The rigid pipe is identified as Direct-Temp. This is a coaxial pipe system designed for use on direct vent gas appliances. The system employs an interlocking method between pieces. The sections are constructed of a galvanized steel outer pipe and a stainless steel inner pipe.
The flexible vent is identified as Direct Vent DT Chimney Liner System and is constructed of 0.018-in aluminized steel. The male/female end connectors are constructed of a combination of 0.018-in galvanized steel (outer part) and 0.012-in aluminum (inner part). See Appendix A for additional details.
