I purchased the 80"x36" door. It is a VERY heavy door. Very solid. It has four sets of hinges, whereas other bifold doors in our house only have three. It needs all four. It is a very attractive door. The film on the window panes is immensely appreciated, as I plan to stain it. The size of the doorway is slightly larger than 80"x36" (by about 1/4 inch in both height and width) so the installation was quick and easy. I took away one star because of the top U-bracket in which the door slides open and closed. The U-bracket isn't heavy duty enough for the weight of this door, and started bending after a few days of use. I bent it back with pliers, and tightened all of the screws until they almost started stripping; I hope that this stops it from bending again. Overall, I am very happy with the purchase and would highly recommend it.