I have a fairly standard sized window of 32". I had to fit the vent slider into 31". Unfortunately it was way too long. When I slid it out to the 31" length, the opening for the vent was still covered over by the other end of the slider by about 4-6". I had to have it professionally cut to fit the shorter length. Another issue for me was a metal lip extending up from the window sill, which also covered part of the hole. I am wondering if there are other window kits available to accommodate this machine that would be higher and shorter?