1.Top hinged roof window-TP series. 2.The big ventilation can allow the amount of fresh air which can be drawn into the room Top hinged roof window-TP seriesManufactured in pine,vacuum impregnated and coated with Environment-friendly lacquer.Big ventilation allow the amount of fresh air flow into the room with window closed.Unique handle for easy opening.Suitable for roofs with pitches between 150 and 900