Why has the thermal resistance of hollow metal doors changed recently?

The R and U values have been updated as a result of a change to the ASTM testing methods of SDI 113 (Standard Practice for Determining the Steady State Thermal Transmittance of Steel Door and Frame Assemblies). In the previous test method only a portion of the door was tested, which does not reflect operable conditions of the door, frame and hardware. The new version of the standard tests the entire assembly, which represents real-world conditions. Architects should only use the numbers from the new thermal performance standard method.

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