Product Description: - All hollow glass upgraded to double-layer tempered glass as per national regulations. - Suspended sash windows suitable for heights of 185cm to 200cm. - Easy to upgrade, continuously enhancing product performance. - Sash can flip 160 degrees for indoor cleaning of the exterior glass; sash can be flipped and fixed at window cleaning position. Roof Window Sizes and Opening Dimensions: - Roof Window Models: M04, M06, M06, S06, S08 - Roof Window Sizes (Width x Length) mm:mm: 780x980, 780x1180, 780x1400, 1140x1180, 1140x1400 - Roof Window Opening Sizes (Width x Length) mm:mm: 800x1000, 800x1200, 800x1420, 1160x1200, 1160x1420 Product Advantages: 1. Excellent lighting. Tested and proven, the skylight's lighting effect is over 10% better than that of standard windows. You can delay turning on the lights by one hour each day, while enjoying the night sky and adding ambiance. 2. Heat insulation and energy conservation: The skylight uses hollow glass with a thermal conductivity coefficient 2.5 to 4 times lower than that of standard glass. A test in the hot season in Guangdong showed that, under the same environmental conditions, a standard glass window would require air conditioning to be turned on 10 times in a month, while a room with hollow glass would need only 3 times. 3. Noise reduction: The hollow glass of the skylight can block over 30 decibels of noise. 4. The skylight uses a central pivot opening mechanism, facilitating air circulation indoors, making the room fresh even during the coldest season without a face of cold wind. It's also easy to open and clean the sash and glass on both sides.