Great Insulation The window air conditioner side panels are made of excellent insulation material to ensure long-term use with windproof, dustproof, and heat-insulating. Effectively reduces noise and light, so you can enjoy a comfortable and tidy room. Size Details Window ac side panels with frame fits most 5,000 BTU window air conditioner units. And the size of the window side panel frame is 11-3/8 inches in width and 11-1/4 inches in height. Please check the size of your original frame or window ac units. Efficient Accessory The window ac side panels with frames are designed to prevent air leakage, keeping cool air in during the summer and warm air in during the winter, saving energy.