Sun-Tek 22 x 22 Tinted Polycarbonate Surface Mount Skylight. Sun-Tek surface mount skylights are easy and quick to install, manufactured with pre-punched flanges and ready to mount. They can be mounted flat on a metal roof or directly between your shingles and roof decking. Installation instructions are included for both applications. Sun-Tek Skylights have a Limited 5 Year Warranty. SPECIFICATIONS: Double pane which enhances thermal protection. Maximum roof opening size: 22 1/2" width x 22 1/2" length, Overall size including flange: 29" width x 29" length. Has no metal flange. Designed for use in Mobile Homes.