Class II B2 Biological Safety Cabinet FM-BSC-A501 Fison Class II B2 Biological Safety Cabinet ensures maximum safety when handling biological materials. Featuring a 420mm opening, controlled airflow and interlocking functions, it includes an alarm system for abnormal airflow and filter replacement. With a washable pre-filter and ULPA filter 99.999% efficiency, it offers enhanced safety and comfort with a large, flat surface.