Purair 5 ductless fume hoods from Air Science USA, Fort Myers, Fla, are designed to support a high level of operator protection during routine applications. Exceeding all relevant industry standards, the unit’s ductless design eliminates installation costs and enables positioning over a sink or benchtop apparatus. Three available models offer a choice of 24-inch, 36-inch, or 48-inch widths. The units operate at low noise levels, and because they recirculate, they do not exhaust expensive conditioned or heated air into the atmosphere. A face velocity of 100fpm ensures containment of fumes and particulates for operator protection. An alarm alerts the operator when the airflow falls to an unacceptable level, and an optional polypropylene spillage tray can be provided when required. The rear of the unit has lighting to illuminate the work surface. All mechanisms in the head section are on the clean side of the filter, with the switches and electrical components being isolated from any contamination. The main filter can be chosen from 14 different types of carbon, which include specialty media for vapors of acids, formaldehyde, organics, mercury, and solvents. High-efficiency particulate arrestance filters for particulate filtration are also available. For more information, visit Air Science USA.