Hertfordshire · Air handling unit cleaning
AHU Cleaning in Sarratt
Our technicians work in Sarratt 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.
- Drain trays holding standing water
- Fan sections that haven’t been cleaned in years
- Filters that are clogged or overdue
Common problems we fix in Sarratt
Whatever surrounds a building in Sarratt, the air drawn into its AHU carries dust, pollen and debris. Most of it lands at the intake and the first stage of filters, and some travels further into the unit.
Signs it’s time to call us include:
- Coils clogged with dust and debris
- Plant that needs cleaning after a refit
- Units that have only ever had filter changes
- Rooms that smell stuffy when the system runs
If you run a surgery, dental practice or care home near Sarratt, clean ventilation matters as much to you as to a hospital like Leavesden Hospital (about 4 miles east).
Comparing quotes
- Whether they recommend a next date
- If they look at the system before pricing
- When they can work, and whether that is outside your opening hours
- What insurance they carry
AHU cleaning in Sarratt
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 photos, so the report shows exactly what was done. If you’re dealing with units needing a clean before a new tenant or handover and plant that has been serviced but not cleaned, we can put it right.
Work in a small place like Sarratt starts with agreeing access and timings, and the ventilation is inspected, cleaned and recorded the same as anywhere.
Think of the report as the system’s health record: a dated account with pictures of everything we did. For TR19® Grease cleans, the certificate comes through the BESCA Vent Hygiene Elite portal, ready for your insurer.
- Where
- Sarratt (WD3)
- Region
- Hertfordshire
- Reporting
- Report and photos after the visit
- Quote
- A fixed quote up front
- Working hours
- Out of hours as standard, 24/7 emergency line
- Telephone
- 0345 646 2711
- Reviewed
- 30 October 2026
What the work involves, part by part
Drain trays
The drain tray collects water from the cooling coil. We clear standing water, clean out slime and check the outlet is draining.
Rooftop and plant room units
Rooftop units take the weather, and intakes can collect leaves and debris. The intake section gets particular attention.
Staff cleaning versus specialist work
Staff cleaning and specialist work are not the same thing. Wiping filters daily and washing them weekly keeps the visible parts in order, but grease that has passed the filters is out of reach. That part needs specialist access and equipment.
Staff cleaning does not replace a specialist visit; it supports it. Clean filters and tidy surfaces slow the build-up, but hidden parts of the system still need specialist attention.
Sarratt questions
Will you come out to Sarratt?
Yes, Sarratt is part of our area, however small the site. Photos of the system and directions to the site help us plan the visit.
Do you clean school ventilation in Sarratt in the holidays?
Yes. Half-terms and the summer break are the natural time for school work. The FSA’s register shows about 3 schools and colleges with food registrations within roughly a mile and a half of Sarratt. Just call us on 0345 646 2711, or send details by email with your term dates and we’ll plan around them.
What should I send you?
A short description and a few pictures plus the address and your hours. If we need more, we will ask.
Which accreditations do you hold?
Duct Doctor is a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we’re fully insured.
What types of premises do you cover?
Commercial premises of every kind: from restaurants, pubs and hotels to schools, hospitals, care homes, offices, shops and food production sites. Work is timed around how each site runs.
What’s TR19?
TR19® is BESA’s specification for ventilation hygiene. Since 2019, TR19® Grease has been a standalone specification for grease in kitchen extract systems, while TR19® Air covers other supply and extract ductwork.
How much does AHU cleaning cost?
There’s no set price, as it depends on the job: how big it is, what state it’s in, how we reach it and the working hours. We fix the price before any work starts.
Do you clean the ductwork as well?
Yes. We reach the ducts through access panels, and any sections we can’t reach are noted in the report, and new panels can be fitted.
Managing agents and facilities teams in Sarratt
If you look after several sites, we can plan visits across the whole estate and price them together. Every building has its own written report, so records stay tidy.
Facilities teams in offices, schools and healthcare sites book us too in Sarratt and across Hertfordshire. Work can be phased by floor, building or site around the people who use them.
What affects the quote in Sarratt
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Working hours and out-of-hours timing
- The condition of the system
- Site rules, permits and inductions
- The size of the system
When the work has to happen, how we reach it and how big the site is all affect the cost. Each of those is built into the quote, and the price is fixed before work begins.
Asking for a quote
To speed up the quote, send us:
- How we’d reach plant on a roof or in a plant room
- A few general shots of the system
- When the site is open and when it’s quiet
- Any previous report or certificate
Quoting starts with a diagnosis, from your photos and details or, where that is not enough, a survey on site. After that, you get a fixed price for the work, before work begins.
What we do, step by step
Your staff do not need to do much on the day. Someone lets us in at the agreed time and shows us where everything is, and the rest is down to us. Before we leave, the area is tidied and the paperwork follows. Photos of the system and how to reach it help us plan a visit to Sarratt.
- The survey covers the unit, its access and how it can be shut down.
- The area is protected and the unit made safe.
- Each section is cleaned of dust, debris and slime.
- We clean the coils and clear the tray and drain.
- We close every panel, hand the unit back and send the report and certificate.
Getting ready for the visit
- Tell us the best time to work, such as after service or at a weekend
- Dig out any earlier paperwork for the system
- Mention any locked doors, roof access or ceiling voids
How to get a quote
The quickest way to a quote is to send pictures: the system from a couple of angles, plus any access panels or hatches. Add the site type and your opening hours, and we can price many jobs without a visit.
Advice
Towns and villages near Sarratt
What else we do in Sarratt
Sarratt buildings and their air
Food Standards Agency data includes about 3 schools, colleges and universities in and around Sarratt, up to about a mile and a half out. Buildings like these often rely on mechanical ventilation, which TR19® Air covers. Sarratt, 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. Leavesden Hospital is the nearest hospital, about 4 miles east of Sarratt. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients.
Classrooms and halls at schools such as Sarratt Church of England Primary School are easiest to work in when pupils are away.
Sarratt is about 3 miles north of Rickmansworth, in Hertfordshire. For AHU cleaning in and around Sarratt, it’s easy to get a fixed quote: please phone us on 0345 646 2711, or send details by email. We work across South East England and London, Sarratt included. Sarratt is one of 381 places in Hertfordshire where we work for commercial clients. London is in our area too, around 21 miles away.
AHU cleaning in WD3 follows the same survey, fixed quote and written report as everywhere else we cover. Local streets include Alexandra Road, Downer Drive and The Briars, all of which we cover for AHU cleaning. We also cover Micklefield Green (1 mile south-east), Bucks Hill (1 mile north-east), Chandler's Cross (2 miles south-east), Loudwater (2 miles south) and Chorleywood West (2 miles south). Within a short drive, we also cover Watford (4 miles east), Hemel Hempstead (5 miles north), St Albans (8 miles north-east), Welwyn Garden City (15 miles north-east), Harpenden (11 miles north-east) and Hatfield (12 miles north-east).
Local landmarks in Sarratt
We work in commercial kitchens and buildings around The Boot Public House and St Clement Danes School and the streets around them. For rail, the closest station is Chorleywood station, roughly 2.3 miles south-west. Nearby you’ll also find Chiltern Open Air Museum (3.8 miles south-west) and Leavesden Hospital (4 miles east). For a walk, there’s Sarratt Bottom nature reserve and Tumbling Bay.
Looking after it afterwards
Here’s the after-treatment advice, in brief:
- Make sure condensate is draining away
- Keep the certificate and photo report with the plant records
- Note any water around the unit or leaks below it
- Don’t ignore odours coming through the grilles
You receive a TR19® certificate and a photo report after the clean. Keep both with the building’s maintenance records.
Keep the area around the intake clear. What’s near the intake ends up in the unit.