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Technical
50mm deep . Despite the reduced depth compared to pocket filters , nano fibre filters offer a viable solution where space is limited .
Attendees had the opportunity to view and handle samples of nano fibre filters , which have revolutionised filtration by allowing for high-efficiency performance in compact designs . Mostert also covered the balance between media area and fibre diameter , noting that traditional synthetic fibres like polyester could not achieve the same efficiency levels due to the limitations of extruding fine fibres for increased efficiency levels .
These nano fibres , produced through advanced manufacturing techniques , resemble a spiderweb structure with multiple layers to enhance efficiency . This technology has evolved to create fine fibres to improve filter performance .
A critical point addressed was the balance between filter efficiency and lifespan . Nano fibre filters , will not provide the dust holding capacity of traditional filters like pocket filters or compact cassettes . Like all secondary filters , products containing nano fibres have to be protected with primary filtration . By doing so , a manageable lifespan can be ensured . The audience was reminded that nano fibre technology was a viable solution in areas where space was limited and not necessarily directly equivalent to filters with larger effective media area .
Nano fibre filters are not washable and will require replacement when the final differential pressure has been reached . The specific lifespan will depend on environmental conditions but when used with high quality primary filtration , lifespans of 12-18 months can be achieved .
Despite the advancement in technology of primary and secondary filtration , only HEPA filters can provide absolute filtration efficiency levels . For purposes of this presentation , Mostert dealt with the advances in test methods of primary and secondary filtration as depicted in EN ISO 16890-1:2016 .
The total cost of ownership of filtration products is not limited to just the initial purchase price but will include dust holding capacity . It was stressed that selecting filters based on the environment ' s specific dust load can help optimise both performance and cost-effectiveness .
He highlighted the role of consultants and contractors in implementing effective filtration systems . Contractors are encouraged to specify their needs clearly and to seek guidance from suppliers on selecting the right products . This collaboration ensures that filters meet the required performance criteria and adapt to the unique demands of each facility .
ISO 16890 allows for a detailed breakdown of filter efficiency based on particle size distribution , which can help better
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RACA Journal I November 2024 www . refrigerationandaircon . co . za