Oxfordshire · Air handling unit cleaning
Caldecott AHU cleaning
Cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces for commercial sites in Caldecott and across Oxfordshire. BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease.
- Intake sections clogged with outdoor debris
- Rooms that smell stuffy when the system runs
- Air handling units due a clean after building work
How we handle AHU cleaning in Caldecott
We clean the parts of the unit where dirt and moisture gather: filters, coils, drain trays, fans and the internal panels. Every clean comes with a TR19® certificate and before and after pictures in a report. Common call-outs are for plant that has been serviced but not cleaned and units needing a clean before a new tenant or handover, across filter sections, drain trays and supply and extract fans.
Smaller buildings around Caldecott often keep their ventilation units in a roof void or plant cupboard, where they’re easy to forget. Every unit, large or small, has filters, coils and a drain tray to keep clean.
Think of the report as the 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 and sits alongside the report.
- Place
- Caldecott (OX14, OX13)
- Wider area
- Oxfordshire
- Records
- Written report with photos
- Price
- Fixed quote, normally within a working day
- When we work
- Out of hours as standard, 24/7 emergency line
- Call
- 0345 646 2711
- Page updated
- 30 October 2026
Caldecott: your questions answered
Is Caldecott within the area you cover?
Yes, Caldecott is part of our area, however small the site. A survey first, from pictures or a visit, means we arrive with the right kit.
Can you clean school ventilation in Caldecott during the holidays?
Yes. The holidays are the usual time for school work. There are about 5 schools, colleges and universities on the FSA’s food hygiene register within about 1.5 miles of Caldecott. Tell us your holiday dates and we’ll book the visit for when the site is empty.
What if parts of the system cannot be reached?
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.
How much notice should we give?
Earlier is better, especially for out-of-hours work. We normally quote within one working day, and emergencies are covered by our 24/7 line.
How long does it take to clean an air handling unit?
The work takes half a day to a full day per unit, with large plant planned over several shifts. Large plant can be split over several shifts, and you can call us on 0345 646 2711 or email us to plan it.
Do you have insurance?
Yes. We carry full insurance, and we’ve been trading since 2009.
What do you clean inside the unit?
Everything inside the unit that air passes over, from the intake and filters through the coils and fan to the outlet. The photo report shows each section before and after.
What accreditations do you have?
Duct Doctor is a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we carry full insurance.
Different parts, different methods
Heating and cooling coils
Dirt on a coil slows the air and makes it harder for the coil to heat or cool. Cleaning restores the open path through the fins.
Drain trays
Drain trays can rust and leak over time. Their condition goes into the report with pictures so repairs can be planned.
What happens on the day
Every visit runs to the same pattern: sheeting and protection first, make the system safe, do the work, tidy up and hand over the paperwork. On site, the work takes one overnight shift for many single units, with bigger plant phased. For a site near Caldecott, the work is booked around your opening hours, evenings and weekends included.
- We survey the unit from pictures or on site and agree what’s included.
- The unit is shut down with your site team and the area protected.
- Filters, coils, fan section and casing are cleaned in turn.
- Standing water and slime come out of the tray and the drain is checked.
- You get a TR19® certificate and a photo report.
Preparing for the visit
- 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
- Have your last certificate or report to hand
Ask for a quote
We don’t publish a price list, because every site is different. We look at your system first, from photos or on a visit, then send a fixed quote. To start, call us on 0345 646 2711 or use the quote form.
Related advice
Towns and villages near Caldecott
What else we do in Caldecott
Multi-site and managed buildings
Records are where multi-site compliance often slips. Every visit ends with a dated report and pictures, so you can show an insurer or inspector what was done at each site.
Running several sites is easier with one contractor. We work across London and the South East, so a run of sites can go into one programme and kept on a regular cycle.
Signs you need AHU cleaning in Caldecott
Cooling coils create condensation, and that water has to go somewhere. A blocked outlet or a badly sloped tray leaves standing water, and slime and smells soon follow.
Most sites get in touch after spotting one of these:
- Rooms that smell stuffy when the system runs
- Air handling units with blocked filters
- Dirty coils holding back the airflow
- Intake sections clogged with outdoor debris
School buildings such as Thameside Primary School are typically done in the holidays, so classrooms aren’t disturbed.
Comparing quotes
- Whether the figure could change on the day
- Whether the whole system is included, or only the parts that are easy to reach
- Whether inaccessible sections are listed on the report
- What insurance they carry
Honest limits
A few issues sit outside what this work can do:
- Building management system faults
- Mechanical faults with motors, belts or bearings
- A system that’s undersized for the building
If in doubt, call 0345 646 2711 or use the quote form and we will say what we think.
What the work covers
- Heating and cooling coils
- Drain trays
- Dampers and louvres
- Filter sections
- Internal panels
- Supply and extract fans
Looking after it afterwards
Looking after the system between visits is straightforward, and it helps at the next visit:
- Check the drain tray is emptying during routine visits
- Book the next check in line with the report
- Clear leaves and litter away from the intake
- Keep inspection doors on the unit in good order
Keep filter changes on schedule between cleans, as that does more than anything to keep the unit clean. Log every change so it’s easy to see when the next is due.
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.
Leave it or put it right?
A slimy drain tray only gets worse. Leave it and you risk overflows, leaks into the space below and odours carried round the building. Dealing with it early keeps the clean straightforward. It’s easy to lose track of when the work was last done on a quieter site.
Working hours, access and the scale of the site can all change the price. Each of those is built into the quote, and the price is fixed before any work starts.
What you get with us
- Trading since 2009
- CHAS, SafeContractor and ISO 9001
- Photo reports with every job
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
See what affects the cost and our accreditations and certificates.
Caldecott buildings and their air
Food Standards Agency records list about 5 schools, colleges and universities and about 9 care, childcare and hospital premises registered as food businesses in and around Caldecott, up to about a mile and a half out. Busy, occupied buildings like these are where clean supply air matters most. About 0.8 miles north-west of Caldecott is Abingdon Community Hospital, the nearest hospital. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital. Caldecott, about 53 miles from central London, is within our usual area. Visits are booked around your hours, evenings and weekends included.
If you run a surgery, dental practice or care home near Caldecott, clean ventilation matters as much to you as to a hospital like Abingdon Community Hospital (about 0.8 miles north-west).
Caldecott is about 1 mile south of Abingdon-on-Thames, in Oxfordshire. We provide AHU cleaning for commercial premises of every kind in Caldecott and the rest of Oxfordshire. We cover 443 places across Oxfordshire, large and small. You can also see our page for Oxford, about 7 miles away.
Postcode districts we cover here for AHU cleaning: OX14 and OX13. Local streets include Mill Road, Baker Road and Saxton Road, all of which we cover for AHU cleaning. Other places close to Caldecott include Culham (1 mile east), Abingdon-on-Thames (1 mile north), Sutton Courtenay (1 mile south), Milton (2 miles south) and Appleford-on-Thames (3 miles south-east). Larger places within reach include Oxford (7 miles north), Didcot (4 miles south-east), Witney (12 miles north-west), Carterton (15 miles north-west), Thame (15 miles north-east) and Wantage (7 miles south-west).
Around Caldecott
Around Caldecott, our work takes us to kitchens and buildings near Albert Park, The Old Anchor Inn and John Mason School. The closest station to Caldecott is Culham station, roughly 2.3 miles east of the centre. Nearby you’ll also find Pendon Museum (3.4 miles south-east) and FitzHarris Castle (1 mile north). Not far away are Dry Sandford Pit.