Set includes 3pcs. 20.5″L x 6.5″W (2pcs) and 20.5″L x 6.25″W (1pc), forms up to 58.5″ long. Opening is 5.25″.
Window kit is secured in increments of 3/4″ (btwn 29″ to 58.5″), which may not conform to all window types.
Kit will not fit windows btwn 20.5″ to 29″, but can be modified (sawed off) to fit this range.