This study investigated the presence of allergens such as dust and molds in heat recovery ventilation systems and the duct work. It also looks at two different types of cleaning equipment and their ability to clean these pollutants from the rigid and flexible ductwork and heat recovery ventilator (HRV) cores in dedicated balanced supply and exhaust ventilation systems. Samples from the ductwork and cores of ten ventilation systems were tested for levels of dust and mold.
Having paid out a great deal of money to have his ventilation system cleaned the client is entitled to ask 'what do I do next. This short presentation will attempt to answer this question by way of a series of recommendations based on over 40 years experience in Building Services Engineering. The recommendations that I shall make will cover the following points:
Inner surfaces of the supply air delivery system are part of the indoor surfaces. This and technical performance make it important that cleaning of a HV AC system should be included in a proper maintenance program. Research work and cleaning actions have been done in many countries, however, the methods to verify the cleanliness varies and they seem to measure unequally the cleanliness. Filter sampling method is the most used method for determination of dust and debris amount on the surface.
To achieve a high standard of indoor air quality for new building requires a special knowledge of emissions from materials, design of ventilation systems as well as construction practice. Besides regulations, common rules and instructions are needed to be obeyed to achieve a good result. Classification of cleanliness of new ventilation systems is a voluntary document which determines the cleanliness of classified components produced by manufacturers.
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