Furnace

FIG. 1 is a perspective view of a furnace showing my 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 an enlarged view of the encircled area 8 of FIG. 1 ;

FIG. 9 is an enlarged view of the encircled area 9 of FIG. 1 ;

FIG. 10 is an enlarged view of the encircled area 10 of FIG. 2 ;

FIG. 11 is an enlarged view of the encircled area 11 of FIG. 6 ;

FIG. 12 is an enlarged view of the encircled area 12 of FIG. 6 ;

FIG. 13 is an enlarged view of the encircled area 13 of FIG. 7 ; and,

FIG. 14 is an enlarged view of the encircled area 14 of FIG. 7 .

The showing of evenly broken lines is for illustrating portions of the article that form no part of the claimed design. The dot-dash lines depict the enlarged view boundaries that do not form part of the claimed design.