Daylight, fresh air, and convenience are the main factors of the E-Class Skylight Series. This self-flashed deck mount skylight delivers more light per opening and install in roughly 1/3 of the time as other skylights thanks to its patented one-piece extrusion. It features a condensation control without the use of weep holes. E-Class Skylights make the perfect addition to any home. With no mastic, step-flashing, or sealants, this skylight is ready to be installed right out of the box while delivering up to 22% more daylight. The E-Class Fixed Skylight can be installed in as little as 30 minutes. Rough Opening: 22-1/2" X 22-1/2". Daylight Area: 21-1/8" X 21-1/8". Daylight Area (Sq. Ft.): 3.09.