[EN 12792:2003, 343]:frames, tie rods or the like, which increase the stiffness of the walls of the ducts in order to reduce the risk of vibration due to the velocity of the air and/or to reinforce the duct against the … Continue reading →

[EN 12792:2003, 344]:duct component with a constant straight section along the considered element; it can be either rigid or flexible, a flexible duct is one which can change orientation without the use of a fitting.

(See flow equaliser)