TR19 Ventilation Hygiene Explained
TR19 is the benchmark UK estates are measured against for ventilation cleanliness. This page sets out what it asks for, what evidence looks like, and how Deduct delivers against it.
- What TR19 and TR19 Grease cover
- How cleanliness is measured and verified
- What a compliant evidence pack contains
- How frequencies are set by risk and use
- TR19
- General ventilation
- TR19 Grease
- Kitchen extract
- DW/172
- Kitchen ventilation design
- HTM 03-01
- Healthcare ventilation
Guidance exists because the duty is legal
No regulation names TR19 directly. What the law does require is that ventilation is maintained, that workplaces are supplied with adequate fresh air, and that fire risk is assessed and controlled.
TR19 gives the responsible person a recognised method for meeting those duties in relation to ventilation hygiene: assess the system, define test points, measure condition, clean to a stated standard, verify the result and record it.
The practical benefit is defensibility. When a fire risk assessor, insurer, environmental health officer or incoming FM provider asks what condition the system is in, the answer is a dated report with measurements and photographs rather than an assurance that it was cleaned at some point.
Deduct works to that methodology on every project, in every sector, using one reporting format so evidence stays consistent across a whole portfolio.
What TR19-aligned delivery involves
The elements that turn a clean into evidence.
Pre-clean assessment
System condition assessed and graded at defined test points, with deposit measurement recorded.
Access provision
Access panels specified and installed where spacing is insufficient for inspection or cleaning.
Cleaning to standard
Internal cleaning using brushing, air lancing and negative-pressure capture appropriate to the system.
Post-clean verification
The same test points re-measured and re-photographed so improvement is demonstrable.
Declared limitations
Any area that could not be reached is recorded and marked, never quietly excluded.
Frequency setting
Next inspection interval recommended based on system type, usage and risk.
From guidance to a defensible file
How a TR19-aligned project is delivered and documented.
- 01
Establish assets
Systems identified and referenced so evidence can be tied to locations.
- 02
Assess condition
Test points defined, deposits measured, condition graded and photographed.
- 03
Agree scope
Written scope, method statement and programme issued before works begin.
- 04
Clean & verify
Cleaning delivered and results re-measured against the same test points.
- 05
Record & schedule
Report issued for the compliance file and the next cycle scheduled.
What verified evidence looks like
Internal photography captured against referenced test points on Deduct projects.
Compliance evidence built the same way every time
Consistency is what makes a portfolio auditable rather than a collection of unrelated reports.
- One methodology and one report format across every site
- Measured results, not subjective descriptions
- Inaccessible areas declared and routed to a fix
- Access panel installation to make systems verifiable
- Aligned to TR19, TR19 Grease, DW/172 and HTM 03-01 practice
- Directly employed engineers trained to the method
- Scheduling that prevents cycles from lapsing
- Reports written for auditors, insurers and enforcing officers
Frequently asked questions
The questions responsible persons ask most about ventilation hygiene guidance.
- What is TR19?
- TR19 is the UK industry guidance on internal cleanliness of ventilation systems, published by BESA. TR19 Grease is the companion guidance for kitchen extract systems. Together they describe how systems should be assessed, cleaned, verified and recorded. TR19 is guidance rather than an accreditation. Deduct is a member of NAADUK and carries out work in line with relevant TR19 requirements.
- Is TR19 a legal requirement?
- TR19 is guidance, not legislation. However, duties under the Health and Safety at Work etc. Act 1974, the Workplace (Health, Safety and Welfare) Regulations 1992 and the Regulatory Reform (Fire Safety) Order 2005 require ventilation to be maintained and fire risk controlled. TR19 is the recognised way of demonstrating that ventilation hygiene has been managed competently.
- How is TR19 compliance demonstrated?
- Through evidence: a condition assessment, defined test points, measured deposit levels before and after cleaning, photographs referenced to system locations, a record of any inaccessible areas and a stated next inspection date.
- What is the difference between TR19 and TR19 Grease?
- TR19 covers general ventilation hygiene for supply and extract systems. TR19 Grease addresses the specific fire risk created by grease deposits in commercial kitchen extract systems, including measurement criteria and cleaning frequencies based on usage.
- How does HTM 03-01 relate to TR19 in healthcare?
- HTM 03-01 governs specialised ventilation in healthcare premises and sets its own verification and maintenance requirements. In practice a healthcare estate applies HTM requirements to specialised systems and TR19-aligned hygiene practice more broadly.
Continue reading
Other Deduct services and guidance relevant to this work.
Commercial Ductwork Cleaning
TR19-aligned cleaning, verification and reporting for supply and extract systems.
Kitchen Extract Cleaning
Grease removal to TR19 Grease with deposit readings and insurer-ready evidence.
Pre & Post Clean Reporting
How our compliance documentation is structured.
Ventilation System Inspection
Condition assessment, hygiene verification and cleaning recommendations.
Contact the Team
Book a free site survey or ask a compliance question.
Sectors We Work In
Healthcare, commercial, industrial, marine and public sector estates.
Bring your ventilation records up to standard
We will assess what you have, identify the gaps and build the evidence base your compliance file needs.
Talk to us about TR19 compliance
Tell us what records exist today and we will advise on the shortest route to a defensible position.
Prefer to talk it through? Call 0333 772 0089 or email hello@deductltd.co.uk.