.~ Providing a restricted or insulated environment (i.e., sealable) for internal elements
DEFINITION
Classification: 16/2.2
Providing a restricted or insulated environment (i.e., sealable) for internal elements:
(under subclass 2.1) Bushing particularly adapted to prevent the flow of heat or material from one side of the structure to the other.
(1) Note. Included herein are firebreak devices, which prevents smoke and flames from traveling through a wall along the axis of a conduit, and means to insulate electrical conduits
