Commercial Ductwork Cleaning & Ventilation Hygiene
Deduct Ltd inspects, cleans and documents commercial ventilation systems for estates teams, facilities managers and responsible persons — delivered to TR19 guidance with the evidence you need on file.
- Pre and post-clean photographic verification
- Access panel survey and installation
- Out-of-hours and shutdown working
- Reports formatted for audit and insurance
- 2015
- Operating since
- UK-wide
- Directly employed engineers
- TR19
- Aligned methodology
- 100%
- Photographic evidence
Documented Ductwork Cleaning
Contaminated ductwork reduces airflow, increases energy use, degrades indoor air quality and creates a fire loading in extract systems. Where a building has no cleanliness evidence, the responsible person has no defensible position at audit.
Deduct surveys the system first, establishes measurable condition, then cleans and verifies to a defined standard. Every project closes with documentation you can hand to an auditor, an insurer or an incoming FM provider without further explanation.
We work across supply and extract ductwork, air handling units, fan coil units, risers, grilles and diffusers, kitchen extract systems and process extraction — in live healthcare estates, occupied offices, manufacturing plants and vessels.
What we clean
One contractor across the full ventilation asset — so nothing falls between suppliers and every system shares one reporting format.
Supply & Extract Ductwork
Rigid, spiral and flexible ductwork cleaned internally using brushing, compressed air and negative-pressure capture, with verification at defined test points.
Air Handling Units
Internal AHU deep cleaning: coils, drainage trays, fan chambers, plenums and filter housings, with filter change and condition photography.
Kitchen Extract Systems
Canopy, plenum, riser and fan grease removal to TR19 Grease, with deposit thickness readings recorded before and after works.
Read moreFan Coil Units
Unit strip, coil clean, condensate tray sanitisation and reassembly across offices, hotels and healthcare accommodation.
LEV & Process Extraction
Local exhaust ventilation ducts, hoods and collection systems cleaned to restore capture velocity and support COSHH duties.
Read moreAccess Panels & Enabling Works
Survey, specification and installation of access panels so systems can be cleaned and inspected properly in future cycles.
A five-stage delivery process
The same sequence on every project, from a single plant room to a multi-site national contract.
- 01
Site survey
Free attendance to assess system type, condition, access provision and operational constraints.
- 02
Scope & programme
Written scope, method statement, risk assessment and a programme built around your operating hours.
- 03
Access provision
Access panels installed where required, plus MEWP, scaffold or confined-space arrangements.
- 04
Clean & verify
Systematic internal cleaning with verification at agreed test points and full photographic capture.
- 05
Report & schedule
Compliance report issued with recommendations and the next inspection date scheduled.
Pre & Post Clean Photos
Genuine internal photography from Deduct projects. Every image is referenced to a system location so the report can be audited line by line.
Where we deliver ductwork cleaning
Regulated, operational and critical environments where the works have to happen around live activity.
Healthcare & NHS estates
Clinical areas, theatres and wards cleaned around live services with HTM-aware controls.
Commercial & FM
Offices, retail and mixed-use estates supported with planned ventilation hygiene programmes.
Industrial & manufacturing
Process extraction and factory ductwork cleaned to protect throughput and compliance.
Marine & offshore
Galley, laundry and accommodation HVAC cleaned in port and drydock.
A contractor your compliance file can rely on
Directly employed engineers, consistent reporting and years of work inside regulated UK estates.
- Established in 2015, working across regulated UK estates
- Directly employed engineers — no subcontract chains
- Methodology aligned to TR19, TR19 Grease, DW/172 and HTM 03-01
- Consistent report format across every site in your portfolio
- MEWP, cherry picker and confined-space access capability
- Live-environment working in healthcare, marine and manufacturing
- Planned maintenance scheduling with reminders before each cycle
- Single point of contact for multi-site national contracts
Ductwork cleaning questions
Common questions from facilities managers and estates teams about frequency, standards and evidence.
- How often should commercial ductwork be cleaned?
- Cleaning frequency is driven by system type, use and risk. Kitchen extract systems in heavy-use commercial kitchens are typically cleaned every three to six months, general supply and extract ventilation is usually inspected annually, and healthcare systems follow the frequencies set out in HTM 03-01 and the estate's own risk assessment. A condition survey establishes the correct interval for your building.
- What is TR19 ductwork cleaning?
- TR19 is the UK industry guidance for internal cleanliness of ventilation systems, published by BESA, with TR19 Grease covering kitchen extract systems. Deduct is not a BESA member; we are a member of NAADUK and work in line with relevant TR19 requirements. It sets out how systems are assessed, how cleanliness is verified and what evidence should be recorded. Deduct delivers inspection, cleaning and reporting aligned to that guidance.
- Will cleaning disrupt our building or production?
- Rarely. Most of our programmes run out of hours, at weekends or during planned shutdowns. We plan access, isolation and reinstatement with your FM or engineering team before mobilisation so the building can continue operating.
- What evidence do we receive after the clean?
- Every project is issued with a post-works report containing pre and post-clean photography, system schematics or asset references, verification results, access panel records, waste documentation and any remedial recommendations — formatted so it can be filed directly as compliance evidence.
- Do you install access panels?
- Yes. Many older systems have insufficient access for internal cleaning. We survey, specify and install access panels to the spacing recommended in industry guidance, then record every panel location in the report.
- Do you work nationwide?
- Yes. Deduct has operated nationwide since 2015 with directly employed engineers and its own fleet, covering England, Scotland and Wales including multi-site FM contracts.
Continue reading
Other services and guidance that sit alongside a ductwork cleaning programme.
Kitchen Extract Cleaning
TR19 Grease cleaning with deposit readings and insurer-ready evidence.
TR19 & Ventilation Hygiene
What the guidance asks for and how compliance is demonstrated.
Pre & Post Clean Reporting
What our documentation contains and how it is structured.
LEV System Cleaning
Restoring capture velocity across local exhaust ventilation systems.
Recent Projects
Completed ventilation hygiene works across UK sectors.
Sectors We Work In
Healthcare, commercial, industrial, marine and public sector estates.
Request a free ductwork cleaning survey
A Deduct engineer will assess your system, confirm the right scope and issue a written quotation with no obligation.
Tell us about your building
Share the basics and our technical team will come back with the right approach, timescales and cost.
Prefer to talk it through? 0333 772 0089