This document discusses managing ventilation hygiene risks according to industry guidance TR/19. It outlines key risks of poor ventilation hygiene like fire spread and reduced efficiency. UK regulations require employers to conduct risk assessments and ensure ventilation systems are suitably maintained. TR/19 provides best practice guidance for internal cleanliness of ventilation systems, defining cleanliness quality classes. It advises inspecting and testing new systems to ensure acceptable contamination levels before commissioning, and maintaining systems according to TR/19 through risk assessments, access provisions, and monitoring conditions based on cleanliness classes.

1. TR/19 Second Edition
Managing Ventilation Hygiene Risks
Presented by
Gary J Nicholls Co-author TR/19

2. Agenda
• What the law requires
• Key ventilation system risks – hygiene related
• What TR/19 is
• System cleanliness quality classes
• A suitable system to manage ventilation
system hygiene

3. Poor ventilation hygiene - key risks
• Fire and the spread of fire
– Forensic fire investigators state 25% significantly
worst
• Reduces efficiency – higher energy spend
– Heat transfer and fan energy requirements
• Quality of air that we breathe
– Duct 10% of floor area

4. Regulations are Laws approved by
Parliament
• Management of Health and Safety at Work
Regulations
– duty of care on every employer to conduct a risk
assessment
• Workplace (Health, Safety & Welfare)
Regulations (L24 second edition 2013)
- Regulation 5 imposes a duty to clean
ventilation systems “as appropriate“ and ensure
they are subject to a suitable system of
maintenance
- Regulation 6 require building owners and
managers to ensure that enclosed workplaces are
ventilated with fresh and purified air

5. What is TR/19?
• Industry - Guide To Good Practice
• Subject - Internal Cleanliness of Ventilation Systems
• Written by Industry experts/practitioners, developed/improved
over past 23 years
• Latest version published by B&ES in July 2014
• Publishing history
– DW/TM2 1991 – guidance on protection against dust egress into
ductwork during construction
– TR/17 1998 introduced for the first time in the UK good practice guidance
testing/verification
– TR/17 Second Edition 2002 more detailed guidance for kitchen extract
systems
– TR/19 2005 – added a revised version of TM2 for
– TR/19 Second Edition 2013, incorporates philosophy of BSEN15780, new
system verification & improved kitchen extract fire safety

6. Define cleanliness quality classes
(TR/19 2013, BSEN15780, BG 2013)

7. Ensuring new ventilation system
cleanliness
• Construction site dusty environment
• Chimney effect
• Affectivity of protection measures
• Dust ingress inevitability
• Miles on the clock!
• Inspect & as required test to quality class
• Pre-commission clean/test/handover

8. tree
TR/19
New
System
Decision
Tree

9. New Ventilation System
Acceptable or not?

10. Objective measurement
Dust/contamination level testing
• Deposit Thickness Test (DTT)
• Preferred Vacuum Test (PVT)

11. Commission to TR/19
Maintain to TR/19

12. A suitable system of maintenance
includes
Risk Assessment to TR/19
– Adequate access?
– Monitor/test conditions based on cleanliness
quality classes

13. Failure
of
Duty

14. Adequate access?

15. Monitor/test conditions based on
cleanliness quality classes

16. Unacceptable contamination affects
Quality of air that we breath

17. Follow TR/19 guidance for suitable
ventilation hygiene control
• Cleanliness quality classes
• Adequate access for inspection/testing/cleaning
• Cleanliness of newly installed ventilation systems
• Implement a management system to control risks
with periodic inspection and testing
• Testing fire damper function
• Cleaning as appropriate
• Log book/record keeping to evidence
• A suitable system of maintenance
• Compliant duty fulfilled