FIG. 1 is a front elevation view of an air heater showing my new design;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is an A—A cross section view of FIG. 6;
FIG. 8 is a perspective view thereof;
FIG. 9 is an enlarged view of FIG. 5;
FIG. 10 is a rear elevation view showing another embodiment of my new design;
FIG. 11 is a left side elevation view thereof;
FIG. 12 is a right side elevation view thereof;
FIG. 13 is a top plan view thereof;
FIG. 14 is a bottom plan view thereof
FIG. 15 is an A—A cross section view of FIG. 14;
FIG. 16 is an perspective view thereof; and,
FIG. 17 is an enlarged view of FIG. 13.