Outdoor Window AC Cover Air Conditioner Protects Window-style Air Conditioners From Dirt and Debris in the Off-Season Fits 18" Height" x 27" Width" x 16" Deep Fits Window AC Units Over 10,000 BTU's Elastic straps allows adjustment for a tight and custom fit Durable, Mildew and Crack Resistant All Season Protects window-style air conditioners from dirt and debris in the off-season