The CAR3® is constructed of an amorphous thermoplastic resin featuring antimicrobial, anti-static, and flame retardant additives. The CAR3® is UL 2043 safety classified and labeled for flame and smoke generation. The assembly is sized to fit inside standard rigid round ducting, as well as fittings such as take-offs, tees, etc. A lip or flex-type ring seal gasket around the circumference ensures a tight, no-leak fit