The ornamental design for an airfilterunit for use in respirators, as shown and described.
FIG. 1 is a top front perspective view of a preferred embodiment of the air
filter unit for use in respirators;
FIG. 2 is a top plan view thereof;
FIG. 3 is a left side elevational view thereof, the right side being a
mirror image of that shown; and,
FIG. 4 is a bottom plan view.
The pattern of holes has been partially shown in FIGS. 1 and 3 for ease of
illustration, it being understood that the broken lines indicate that said
pattern of holes is continuous throughout the areas represented.