Stack Door is a division of Horton, Inc. located in Wellington, KS. The Stack Door has been in production since 1967. 

The Stack Door installs on virtually any type of building, saving money and space. Widths starting at 10’ up to 98’ and up to 19’11” high.
 
Horton Stack Door is the most versatile, unique, and economical wide-area door on the market today. Horton, Inc. is devoted to producing the best door on the market with special emphasis given to quality, ease of operation and customer service.