Filtration

Filter shedding, glass fibre media, and unintended exposure. Air filtration is often treated as a one-way process: air goes in, contaminants are removed, clean air comes out. In practice, filtration systems are more complex than that. While filters are designed to capture airborne particles, the materials used to construct them, and how they behave once […]

The blind spot in ISO 16890 and minimum efficiency testing Minimum efficiency testing plays an important role in modern air filtration standards. It exists to answer a specific question: How does a filter perform once electrostatic effects have been neutralised, and performance is assessed on a purely mechanical basis? ISO 16890.4 was developed to address

Filter media binders, chemical emissions, and indoor air quality blind spots Air filtration is typically discussed in terms of particles. What is removed from the air, at what efficiency, and at what pressure drop. Much less attention is paid to the materials used to construct filters themselves, or to how those materials behave once installed

Understanding the difference between meeting standards and delivering performance In most organisations, air filtration decisions are grounded in compliance. Filters are specified to recognised standards, installed in accordance with guidance, and maintained to define schedules. When documentation shows that requirements have been met, it is reasonable to assume that filtration performance has been addressed. Yet

Mass stabilisation, filter ageing, and what standards assume Air filters are typically selected and judged based on how they perform when they are new.Efficiency ratings, pressure drop, and compliance with recognised standards all rely on laboratory testing carried out under controlled conditions. These results form the basis of specifications, procurement decisions, and maintenance strategies. But