Outdoor air conditioner cover for window air conditioner units. Helps protect expensive units from damage caused by rain, snow, and sleet. Reduces uncomfortable drafts and heat loss. Made of heavy-gauge plasticized fabric that will not crack or mildew. Elasticized for a tight secure fit. No. AC2HDI: 18'' H. x 27'' W. x 16'' D. x 6 mil., fits up to 10,000 BTU units No. AC3HDI: 18'' H. x 27'' W. x 22'' D. x 6 mil., fits 10,000 to 15,000 BTU units No. AC5HDI: 20'' H. x 28'' W. x 30'' D. x 6 mil., fits 15,000 BTU units and up