SAFETY & HAZARDOUS AREAS
The FumeCAB is a work top fume cabinet, with
integrated filtration systems
potentially causing reliability issues. The key decision for health and safety
managers is to evaluate the most effective means of ensuring both operator safety and optimal productivity. Typically, these options include captor
hoods, which use a capture velocity across the source of the emissions; receptor hoods, which use the movement of particles/vapour towards the device to capture them; partial enclosures, which extract contaminants typically for hand grinding and finishing; and full enclosures matched to the needs of automated processes such as laser coding, PCB manufacture and additive manufacturing. “There are also challenges that go beyond
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capture,” said Evans. “For example, extraction systems linked to thermal processes need to mitigate any potential fire risks. This is particularly important where a combustible dust has the potential to be drawn into the filtration system.” Under these circumstances, managers should specify a system benefiting from fire-
resistant materials for casings and filters and thermal cut-out protection. In the case of BOFA, the company has developed Spark Arrestor2 and FireBOX technology to mitigate the risk of burning particulate entering the fume and dust extraction system. Filtration technology is
also advancing, for example BOFA’s patented DeepPleat Duo pre-filtration uses reverse airflow to reduce the velocity of contaminant as it enters the filter chamber. Larger particulates fall into the steel drop-out chamber, while smaller particles are drawn into the filtration media. The very smallest particulate passes into the main High Efficiency Particulate Air (HEPA) filter, while vapours and gases are removed via a layer of activated carbon. Once this process is completed, clean air is returned into the workplace. The other key determinant for optimal
productivity is extraction system control. BOFA’s Intelligent Operating System (iQ) provides independent filter status monitoring to determine filter replacement in the most timely manner, reducing the risk of downtime. Evans concluded: “In short, better
information means better extraction performance and the avoidance of unnecessary downtime - and a safe breathing environment for operatives.”
BOFA International
www.bofainternational.com
MAY 2021 | PROCESS & CONTROL 23
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