The ornamental design for an airdiffuserguard, as shown and described.
FIG. 1 is a front perspective view of an air diffuser guard showing my new
design;
FIG. 2 is an enlarged end elevational view thereof, the opposite end being
a mirror image;
FIG. 3 is a front elevational view thereof, with the center portion broken
away for ease of illustration, the rear elevational view being a mirror
image;
FIG. 4 is a top plan view thereof, with the center portion broken away for
ease of illustration; and,
FIG. 5 is a bottom plan view thereof, with the center portion broken away
for ease of illustration.