The present invention, in the exhaust duct construction of the semiconductor production field (FAB or Fabrication), relates to the connection port and connection construction method using the connecting branch of the main duct of the FRP material as SUS material, the FRP material main duct and SUS the connection of the branch pipe of the material, simpler, it is possible to increase the airtightness and maintenance convenience.
Connection port (J) according to the invention,
And contact plate 10 attached to the outer surface of the main duct,
Once passing through the contact plate, and formed integrally in the inserted state, whereby the other end is composed of the branch pipe flange 21 is connected to tube 20, provided with a connection and which,
After attaching the contact plate on the surface outside the main duct (1) of the FRP material, the end flange of the integral connector (20) formed in the contact plate with said branch pipe (2) flange and butt bolting the clamp (C) simply it can be bonded.