Best accordian door I have installed.  I selected this door because it said you could shorten the height by cutting the bottom of the door.  tape bottom of door so panels don't move.  remove lots of screws small head (will need a #1 philips  screw driver that is not in the instructions".  I used  chop saw to cut the bottom good clean cut.  then reinstall screws.   Door still to long forgot to subtract the depth  of top track from the measured height of the door opening and had to recut.  All fits fine now.  This door has a channel that the edge of the door fits it when closed as well as magnets.  This gave a cat proof closure