High Performance Doors | TNR Industrial Doors - TNR Doors - TNR Doors As part of the Hörmann Group of companies, Hörmann Canada is an ISO certified company that is the industry leader in the manufacturing of custom built high-performance industrial doors. Our dedicated As part of the Hörmann Group of companies, Hörmann Canada is an ISO certified company that is the industry leader in the manufacturing of custom built high-performance industrial doors. Our dedicated team of professionals has nearly two decades of experience in engineering, application problem solving and project management. We create door solutions in several industrial and commercial segments, including: heavy industry, mining, waste management, manufacturing, distribution, parking and cold storage.