VELUX FCM 2222 0004 Skylight, 24 3/16" W x 24 3/16" H Fixed Curb-Mount w/Laminated LowE3 Glass Inside curb dimensions for Velux FCM 2222 models are 22. in. by 22. in. and outside curb dimensions for FCM 2222 models are 25. in. by 25. in. Qualifies for 10-year "No Leak" installation warranty when installed with VELUX ECL shingle roof or ECW tile roof flashing (sold separately) on roof pitch between 10 and 60 degrees Features laminated Clean, Quiet Safe glass with Neat glass coating that keeps your skylight cleaner, reduces unwanted outside noise, is energy efficient, and has an extra glass