Pressed bends are designed for building ventilation systems based
on spiral and plain ducts. Seam welds improve the air tightness of
the ventilation system, while the hemmed rim helps to avoid cutting
injuries during handling and installation.
The piece is connected with a duct by inserting one into the other.
The pressed form of the ventilation piece helps to reduce the flow resistance
and the pressure loss. Air tightness can be increased to class B by wrapping
the joints with the TAL, MET or DUCT sealing tape.