10"X20" Canopy Valance cover fits a 10"X20" high peak(120 degree corner angle) frame. Actual Tarp Cover size is 12" X 20" that "extra 2 feet" is needed in order to cover gable angle of high peak (also know as "A" shaped) frame. If your frame purchased from any wholesale club like Costco, Sam"s Club, or Home Depot... This replacement cover is right size for your frame.