic Primary School, ventilation cleaning is best booked for the holidays.
Marshalswick is about 1 mile north-east of St Albans, in Hertfordshire. Marshalswick gets the same approach as every site we work on: diagnosis first, a fixed price, out-of-hours working where needed and a written report with photos. Marshalswick is one of 381 towns, villages and districts in Hertfordshire where we work for commercial clients. Our London page covers sites nearby, about 21 miles away.
We cover every part of AL4, AL1 and AL3 for AHU cleaning and the streets around it. AHU cleaning is available to premises on Milvus Road, Jersey Lane and Sandpit Lane and nearby roads. We also cover the places around Marshalswick: Sandridge (1 mile north), Bernards Heath (1 mile west), St Albans (1 mile south-west), Childwick Green (2 miles north-west) and Sopwell (2 miles south-west). Within a short drive, we also cover Watford (8 miles south-west), Hemel Hempstead (7 miles west), Stevenage (11 miles north-east), Welwyn Garden City (5 miles north-east), Harpenden (4 miles north-west) and Hitchin (13 miles north).
Near you in Marshalswick
We work in commercial kitchens and buildings around The Baton pub, Sandringham School and Clarence Park, among other places. The nearest railway station is St Albans station, about 1.3 miles south-west of the centre. Nearby you’ll also find St Albans Musical Museum (0.8 miles south-west) and The Maltings (1.6 miles south-west). Not far away are The Wick Local Nature Reserve and Verulamium Lake.
Looking after it afterwards
Results last longer with the right care. We suggest:
- Keep inspection doors on the unit in good order
- Keep filter changes on time and recorded
- Note any water around the unit or leaks below it
- File each AHU report in the maintenance log
Once the clean is done, we send a TR19® certificate and a report with before and after photos. They belong in the plant or maintenance log.
Do not let leaves, litter or stored materials build up near the fresh air intake. What’s near the intake ends up in the unit.
Signs you need AHU cleaning in Marshalswick
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.
Look out for these warning signs:
- Dirty coils holding back the airflow
- Drain trays holding standing water
- Dirty fans and fan housings
- Intake sections clogged with outdoor debris
Healthcare buildings such as Hill End Hospital, about 1.1 miles south, depend on their ventilation; if you manage a surgery, clinic or care home near Marshalswick, yours matters too.
Before booking anyone
- Whether the quote is based on a survey or pictures
- Whether they recommend a next date
- Proof of insurance
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
How the visit works
There are three stages on the day: getting the area ready, doing the work and signing it off. Set-up means sheeting and making equipment safe, and the sign-off is a written report with photos. The middle part takes longest, which takes one overnight shift for many single units, with bigger plant phased. We plan the journey to Marshalswick and bring what the job is likely to need.
- First the unit is surveyed, from photos or a visit, and the scope agreed.
- We arrange the shutdown with your staff and sheet the area.
- 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.
How to prepare
- Let us know when the site is closed or quiet
- Tell us where we can park and unload
- Arrange a key holder or contact on site
Get a fixed quote
Every quote begins with a look at the system, either from photos and details you send or from a site visit. After that, you get a fixed price for the work, before we start.
Advice
Landlords, agents and facilities managers
If you look after several sites, we can schedule visits across all of them on one quote. Every building has its own written report, so records stay tidy.
Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must assess and reduce fire risk, and that can be the employer, the owner, a landlord, a facilities manager or a managing agent. Where responsibility is shared, records matter even more.
Towns and villages near Marshalswick
More services for Marshalswick
What affects the cost of AHU cleaning
Before we fix a price, we need to know a few things. We check:
- Access, including roofs, risers and ceiling voids
- How many systems or sites are involved
- The scale of the work
- The condition of the system
Every site is different, so each one gets its own fixed quote. Size, access, the condition of the system and when we can work all make a difference.
Asking for a quote
A few details help us quote accurately. When you get in touch, it helps to send:
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Photos showing the whole system and its surroundings
- The postcode and the type of business
- Your opening hours and when the area is out of use
Getting a quote does not take long. Send a few details and photos, and we normally reply with a fixed quote within one working day. If we need to see the system first, we book a survey around your hours.