Purair Sky filtration units from Air Science, Fort Myers, Fla, protect laboratory personnel in environments where hazardous substances are handled. A filtration chamber and sliding filter clamp enable quick filter changes. Designed with the Air Science multiplex filtration system and enhanced filtration technology, the units come with an epoxy-coated steel support frame with LED lighting and wall mounted controls. Available in two sizes: the Sky-24 requires an opening of 22.75 inches × 22.75 inches, while the Sky-48 requires an opening of 45.5 inches × ?22.75 inches. For more information, visit Air Science.