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AIR MOVEMENT


Clearing the air


The building services industry lives and dies by the rules it sets. But the latest ground-breaking standard on air fi lters is revolutionary in terms of its ‘real-world’ approach to fi lter testing and global scope. Mark Taylor of Camfi l explains.


Indoor air pollutants


Pollutants that can aff ect air quality inside buildings fall into one or more of the following categories:  Particulate matter – includes dust, smoke and tobacco smoke, pollen, animal dander, particles generated from combustion appliances such as cooking stoves, and particles associated with tiny organisms such as dust mites, mould, bacteria and viruses.


 Gaseous pollutants – come from combustion processes. Sources include solid fuel heating sources with insuffi cient venting, gas cooking stoves, vehicle exhaust and tobacco smoke. They also come from building materials, furnishings, adhesives, paint and varnish, cleaning products and pesticides.


 Environmental pollution – outside contaminants such as vehicle fumes and industrial pollution can seep into buildings, but there is also a risk from naturally occurring gases such as radon.


30 July 2018 www.acr-news.com T


he purity of the air we breathe has a profound impact on the quality of our lives yet it is something we tend, for the most part, to take for granted. This is astonishing given that we spend up to 90% of our lives indoors. The health eff ects of indoor air pollutants can include irritation of the eyes, nose, and throat; headaches; dizziness and fatigue; and exposure to poor indoor air quality can result in more serious conditions such as asthma, hypersensitivity pneumonitis, and humidifi er fever. The main barrier to these pollutants and the primary guardian of indoor air quality is the air fi lter. The arguments for good air fi ltration are compelling. People perform better with clean air


and a healthy indoor climate, and research proves that high effi ciency fi lters reduce the problems that small particles can cause for sensitive people. When outdoor air enters the ventilation system, contaminants – typically in the form of smoke, dust and pollen – are deposited on fans in air handling units, batteries and ducts. If the air fi lters fail to perform as they should, the air fl ow in the system is reduced and the balance between supply and exhaust air is distorted, damaging comfort levels and reducing energy effi ciency. Effi cient fi lters maintain the balance and keep odours and particles under control so that the system always performs at its best to provide clean air. Air fi lters particularly infl uence the indoor


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