Model FX Fixed 16 x 46 Low-E Sky Light - Outside Frame: 16-1/2" x 46-3/8" - Rough Opening: 14-1/2" x 45-1/2" - Daylight Area: 11-1/4" x 41-17/32" - Low emission heat reflecting double glazing - beautiful, hand selected, vaccum treated, lacquered timber frames - new, easy, bracket free installation system - UV resistant cladding made from coated aluminum for long performance - Class 3 resistant to corrosion hinges - suitable for roof pitches between 15-85 degree