FIG. 1 is a front perspective view of an air purifier, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a front perspective view of the air purifier in FIG. 1 shown in an alternate configuration;
FIG. 9 is a front view of FIG. 8;
FIG. 10 is a rear view of FIG. 8;
FIG. 11 is a left-side view of FIG. 8;
FIG. 12 is a right-side view of FIG. 8;
FIG. 13 is a top plan view of FIG. 8;
FIG. 14 is a bottom plan view of FIG. 8;
FIG. 15 is an enlarged view of the encircled portion 15 in FIG. 1; and,
FIG. 16 is an enlarged view of the encircled portion 16 in FIG. 8.
The even-dash broken lines illustrating portions of the air purifier form no part of the claimed design. The dot-dash broken lines encircling enlargement portions of the air purifier form no part of the claimed design.