150mm 90° Square Bend (Depth: 75mm) – Horizontal This 90° square bend turns a run of 150 × 75 mm rectangular ductwork through a right angle in the horizontal plane, changing direction from side to side while the duct stays flat against a ceiling or wall. It is made from galvanised mild steel and supplied with slip joint female connections at both ends (A and B), one of the standard methods for assembling rectangular duct. Where a run needs to join other ventilation equipment, sheet metal flanges can be used instead. 75mm 90° Square Bend (Depth: 150mm) – Vertical This 90° square bend takes a run of 75 × 150 mm rectangular ductwork through a right angle in the vertical plane, turning the duct upward or downward where it needs to rise through a structure or drop to a grille or vent. Manufactured from galvanised mild steel, it comes with slip joint female connections at both ends (A and B), one of the standard methods of joining rectangular duct. Sheet metal flanges can be used instead where the run connects to other ventilation equipment.