Skylight Dome 14 X 30, 16 X 32, Tinted Sheds Moble Homes Rv Campers Single Layer Unbreakable Polycarbonate Tinited Pre Drilled mounting holes Completely assembled - easy to install Rough cut 14-1/2" x 30-1/2", Overall 21-3/8" x 37-3/8" end of flange Excusive water control devices Vent System / NASA vent on lower end of skylight