Keep your built-in air conditioner securely in place with the Frigidaire Built-In Air Conditioner Wall Sleeve. Designed to slide into a cutout and hold your unit snugly in the wall, this sleeve provides a stable and sturdy support system to insulate against energy loss and keep moisture out. Durable construction ensures long-lasting performance for seamless integration and optimal performance. Easy to install and assemble, this sleeve ships flat and is the perfect companion for any built-in air conditioner up to 25" wide.