FIG. 1 ; is a front view of a door opener;

FIG. 2 ; is a top view of the door opener of FIG. 1;

FIG. 3 ; is a back view of the door opener of FIG. 1;

FIG. 4 is a left hand view of the door opener as viewed in FIG. 1; and,

FIG. 5 is a right hand end view of the door opener as viewed in FIG. 1.

The broken-line disclosure in the views is for illustrative purposes only and forms no part of the claimed design.