VELUX smoke ventilation system allows a roof window to provide smoke venting when required. Package includes a single electrically operated GGU White Polyurethane roof window with laminated inner pane for additional safety, 1 smoke sensor, 1 break glass point, 1 wall control unit and suitable flashing. Maintenance free PU smoke vent window, slate flashing, 134x140 Automatic smoke vent providing 1.5m² of smoke-free ventilation area Includes wall mounted control unit, break glass unit and smoke detector Additional smoke detectors and break glass units can be purchased separately Tested for geometric smoke ventilation for roof pitches of 15 degree to 90 degree EN ISO 12101-2