Where problems start
Airborne contaminants originate from a multitude of sources, ranging from the operation of office equipment to vapours from solvents and resins used in furniture, carpets and building materials. However, it is well understood that a primary source of most indoor air contamination is the bacterial and fungal colonisation of air filters, heat transfer coils and ductwork within the HVAC systems of modern buildings.
Too often, the approach to mechanical plant maintenance as it relates to indoor air quality is reactionary, with re-mediation work conducted in response only to known problems. It is essential that this approach be replaced by a focus on prevention. By implementing and adhering to a proactive monitoring, maintenance and treatment program, building managers can dramatically impact the levels of airborne biological contaminants within their indoor environments, contributing materially to the improved health and well-being of building occupants. Importantly, effective plant maintenance gives rise to a multitude of additional benefits beyond improved indoor air quality. Bio-film accelerates the corrosion and degradation of aluminium coil surfaces, while fungal growth accelerates the rate at which filters become blocked.
By inhibiting microbial colonisations, one helps to extend the useful life of key air handling components. A well maintained mechanical plant consumes far less energy than systems whose heat exchange and air resistance characteristics have been impaired by the presence of bio-film. Well maintained systems yield significant cost savings through improved operating efficiencies. With HVAC contributing materially to global energy use, this improved efficiency also yields direct environmental benefits and greenhouse gas reductions.
