Replaceable air filter
FIG. 1 is a perspective view of the bottom of the replaceable air filter; 
     FIG. 2 is a perspective view of the top thereof; 
     FIG. 3 is a bottom plan view thereof; 
     FIGS. 4 and 5 are edge views thereof; (all edges are similar) 
     FIG. 6 is a top plan view thereof; and 
     FIG. 5 is a left side view thereof; the other side is a mirror image.