An assessment of the problems associated with remote handling, changing, and disposal of filters suggested that significant advantages to filtration systems could be made by the adoption of high efficiency particulate air (HEPA) filters with circular geometry for both new and existing ventilation~plants. The circular filter development has considered filters for a range of flows from 45 m³/h up to 3400 m³/h; for small glove boxes to large-volume installations. The development has also concentrated on filter systems employing simple change techniques that take advantage of the circular geometry.

Units: SI