A chimney damper that includes a rigid first peripheral frame surrounding an open window area, a cap moveable toward and away from the open window to selectively close and open the same and springs interconnecting the cap and frame resiliently urging the cap to an open position. The process integrates Fischer-Tropsch technology with gasification and hydrogen rich gas stream generation. In addition, the coinjection stretch blow molded container of the present invention has a good appearance and can be stably produced in long-run working lines.