Thermiser Max® - Low U Insulated Rolling Door

Insulated Doors

Model Number: ESD40

Meet the next generation of climate control. Stepping up from our Thermiser Max®, the Thermiser Max® - Low U door delivers the ultimate in energy efficiency with the lowest tested U-factor rating among rolling steel doors.

Featuring an innovative CPVC backer and premium insulation, it boasts an independently verified assembly U-factor of 0.532—offering the market’s most precise thermal defense. Combined with patented perimeter seals and thermally broken guides, it minimizes heat transfer, drastically lowers utility costs, and easily meets 2021 IECC®, ASHRAE® 90.1, and California Title 24 standards. This elite model also provides outstanding acoustic insulation (up to 27 STC) and can be configured to withstand a 20 PSF operational wind load.

Dare to compare and add up your savings! Learn more by understanding U-factor or use our interactive tool to calculate your savings.

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Technical Notes

Acoustic Testing: All configurations are evaluated per ASTM E90, based on testing a complete, operable assembly.

Performance Variations: Added options (such as vision windows or pass doors) may impact final U-factor and STC performance. Contact the factory for details on specific configurations.

Usage

Materials & Finishes

Available Operators

Codes & Listings
  • ISO 9001:2008
  • LEED® Compliance
See Codes and Listings page for detailed information.