gap 380 between the door 32 and the z bar assembly 36 fig2 c particularly when the guard assembly 352 extends over an appreciable length of the vertical edge 373 of the door 32 the guard assembly 352 may be utilized without the z bar extension member 40 as depicted in fig2 a through 26c or in conjunction with the z bar extension member 40 to provide the additional barrier characteristics outlined above the guard assembly 352 may be fabricated from a resilient material such as metal or high density plastic or from a more compliant material such as a rubber or silicone or from a combination of resilient and compliant materials additionally the shield portion 370 may be fitted with weather stripping or other suitable material to provide further insulative characteristics to the door assembly 30 and to compensate for dimensional intolerances that may occur in fabrication and installation in another embodiment the shield portion 370 may be connected to the base portion 354 of the guard assembly 352 through a hinge portion not depicted the hinge portion may be a separate member such as a spring loaded pivot pin that connects the base and shield portions 354 and 370 or a living hinge that is integral to the base and shield portions 354 and 370 or by other hinging techniques known to the artisan the hinge concept can provide compliance between the shield portion 370 and the z bar 38.