Ductwork Cleaning Services

Almost any public building in the UK will have ductwork in it. It comes in all shapes and sizes and much of it is hidden from view.

This however does not prevent the accumulation of dust and debris pathognes, vermin and over a period of time a significant build up can occur.

Breathing in air which flows over this can cause a serious risk to health and wellbeing of all who inhale it.

To counter this major issue various guidelines have been issued to clean ductwork. They can be found in B&ES TR19, BS EN15780, HTM 03-01 and TM26.

Entry points in the form of access panels are required to gain entry into the ductwork. The intervals for entry are specified in B8ES DW/144 and in B&ES TR19. Our fully trained technicians can fit access panels with the minimum of disruption to yourselves.

Once entry to the ductwork has been achieved various methods of ductwork cleaning are employed depending on the type of building, ductwork and contamination.

Overclean’s preferred method is rotary brush cleaning in conjunction with an air mover. Other methods such as wanding, manual hand cleaning and air whipping can be employed if necessary.

Testing compliant with TR19 and BS EN15780 can be carried out by our operatives and verified by an Independent UKAS Laboratory;  South West Water.

Cleanliness of Ventilation Systems to BSEN 15780

The following is a quick check compliance chart to ensure clients are aware of their responsibilities.

These are the recommended period for inspections:

AHU 24 Mths 12 Mths 12 Mths
Filters 12 Mths 12 Mths 6 Mths
Humidifiers 12 Mths 6 Mths 6 Mths
Ductwork 48 Mths 24 Mths 12 Mths
Air Terminal Devicec 48 Mths 24 Mths 12 Mths



Low: Rooms with only intermediate occupancy. e.g storage and technical rooms.

Medium: Office, Hotels, Restaurants, Schools Theatres, Residential Homes, Shopping Areas, Exhibition and Sports Halls, General areas in Hospitals and General working areas in Industries.

High: Laboratories, Treatment Areas in Hospitals and High Quality Offices.


Under current standards clients’ air conditioning should be maintained to the new British Standards, failure to do so would leave them open to litigation from anyone claiming their respiratory problems were made worse by the air conditioning.

By inspecting and taking action to the relevant British Standards you will prevent problems caused by the air conditioning.