G-Series Curb Mounted GS Series Permatherm Fixed Glass Skywindow - 30-30 Triple Glazed Glass (TGT) - Minimum 3-1/2" Curb Height Required - Built for your Custom Size Requirements: Select Outside Curb Width and Height Dimensions in Inches - For use with curb and flashing supplied by others - No minimum pitch required - Not for vertical applications - 3 to 4 week lead time - Requires Signed Approval