FIG. 1 is a front perspective view of an air purifier showing my new design according to a first embodiment;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view of thereof;
FIG. 8 is a bottom plan view of thereof;
FIG. 9 is a front perspective view of an air purifier showing my new design according to a second embodiment;
FIG. 10 is a rear perspective view of FIG. 9;
FIG. 11 is a front elevational view of FIG. 9;
FIG. 12 is a rear elevational view of FIG. 9;
FIG. 13 is a left side elevational view of FIG. 9;
FIG. 14 is a right side elevational view of FIG. 9;
FIG. 15 is a top plan view of FIG. 9;
FIG. 16 is a bottom plan view of FIG. 9;
FIG. 17 is a front perspective view of an air purifier showing my new design according to a third embodiment;
FIG. 18 is a rear perspective view of FIG. 17;
FIG. 19 is a front elevational view of FIG. 17;
FIG. 20 is a rear elevational view of FIG. 17;
FIG. 21 is a left side elevational view of FIG. 17;
FIG. 22 is a right side elevational view of FIG. 17;
FIG. 23 is a top plan view of FIG. 17;
FIG. 24 is a bottom plan view of FIG. 17;
FIG. 25 is a front perspective view of an air purifier showing my new design according to a fourth embodiment;
FIG. 26 is a rear perspective view of FIG. 25;
FIG. 27 is a front elevational view of FIG. 25;
FIG. 28 is a rear elevational view of FIG. 25;
FIG. 29 is a left side elevational view of FIG. 25;
FIG. 30 is a right side elevational view of FIG. 25;
FIG. 31 is a top plan view of FIG. 25; and,
FIG. 32 is a bottom plan view of FIG. 25.
The broken lines in the drawings illustrate the portions of the air purifier which form no part of the claimed design.