The 90˚ elbows are fitted with sheet angles, and the entire product
is braced by cross-wise ribbing.The elbows are recommended for low air
velocity and/or low-pressure ventilation systems and smaller sizes of
side b ≤ 400 mm. The standard radius is r = 120 mm.
Typical applications of the elbows include rerouting the ductwork by
90 degrees with the same clear cross-section.
