Ventilation Downpipe Reducer 150 to 100mm

A round air vent reducer engineered for downward air transfer in vertical and horizontal ventilation runs across UK homes, flats, and utility structures. Supports five standard diameters: 150mm input, stepping down through 125mm, 120mm, and 110mm to a final 100mm outlet. Manufactured from rigid plastic, it delivers structural integrity without added weight — facilitating safe handling and secure mounting in overhead or confined locations. Its simple geometry enables rapid orientation and sealing, making it well-suited for both new-build commissioning and renovation upgrades where ductwork adaptation is unavoidable.