The Hambleside Danelaw roll panel vent prevents insulation blockage at eaves and allows high levels of cross flow ventilation. Use in conjunction with our range of soffit ventilators to achieve full eaves to eaves airflow. The HD 5000 is suitable for use on all roof pitches and meets regulation requirements of either 10,000mm2 or 25,000mm2 equivalent opening per metre.Universal rafter centre fitting capability. Conforms to 10mm and 25mm opening requirements.PropertiesAirflow: 25,000mm2 per metre.Length: 6m per roll.Pack size: 2x 6m rolls.Pack coverage: 12m.Material: PVC.Colour: black.