I have two intakes for my chimeny top, about 12x 12 inches each located next to each other. Aka 25 x 25 ish inches, so I was short.After assembly the cover on the ground and once I got it up the ladder, came to find out find out it didn’t fit quite well. By losing the two corner screws on all four metal ends, I was able to pinch the middle short sections and shove them on each end.By hammering them intensively I was able to get the cage over and settle to the best of my ability but it looks fine and it won’t go anywhere.Measure your chimeny and call the company before ordering.