A system for mounting an object in an opening in a structural member that has opposing first and second surfaces, the system including a housing with an interior to house the object and receivable within the opening in the structural member, the housing having at least one bendable tab to bear against and support the housing on the first surface of the structural member, the housing further including at least one pair of openings, and a trim ring having an interior side and an opposing exterior side, the interior side having one tab shaped to engage an opening in the pair of openings, the trim ring further including at least a second tab sized and shaped to engage an opening in a second pair of openings in the housing and thereby hold the trim ring in place on the housing while bearing against the second surface of the structural member.