Mason, OH – Clopay® Corporation, a leader in closure products for commercial, residential, industrial, institutional, and retail applications, introduces its next-generation Thermiser Max® - Low U Insulated Rolling Door. With a U-factor rating of 0.532, the Thermiser Max - Low U Door is one of the most energy efficient rolling doors on the market and has been validated by third-party testing using the door industry’s most accurate measure of thermal performance.