The ornamental design for a flow blocking shadowframesupport, as shown and described.
FIG. 1 is a front and top perspective of a flow blocking shadow frame support showing our new design, with a portion omitted to show the ends in sufficient detail;
FIG. 2 is an enlarged fragmental back and top perspective view thereof;
FIG. 3 is a side elevation view thereof, the opposite side being a mirror image;
FIG. 4 is a rear elevation view thereof, with one enlarged section shown for ease of illustration;
FIG. 5 is a top plan view thereof, with one enlarged section shown for ease of illustration;
FIG. 6 is a front elevation view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in FIGS. 1-2 represent indeterminate width. The broken lines in FIGS. 4-5 represent unclaimed subject matter and form no part of the claimed design.