TM26 Hygienic Maintenance of Office Ventilation Ductwork

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For the best in deep cleaning and certification, call 0800 999 6066 

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For the best in duct cleaning, call 0800 999 6066 

[/vc_column_text][vc_empty_space height=”8px”][/vc_column][/vc_row][vc_row height=”small”][vc_column][ultimate_heading main_heading=”TM26 Hygienic Manitenance of Office Ventilation Ductwork (CIBSE)” heading_tag=”h1″][/ultimate_heading][/vc_column][/vc_row][vc_row height=”small”][vc_column width=”2/3″][vc_column_text]This publication aims to demonstrate to building managers the importance of ductwork maintenance and to provide practical guidance on the proper procedures for maintaining ductwork systems in a safe and effective state.

Recent publications from the Heating and Ventilation Contractors Association (HVCA) and Building Services Research and Information Association (BSRIA) have provided a general review of the issues of ventilation system hygiene and ductwork cleaning. BSRIA has also produced a standard form of contract for ductwork cleaning, with associated guidance. These documents give specific guidance on good cleaning and maintenance practices for ductwork systems in terms of particulate (dust) contamination only.[/vc_column_text][/vc_column][vc_column width=”1/3″][us_single_image image=”2011″][/vc_column][/vc_row][vc_row height=”small”][vc_column][vc_column_text]The guidance contained in this publication is intended to add to that good practice by providing guidance for managers of buildings that are air conditioned, or otherwise mechanically ventilated, on the issues of assessment and maintenance of the microbiological cleanliness of ductwork systems. For those who are unfamiliar with current practice in air duct systems, a separate section reviews this subject.

This publication gives guidance on the methods to use when obtaining microbial samples from the air in occupied spaces and from the inside surfaces of the ducts. It also indicates the levels of microbial contamination that are likely to be found on uncleaned and cleaned duct surfaces, and draws on a body of expert opinion to help the building manager to interpret the results of sampling. The procedure may also be used to assess the residual microbial contamination following a commercial cleaning process, or following disinfection, and as a remote means of assessing the performance of filtration of ventilation air.


1 Executive summary

2 Legislation

3 The status of TM26

3.1 With respect to health and safety regulations

3.2 TM26 in the context of other guidance

4 How to use this guidance

5 Ductwork hygiene indicators

5.1 Approach

5.2 Sampling methods

6 Air quality in buildings

6.1 Indoor pollutants

6.2 Microbial contaminants

6.3 Airborne microbial contaminants

6.4 Microbial contamination in buildings and air distribution systems

6.5 Health aspects of microbes in buildings

7 Cleaning air distribution ductwork systems

7.1 Mechanical cleaning methods

7.2 Use of biocides

7.3 Reducing the admission of micro-organisms

8 Protocol for sampling air in occupied spaces

8.1 Personnel

8.2 Equipment

8.3 Laboratory

8.4 Safety

8.5 Methodology

9 Protocol for surface sampling

9.1 Personnel

9.2 Equipment

9.3 Laboratory

9.4 Safety

9.5 Methodology

10 Interpretation of sampling results

10.1 Air sampling microbial limits

10.2 Surface sampling microbial limits

10.3 Actions following interpretation of the sampling results


Appendix 1: Glossary of microbiological terms

Appendix 2: Results of micobial sampling in indoor air and the

ventilation ductwork at a selection of UK buildings

Appendix 3: Air duct systems

Appendix 4: Expert Panel members[/vc_column_text][/vc_column][/vc_row][vc_row height=”small” bg_type=”bg_color” bg_color_value=”#a0a0a0″][vc_column][vc_column_text]

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0800 999 6066