The Frost King 34 in. x 34 in. x 30 in. square central air conditioner cover fits round or square units and helps keep your outdoor central air conditioner unit protected from the elements. It stops leaves and debris from getting inside the unit in the winter. It blocks snow and helps prevent rusting. It is made from heavy duty reinforced polyethylene and will not crack or mildew. Frost King 34-in W x 30-in H Central Air Conditioner Window Cover in Gray | CC32X