Size: These adjustable Ac Replacement Side Panels measure 11.5x12.7" to ensure a perfect fit with most window air conditioning units. Please check the size of the window frame and the size of the air conditioner before purchasing. Plastic construction: Window Air Conditioner Side Panels are made of plastic that stands up to regular use and exposure to the elements. They provide long-lasting performance and protection for window air conditioners. Dust protection: The use of these dust-proof Ac Side Panels effectively prevents dust and other particles from entering the room, contributing to a healthier living environment and prolonging the life of your air conditioner. Easy to install: Window Ac Side Panels are telescopic and adjustable, sliding to fit the size and mounting location of your air conditioner. They are also easy to remove for cleaning, ensuring that they remain efficient and aesthetically pleasing throughout their use. Insulation and noise reduction: Ac Side Panels provide excellent insulation to help maintain the ideal indoor temperature. They also greatly reduce noise from outside, ensuring a quieter, more peaceful environment.