line 2 2 in fig1 the barrier plate 18 is shown to be an upstanding portion of a threshold frame member 40 which forms a lower portion of the doorframe 16 the sliding door 12 is movably mounted on an inner rail 42 of the threshold frame member 40 by means of a number of rollers 44 while the stationary door 14 rests on an outer rail 46 of the threshold frame member 40 the compression panel subassembly 28 includes a panel mounting bracket 50 attached to the sliding door 12 by the screws 30 a decorative cover 52 fastened to the panel mounting bracket 50 by means of a number of screws 54 and a compression panel 56 slidably mounted on the panel mounting bracket 50 by means of a number of shoulder screws 58 each of the shoulder screws 58 which is attached to the compression panel 56 by threads 60 includes a shoulder 62 sliding within a hole 64 in the panel mounting bracket 50 in this way the compression panel 56 is mounted to move in and opposite the engagement direction of arrow 66 with a number of compression springs 68 pushing the compression panel 56 in the direction opposite arrow 66 through the shoulder screws 58 the upper surface of the compression panel 56 is as high as the upper surface of the barrier plate 18 fig3 is a fragmentary cross sectional plan view of the door assembly 10 taken as indicated by section line 3 3 in fig2 while fig1 and 2 show the sliding door 12 partly open fig3 shows the sliding door 12 fully closed referring to fig2 and.