The so-called bi-metallic effect occurs when there is a large difference in temperature between the inner and outer frame of a door (for example when there is intense sunlight). The outer frame expands and can cause distortion of the door and locking difficulties. The anti bi-metal allows the outer frame to expand without affecting the fit of the inner frame, which means that it will continue to function as normal. This addition comes pre-installed in our thermal profiles.
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