www . refrigerationandaircon . co . za RACA Journal I November 2024 41
Technical
ENHANCING AIR QUALITY :
INSIGHTS FROM SAIRAC CAPE TOWN CENTRE ' S FILTRATION TECH TALK
By Eamonn Ryan from a presentation by Peter Mostert
The latest SAIRAC Cape Town Centre Tech Talk ‘ Introduction to Air Filtration ’ was presented by Peter Mostert , managing director of Filta-Matix .
The presentation delved into both the challenges and advancements in ensuring superior air quality across various applications . It explored key topics including the complexity of filtration systems , the limitations of washable panel filters , and the latest in nano fibre technology .
One major highlight was the South African market preference of washable panel filters versus disposable primary pocket filters which offer higher levels of dirt holding capacity and reduced maintenance . Mostert explained that the fibre diameter together with progressive density technology ultimately determines filter efficiency . Higher efficiency filters such as 85 % ( MERV 13 ) and 95 % ( MERV 14 ) are required to effectively reduce contamination in general HVAC systems .
The new ISO 16890 standard establishes filter efficiency based on particulate matter ( PM ) which assists end users to determine filter efficiency by particle size .
Mostert urged the necessity for accurate testing methods and test reports to verify filter performance levels in accordance with ISO standards . The role of airflow and pressure drop testing was underscored , along with the importance of ISO 14644 standards for clean room validation .
One key takeaway was the need for local manufacturers to prove their capability in meeting international quality standards . The speaker invited attendees to conduct audits and assessments of their own manufacturing facilities as well as competing suppliers in order to assess quality management systems and technical capability .
One significant topic was the debate over pocket filter depth . Mostert emphasised the importance of media velocity and differential pressure . For example , a pocket filter designed with a depth of 300mm versus 600mm could impact the filter ' s performance and lifespan . At a typical velocity of 2.5m per second , a shorter pocket filter may reach maximum differential pressure prematurely , resulting in high operating costs .
Nano fibre technology allows for high-efficiency secondary filters , up to MERV 14 , to be used in constrained spaces of just
Images supplied by SAIRAC Cape Town Centre .
The latest SAIRAC Cape Town Centre Tech Talk ‘ Introduction to Air Filtration ’ was presented by Peter Mostert , managing director of Filta-Matix .
The presentation delved into both the challenges and advancements in ensuring superior air quality across various applications .
“ Nano fibre filters , will not provide the dust holding capacity of traditional filters like pocket filters or compact cassettes .”
www . refrigerationandaircon . co . za RACA Journal I November 2024 41