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Extension Sleeve for Underfloor Adjustable Telescopic Vents G961 Electrical Integral front grille prevents entryProduct Description Manthorpe G961 Extension Sleeve Pack of 1 Extension sleeve for telescopic vents. Part number: G961. Can be used for vertical or rear horizontal extension. Designed to be used with G960 Manthorpe telescopic vents. Each unit extends the under floor ventilator a further 150mm vertically or 185mm horizontally. Further extension can be added. Provides a maximum equivalent area of 6600mm airflow. Meets NHBC requirements for the control