Window fan with screen covering

A window fan system, comprising:

• a housing unit having a front panel and a rear panel, said front panel and said rear panel having grilles;
• a fan disposed between said front panel and said rear panel;
• a covering configurable in an installed state and a stored state, wherein said covering covers a grille on said front panel or said rear panel in the installed state and said grille on said front panel or said rear panel is not covered by said covering in the stored state;
• a plurality of fasteners, each including a first fastening member on said housing unit and a second fastening member on said covering designed to connect with said first fastening member at least in the installed state,
• a holder supporting said covering on the housing unit when said covering is in the stored state, said holder selected from the group consisting of at least one of said plurality of fasteners, a storage fastener that is different from said plurality of fasteners, and a retainer.