Ventilation systems hygiene and assessment

Indoor air quality can impact the health, comfort and productivity of building occupants. Contaminated air can lead to Sick Building Syndrome; tiredness, lethargy, headaches, dry or itchy skin and eye irritation in employees. Those with asthma or patients in healthcare facilities are particularly vulnerable.

When is a ventilation condition report needed?

The Workplace (Health, Safety and Welfare) Regulations 1992, regulation 5, requires that mechanical ventilation systems are regularly maintained (including cleaned as appropriate) to keep them free from anything which may contaminate the air and cause health problems. There are two clear instances when a ventilation condition report and cleaning service may be required:

i. When a new ventilation system has been installed.

It is important to sanitise it before first use, to prevent contamination from the inevitable dust and other pollutants arising from building works. We issue a certificate of hygiene to confirm the system is safe for use.

ii. When a system has been in use for a lengthy period.

In some cases the naked eye can see mould and thick dust – but we also take swab tests to analyse the level of dust and bacterial deposits present. We interpret the lab microbiology results and advise if a clean is required.

We ensure that your ventilation system is clean or sanitised to the legal standards giving you peace of mind that the air being pumped into your facility is pure.

Contact us today for more information or to request a quote and ensure your building occupants can breathe freely.

Related Services:


BESA TR19 deposit thickness testing (DTT) for grease extract

Microbiological sampling (for mould and fungi)

Video camera endoscopic inspection (examining internal surfaces of non-accessible ductwork)


• Auditing/Service condition reports (inspection & survey of ventilation systems and grease extract)

• Ventilation hygiene reports (focusing on commercial kitchen ventilation)

• Full report supported by photographic evidence – (TR19 ductwork inspection report)


• Sanitisation and biological decontamination using fumigation (for ventilation internal surfaces)

• Ventilation system cleaning

• Laundry ductwork cleaning


Five stars to TWO services. Well done, we’re very happy with the end results and will continue to use your services.

Operations Manager ISS

We have 100% trust in TWO’s ability to complete the work as soon as possible for us. We look forward to continued service from TWO for a long time in the future.

Maintenance Manager The Hurlingham Club

I would like to thank the team at TWO for the support provided over the last 2 years. The support we get from the customer service team is above and beyond.

Business Support Manager Elior, UK

Following a recent deep clean the kitchen was left immaculate, thank you very much.

Baxterstorey Chef Manager

Over the past 10 years TWO have supplied a great service to the Hurlingham Club. We look forward to continued service from TWO.

Maintenance Manager The Hurlingham Club