Architectural Wood, Windows, and Doors. The first truly custom window and door company in the US, family owned Zeluck draws on international expertise to stay on the cutting edge of advances in manufacturing and technology. For nearly a century, Zeluck has been serving the architectural community and discerning clients with fully customized and tested products. Zeluck’s unyielding search for excellence knows no boundaries and that has led to a sophisticated fusion of engineering, design, fabrication and service.