The 591 Series is one of the best-selling doors in the Thermacore^® line, and offers superior thermal efficiency to fit a broad range of applications. The 591 Series exterior skin is constructed of galvanised steel with a ribbed, textured finish. It is available with a white interior finish and choice of white, industrial brown, tan or gray exterior.

When your project requires a sectional door with an exceptional degree of thermal efficiency, the Thermacore^® Sectional Steel Door Model 591is 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. 

This 1 5/8” (41 mm) thick, heavy duty door fits a wide range of opening sizes and the spectrum of applications — making it the best-selling door system in the Thermacore^® line and one of the most-specified insulated sectional doors in the industry. Boasting an R-value of 14.86 (2.63 W/m²), a U-value of .067 (.380 m²/W), and one of the best air infiltration ratings, the Thermacore^® 591 will meet or exceed almost any thermally efficient application requirement.