Hertfordshire · Air handling unit cleaning
How Wood AHU cleaning
Our technicians work in How Wood on cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces. Fixed quotes, work around your opening hours and photo reports as standard.
- Air handling units never cleaned inside
- Drain trays holding standing water
- Fan sections that haven’t been cleaned in years
AHU cleaning in How Wood, done properly
Coils are where a lot of the dirt ends up. A coated coil restricts airflow and makes the unit work harder. Coils are cleaned carefully, with methods chosen so the fins aren’t flattened. The work covers filter sections, dampers and louvres and internal panels, and the jobs we see most are units needing a clean before a new tenant or handover and dust built up on fan impellers.
In a place like How Wood, air handling units are often tucked into roof spaces or small plant rooms, where they’re easy to forget. Every unit, large or small, has filters, coils and a drain tray to keep clean.
For insurers and inspectors, the record counts. That’s why every job is written up in a report with photos, and grease extract cleans come with a TR19® certificate issued through the BESCA Vent Hygiene Elite portal.
- Location
- How Wood (AL2)
- Region
- Hertfordshire
- Reporting
- Photo report after each visit
- Quote
- A fixed quote up front
- Working hours
- Evenings, overnight and weekends; 24/7 emergencies
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
What your team can do, and what needs us
Your own staff can handle the daily basics: wiping down canopy surfaces, cleaning filters and keeping a simple log. What they can’t safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
Good housekeeping makes our visits easier, not unnecessary. Clean filters and tidy surfaces slow the build-up, but the parts you can’t see still need a specialist at the right interval.
Nearby places to How Wood
More services for How Wood
How it works
Before we leave, we walk the area with whoever is on site. We point out anything that couldn’t be reached or needs a follow-up, and it goes on the report too. The visit takes a single shift for a typical unit, longer for large or heavily soiled ones. In a place like How Wood, we fit the visit around your hours.
- First we agree when the unit can be switched off, including evenings or weekends.
- We take before pictures 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 photos and issue the certificate and report.
Getting ready for the visit
- Let us know about parking and loading
- Have your last certificate or report to hand
- Make sure someone can let us in and lock up afterwards
How to get a quote
Quoting starts with a diagnosis, either from pictures and details you send or from a site visit. Then we send a fixed price, before we start.
Advice
Do you need AHU cleaning in How Wood?
Wherever there’s a cooling coil, there’s condensate. If the drain tray outlet blocks or the tray does not fall properly, water stands in it, and that’s where slime and odours start.
Look out for these warning signs:
- Dirty coils holding back the airflow
- Stale or musty smells from the ventilation
- Air handling units due a clean after building work
- Drain trays holding standing water
If you run a surgery, dental practice or care home near How Wood, clean ventilation matters as much to you as to a hospital like Napsbury Hospital (about 1.8 miles east).
What to look for in a quote
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
- Whether a survey comes first
- Exactly which parts of the system are covered
- Proof of insurance
FAQs for How Wood
Will you come out to How Wood?
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 How Wood outside opening hours?
Yes, evening, overnight and weekend work is normal for us. It means the site in How Wood keeps running as normal. Your opening times are the first thing we ask for.
How much notice should we give?
For planned work, earlier is better, especially if the next clean or test is due soon. For emergencies, we take calls 24/7.
Will you repair the fan or motor?
AHU cleaning is what we offer here, not mechanical repairs. If we spot a fault, we note it in the report for your maintenance team to follow up.
Which accreditations do you hold?
We’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we are fully insured.
Do you offer maintenance contracts?
Yes, of course. Send details of the systems and how they’re used, and we will suggest a schedule and quote for it.
What about areas you can’t get to?
They’re listed in the report, never skipped quietly. You will know exactly which parts weren’t reached and why, and we can quote to improve the access.
Do you clean the ductwork as well?
Yes. We reach the ducts through access panels, with anything inaccessible recorded, and new panels can be fitted.
What affects the quote in How Wood
We don’t publish a price list, because sites vary so much. The quote depends on:
- Working hours and out-of-hours timing
- The number of sites or systems
- What state the system is in
- One-off work versus a regular cycle
Whatever the type of site, the quote works 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.
Helping us quote
Photos let us diagnose from a distance. Try to include:
- Where the site is and what kind of site it is
- Any access panels or hatches you can see
- How we’d reach plant on a roof or in a plant room
- When the site is open and when it’s quiet
The quickest way to a quote is to send pictures: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Tell us what kind of site it is and when it’s open, and we can price many jobs without a visit.
Why it’s worth doing now in How Wood
If people in a building in How Wood complain about stuffy or smelly air, the AHU is worth looking at. A clean tackles the source instead of masking it. In a smaller place like How Wood, a site that has to close is felt quickly.
Several systems or sites on one quote can make for a more efficient booking. Tell us about everything you’d like looked at and we’ll price it together.
Why book with us
- A single point of contact for sites across the South East and London
- Evenings, overnight and weekends, plus 24/7 emergency callout
- Survey first, then a fixed quote
- Photo reports with every job
Take a look at what affects the cost and our accreditations and certificates.
Managing agents and facilities teams in How Wood
If you look after several sites, we can schedule visits across all of them on one quote. Each site gets its own report and pictures, so each one has its own record.
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.
Ventilation in How Wood buildings
Food Standards Agency records list about 10 hospitals, care homes and childcare premises registered as food businesses within 1.5 miles or so of the middle of How Wood. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. The nearest hospital to How Wood is Napsbury Hospital, about 1.8 miles east. If you run a surgery, clinic or care home, your ventilation deserves the same care as a hospital’s, on a smaller scale. At about 19 miles from central London, How Wood sits well inside the area we cover. The visit is fixed around your opening hours, not ours.
For workplaces around How Wood station with mechanical ventilation, cleaning can be done in the evening or at weekends. If you manage a school such as How Wood Primary and Nursery School, ventilation cleaning is best booked for the holidays.
How Wood is about 2 miles south-west of St Albans, in Hertfordshire. How Wood gets the same approach as every site we work on: diagnosis first, a fixed price, out-of-hours working where necessary and a written report with photos. How Wood is one of 381 places in Hertfordshire we cover for commercial clients. You can also see our page for London, roughly 19 miles from How Wood.
Every address in AL2 is covered for AHU cleaning, from the main roads to the quietest streets. You will find streets such as Ringway Road, Alder Close and How Wood, and we cover them all for AHU cleaning. Close by, we work in Park Street (1 mile north-east), Chiswell Green (1 mile north-west), Frogmore (1 mile east), Bricket Wood (1 mile south-west) and Colney Street (1 mile south-east). Within a short drive, we also cover Watford (4 miles south-west), Hemel Hempstead (5 miles north-west), Stevenage (15 miles north-east), Welwyn Garden City (9 miles north-east), Harpenden (7 miles north) and Hoddesdon (15 miles east).
Landmarks near How Wood
In How Wood, that means kitchens and buildings near Marlborough Science Academy and The Falcon pub. There’s a railway station in How Wood itself: How Wood station. Nearby you’ll also find Hilfield Castle (4.6 miles south) and Hypocaust Museum (2.1 miles north). Open spaces near How Wood include Broad Colney Lakes and Verulamium Lake.
When it’s something else
We won’t sell you work that does not address the problem, so here are the limits:
- Faulty motors, drives or bearings
- Problems with the unit’s controls or sensors
- Damaged coils beyond cleaning
If you are not sure, just phone us on 0345 646 2711 or email us and we’ll give you a straight answer before you book.
Parts of the system we cover
- Filter sections
- Dampers and louvres
- Internal panels
- Drain trays
- Heating and cooling coils
- Supply and extract fans