Inner Dome Dimensions (this is roughly the size of the hole you will need in your unit): 14 1/8" wide X 22 1/8" long
Exterior Dimensions: 17 7/8" wide X 26" long 5" tall
COLOR Smoke Tinted MOUNTING FLANGE DIMENSIONS 17 7/8" X 26" Pre-drilled For Easy Mounting STICKER ON VENT will say 14" x 22" due to dome size DOME DIMENSIONS (this is roughly the size hole you will need in your unit) 14 1/8" X 22 1/8" (4 1/4" height) MOUNTING HARDWARE INCLUDED 1 tube Alpha Systems 1021 Self Leveling Caulk tape (11 fl oz.) 88" Putty tape - 28 Pan Head Screws #8 x 1" NO GARNISH RING We do not carry interior garnish / trim / beauty rings for any of our skylights, most skylights are trimmed-out with wood like in a house. NO INSTALLATION INSTRUCTIONS MADE IN USA from shatter-proof Plastic Premium design made from 50% stronger material than ordinary RV skylights Small mark in middle of skylight from manufacturing process, does not effect skylight, all Lexan skylights will have this mark.