The 220 x 90mm vertical 45-degree bend provides a gradual change of direction between different levels within a flat PVC duct system. The shallow angle supports smoother airflow and lower resistance than an abrupt vertical transition, making it useful where ductwork must rise or fall around framing, cabinetry or ceiling obstructions. Manufactured from lightweight, fire-resistant PVC, the fitting connects directly to the matching rectangular duct and is easy to install in residential and light-commercial supply or extract systems.