Hertfordshire · Air handling unit cleaning
Colney Street AHU cleaning
Specialist AHU cleaning for Colney Street: a survey, a fixed price, careful work and proper paperwork. Call for a fixed quote.
- Air handling units due a clean after building work
- Filters that are clogged or overdue
- Leaves and litter drawn into the unit
How we handle AHU cleaning in Colney Street
Units vary a lot in size, age and layout, from a small ceiling-mounted unit to a large rooftop plant. Every job starts with a survey, from pictures or on site, followed by a fixed quote, so you know where you stand. The work covers filter sections, drain trays and dampers and louvres, and the jobs we see most are dirty fans and fan housings and plant that needs cleaning after a refit.
Somewhere as small as Colney Street, 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.
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.
- Where
- Colney Street (AL2, WD7)
- Wider area
- Hertfordshire
- Paperwork
- Photo report after each visit
- Quote
- A fixed price before work begins
- Hours
- Evenings, overnight and weekends; 24/7 emergencies
- Telephone
- 0345 646 2711
- Updated
- 30 October 2026
How we price AHU cleaning
Before we fix a price, we need to know a few things. We check:
- The size of the system
- Working hours and out-of-hours timing
- What state the system is in
- Site requirements such as sign-in and permits
One small site or a whole estate, we price it on the same basis: the work involved, the access and the timing. The price is fixed before any work starts.
Helping us quote
The more you tell us, the more accurate the quote. With your enquiry, please include:
- Problems your staff have spotted
- The roof, plant room or outside wall the system runs to
- Your opening hours and when the area is out of use
- The postcode and the type of business
Here’s what helps 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, call 0345 646 2711, or email photos.
Common problems we fix in Colney Street
It matters for two reasons: air quality, since the unit feeds occupied rooms, and performance, since dirt makes it strain. For the people using the building every day, that is the air they breathe for hours on end.
Clients typically contact us when they notice one of these:
- Plant that has been serviced but not cleaned
- Dirty fans and fan housings
- Air handling units with blocked filters
- Debris and leaves in the fresh air intake
Classrooms and halls at schools such as Park Street Church of England Voluntary Aided Primary School are easiest to work in when pupils are away.
Questions to ask before you book
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
- Whether the work can be done while the site is closed
- What happens if part of the system can’t be accessed
- How they set the interval to the next visit
What a clean will not put right
We won’t sell you work that does not address the problem, so these are the things it will not cover:
- Coils that are corroded or leaking and need replacing
- Ventilation that was badly designed in the first place
- Faulty motors, drives or bearings
Not sure which it is? You can ring 0345 646 2711 or send us an email and we’ll tell you honestly before you book.
Where we work
- Drain trays
- Supply and extract fans
- Filter sections
- Dampers and louvres
- Heating and cooling coils
- Internal panels
Colney Street: your questions answered
Do you clean school ventilation in Colney Street in the holidays?
Yes. Half-terms and the summer break are the natural time for school work. The FSA’s register shows about 5 schools and colleges with food registrations within roughly a mile and a half of Colney Street. Tell us your holiday dates and we will book the visit for when the site is empty.
Will you come out to Colney Street?
Yes, smaller places are covered as well as towns. A survey first, from photos or a visit, means we arrive with the right kit.
How do you protect the area?
Protection goes down first: sheeting over floors, worktops and anything close to the work. The area is left tidy, with our waste taken away.
Do you have insurance?
Yes, fully. We also hold CHAS and SafeContractor, for sites that check contractor safety.
Can you set up regular visits?
Yes. Scheduled maintenance plans are part of what we do, set at the interval the system needs. Each report recommends when the next visit should be.
Do you have a 24/7 line?
Yes, 24/7. Our office is open from 8am to 6pm on weekdays, and the emergency line covers the rest.
How much notice should we give?
The more notice, the better, especially for out-of-hours work. Quotes normally come back within one working day, and there’s a 24/7 line for emergencies.
Do you clean the ductwork as well?
Yes. We clean supply and extract ductwork to TR19® Air as well. Cleaning the unit and ducts together often makes sense, and we can survey both on the same visit.
What AHU cleaning looks like in Colney Street
There are about 5 schools, colleges and universities and about 4 care, childcare and hospital premises on the FSA’s food hygiene register in Colney Street and the streets around it, up to about 1.5 miles out. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. Colney Street’s nearest hospital, Kingsley Green, is about 1 mile east. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients. Colney Street, about 18 miles from central London, is within our usual area. A survey and a fixed quote come first, then the visit at a time that suits you.
Healthcare buildings such as Kingsley Green, about 1 mile east, depend on their ventilation; if you manage a surgery, clinic or care home near Colney Street, yours matters too.
Colney Street is about 3 miles south of St Albans, in Hertfordshire. If you need AHU cleaning in Colney Street, please give us a ring on 0345 646 2711, or email photos for a fixed quote. Our area covers London and the South East, Colney Street included. Across Hertfordshire, we cover 381 places, Colney Street among them. There’s also a page for London, about 18 miles away.
AHU cleaning in AL2 and WD7 is surveyed, quoted and booked the same way as anywhere else. Local streets include Old Parkbury Lane, Ventura Park and Radlett Road, all of which we cover for AHU cleaning. If your site is just outside Colney Street, we cover Frogmore (1 mile north-west), Park Street (1 mile north-west), How Wood (1 mile north-west), Bricket Wood (2 miles west) and Chiswell Green (2 miles north-west). Larger places within reach include Watford (4 miles south-west), Hemel Hempstead (6 miles north-west), Stevenage (15 miles north-east), St Albans (3 miles north), Welwyn Garden City (8 miles north-east) and Harpenden (8 miles north).
Around Colney Street
Around Colney Street, our work takes us to kitchens and buildings near The George and Dragon Public House and Samuel Ryder Academy and the streets around them. The nearest railway station is How Wood station, about 1 mile north-west. Well-known places in the area include Kingsley Green (1 mile east) and The Maltings (2.9 miles north). Green spaces nearby include Verulamium Lake and Broad Colney Lakes.
The process
On the day, we arrive at the time agreed with you, often in the evening, overnight or at the weekend so the site keeps working. Equipment that has to be off is switched off and allowed to cool first, and the area around the work is covered and protected. The work itself takes one overnight shift for many single units, with bigger plant phased. Seeing the system in pictures first means the trip to Colney Street 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.
- The fan and drain tray are cleaned and the drain checked.
- After pictures are taken and the certificate issued.
Getting ready for the visit
- Find the previous report, if there is one
- Clear loose items from the work area
- Tell us where we can park and unload
Getting a quote
Some systems can be priced from pictures; others need a survey. Big or complicated sites, and systems that are hard to see in photos, get a survey first. Either way, you get a fixed price before any work starts.
Related advice
Leave it or put it right?
Dirt left in an air handling unit does not stay in the unit. It moves on into the ductwork and out into the rooms, so cleaning the ducts without the unit only goes so far. Planning a trip to Colney Street ahead is easier for everyone than a rushed one.
Combining work into one visit or one programme often makes better use of the time. Tell us about everything you’d like looked at and we’ll price it together.
Why us?
- Fully insured
- Photo reports with every job
- Survey first, then a fixed quote
- One number for every site across the South East and London
Read our cost guide or our accreditations.
Between visits
Simple habits between visits make a real difference. We recommend:
- Change filters on schedule and log each change
- Keep inspection doors on the unit in good order
- Store the TR19 paperwork where auditors can find it
- Watch for drips or damp patches near the plant
The report suggests a date for the next inspection or clean, based on what we found. Under TR19® Air the timing is set by inspection and risk, not a fixed calendar.
Have the unit inspected regularly, in line with the risk-based approach of TR19® Air instead of leaving it to guesswork.
Places near Colney Street
What else we do in Colney Street
Part by part
Fans and fan sections
The fan section is cleaned with the unit switched off and isolated in agreement with the site.
Rooftop and plant room units
Units outside are exposed to weather and windblown debris. The intake section gets particular attention.