BenchVent Fume Filtration Hoods and Cabinets - BenchVent BV660H-C, The TechFlo Filtration Systems, Fume Cabinet BV660H-C is a circulatory fume filtration hood and cabinet, with an air capacity of 355m³/hr, that is ideal for use where contaminant capture and filtration are required but where external venting is impractical. Two stages of filtration, hood lighting and a clear polycarbonate