Description This is a perfect solution for stairwells where under normal operating conditions this window serves the purpose of room ventilation and lighting. FAKRO smoke ventilation windows combine the standard function of a roof window with that of automatic smoke evacuation in a single product. Natural Smoke and Heat Exhaust Ventilator equipped with 4 x Actuators, Type DSF-D U6 Has the glazing unit 6H-Tg16Ar-4HT-18Ar-55.2T. Intended to be used in residential buildings and other intended for permanent dwelling. Package also includes the following: 1 x Control Unit RZN4408K. 1 x Alarm push button / Break Glass RT45 1 x Smoke sensor OSD 23. Features • Modern design - new smoke ventilation windows have the same profile as standard flat roof windows. • The upper part of the window comes with an innovative flat glazing unit DU6 Ug0.5W/m2K. • The size 105x105 has a 1m2 of geometric smoke ventilation area to meet the varied standards required in different countries. • DSF windows can be painted in any colour chosen from the RAL Classic palette.