The G645 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 G645 Refurbishment Eaves Ventilator Panel is for 600mm rafter centres a 400mm version is also available Colour Black  Weight 6.0kg 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