The Glasfloss PSR24201 24 x 20' x 1 Glasfloss Polyester Service Roll is a high-quality product designed for use in heating, cooling, and air systems. Made by the reputable brand Glasfloss, this service roll is specifically designed to provide reliable filtration for HVAC systems. With dimensions of 24 x 20' x 1, this product offers a large surface area for efficient filtration and maintenance of clean air in your home or office space.