35XT & 50XT Doors MegaTherm® Advanced Thermal Commercial Swing Doors Energy Saving Entrance System Architects seeking LEED certification can enhance a project's energy conservation by specifying YKK AP's high-performance MegaTherm XT thermal entrances. A Model 35XT Entrance has a U-factor of 0.52 (UCOG = 0.29). Testing has also been conducted with advanced glazing to achieve a U-factor of 0.44, proving exceptional performance for an architectural aluminum entrance. ® To save energy, all aspects of the doors are thermally broken by YKK AP's MegaTherm polymer, which separates the interior and exterior extrusions by more than 0.270 inches to reduce energy flow. Thermal entrances feature dual perimeter air seals for superior performance over standard entrances. ® Product Options & Features n 3-1/2" Medium Stile & 5" Wide Stile n Wide selection of hardware for hinges, locks, closers, mid-rails and bottom rails n Mechanically joined/welded door corners n Accepts 1" standard IGU as well as advanced 1-3/8" suspended film glazing