The Imperial USA HM-18GPF-SC-2668C door has nominal dimensions of 2'6" x 6'8" (30" x 80"). Typically, the rough opening for a door is slightly larger than the actual door size to allow for proper fitting and adjustments. Based on standard rough opening guidelines, a 2'6" x 6'8" door would generally require a rough opening of 32" x 82.5". Since your rough opening is 32" x 80", it may be slightly tight in height, depending on the frame and installation method. You might need to verify if adjustments are necessary for proper clearance.