Manthorpe Refurbishment Eaves Vents - 400mm Rafter Centres (Box of 50) The G435 Refurbishment Eaves Ventilator is designed to be used in refurbishment situations and is fitted from inside the roof space to create a clear air gap between the loft insulation and felt, its flexible hinge enables it to achieve any roof pitch. The G435 Refurbishment Eaves Ventilator Panel is for 400mm rafter centres a 600mm version is also available.   Colour Black Weight 3.8kg Per Box Material Lightweight Rigid PVC Manufacturing Process Vacuum Formed Free Airflow 25,000mm/M equivalent to a continuous gap of 25mm Panel Depth 250mm