Manthorpe G962 Remote Void Vent Pack of 1 Remote void ventilator. Part number: G962. The adapter fits directly onto the bottom of the G960 Under floor vent. Can be easily cut down between the pre moulded cut lines to fit the G930 airbrick. Provides a maximum equivalent area of 8800mm² airflow. Meets NHBC requirements for the control of condensation in buildings. Size inmformation: 74mm x 236mm to 4 inch diameter. Other ventilation fittings for this product available in our shop.Key Features 8800mm² airflow. Allows ventilation to an underfloor void. Works with G930 and G960. Sleeves onto 4” round pipe or Manthorpe’s GRP flexipipe.Regulations & Standards BRE Digest 17. BRE Digest 262. Building Regulations C4. NHBC Standards 5.2. BS 5250:2011 Control of Condensation in Building.