When your project requires a door with an exceptional degree of thermal efficiency, the Thermacore®Model 591 is a proven performer. The Thermacore® steel-polyurethane-steel panel construction provides a thermal barrier that withstands extreme climatic conditions and the most demanding environmental requirements. The Model 591 door’s exterior skin is constructed of galvanized steel with a ribbed, textured finish. It is available with a white interior finish and choice of white, gray, tan or industrial brown exterior finish.