Abstract: A work station for use when working with radioactive and other toxic or hazardous materials having an enclosed centralized work area which is normally open to the surrounding space in order to permit worker access, and in which a positive airflow is created into and within the work station to prevent the release of contaminated and toxic gases and particles through the access opening.

Abstract: Compact centrifugal fan and filter assemblies for use in providing laminar flow clean air to a work space environment such as those within clean rooms and clean air work stations or cabinets wherein the fan and filter element are mounted in a close physical relationship with respect to one another and within a common plenum chamber and wherein the fan creates an airflow which is initially generally parallel with respect to the filter element and which is thereafter channeled by baffle members so as to provide uniform air pressure and airflow across the filter element while reducing vibration and increasing the air flow rate from the fan and filter assemblies to such clean air environments.

Abstract: An apparatus for providing a prefabricated knockdown clean room which may be readily assembled without tools in a minimum of time. The apparatus includes a plurality of building segments which cooperate with each other in assembled relationship and certain of such segments include means for moving air under pressure through a filter media which removes substantially all micro-organisms from the air within the apparatus to supply Class 100 air to a restricted area.