Abstract: An environmental control hood assembly includes a headpiece and a noise filter subassembly which is disposed within the headpiece adjacent its top wall. The filter subassembly includes a silencer member with an air-permeable wall portion and is connected to the conduit which in turn is connected to the source of air under pressure. The silencer member in turn is disposed within a foam member which is fabricated of an air-permeable synthetic resin open cell foam so that air introduced into the silencer member must travel a path through the silencer member and through the foam with resultant reduction in the sound level of that air. A barrier may be provided under the silencer to preclude direct flow of air from the silencer downwardly through the foam, and the filter subassembly may include a bottom sheet of an air-pervious material.

Abstract: A nuclear accident carrier for conveying an injured contaminated person comprising a portable base into which a stretcher supporting the person can be inserted, and a lid for isolating the person in the base from the outside. The lid is made from a transparent material and is provided along an edge with a sealing strip that, when the carrier is closed, is clamped between the edges of the lid and the base.