All ventilation systems must achieve and maintain the required standards outlined in various legislation. Ingot provides complete service solutions to ensure clinical and office ventilation systems are inspected and maintained to a level that meets the requirements of HTM 03-01 and the Workplace, Health, Safety and Welfare Regulations Approved Code of Practice 1992.

Requirement for Maintaining Clean Ductwork

Generally there is a duty of care that an employer should supply a minimum quantity of “clean and purified air” this forms the crux of the legislation that is set out in the “Health and safety at work act 1973” obviously this applies to the entire workspace, but where you have a specific clinical requirement then other codes of practice come into play. So simply put you cannot get clean air from a dirty duct!

Although duct work may be filtered, no filter is absolute, even HEPA filters will let by some particles, but more over when they are changed dirt can be transferred into the clean side of the system, also typically the ductwork was never cleaned from new, only recently have new installations been required to have a pre clean.

There are also efficiency issues with having dirty ductwork, the dirt will inevitably contaminateand block HEPA filters reducing their life expectancy, it can also increase the resistance of the system further reducing the a vailable volume of air that can be supplied and putting additional strain on the fan and motor.

Ventilation Hygiene Services

Ingot offers specialist ductwork hygiene services for the following environments:

Hospital Ventilation Systems

We offer complete service solutions to ensure hospital ventilation systems are properly cleaned, tested and maintained in accordance to The Workplace, Health, Safety and Welfare Regulations approved Code of Practice 1992 and the Health Technical Memorandum 03-01 (2007).


Offices are covered by a Specification CIBSE TM26, which relates to office air hygiene and the methods to monitor and test air quality.


Ingot also has experience of cleaning hazardous materials found in pharmaceutical manufacturing as well as laboratories where animal management and welfare is paramount. The dust generated in these environments is particularly hazardous as it is hypoallergenic.