VENTILATION DUCT

摘要

A duct includes a number of wall sections which are at least partly produced from fibre material and a binder agent. Together, the wall sections define a closed, elongate flow space. The wall sections which meet one another are united by the intermediary of at least one longitudinal fold or joint line. In the fibre material and the binder agent of the duct, there are disposed longitudinal rigidifying elements. On the outside of the duct, there are longitudinal bead-liked projections which include the fibre material and the binder agent.

主权项

1. A duct comprising a number of wall sections at least partly produced from fibre material and a binder agent, which together define a closed, elongate flow space, mutually meeting wall sections being united by the intermediary of at least one longitudinal told or joint line, wherein there are disposed, in the fibre material and hinder agent of the duct, longitudinal rigidifying elements and that the duct has, on its outside, longitudinal bead-like projections which comprise the fibre material and the binder agent.