The closest that we have for your application is the Replacement Exterior Pop-Up Roof Vent - Steel - 13-1/2" x 8" - Black # 9106 which fits a rough opening size of 11-1/8" long x 5-1/2" wide. It sounds like you might be looking for a really long custom-made vent which aren't able to produce, but you can install a few of these along your roof if this design is closer to what you're looking for. view full answer...