This Rheem air filtration unit is designed to provide a long-lasting solution for maintaining clean and healthy indoor air quality. Constructed from durable plastic, the filter is resistant to wear and tear, ensuring its longevity. It features a permanent design, eliminating the need for regular replacements and thus reducing maintenance efforts. The filter effectively traps dust, pollen, and other airborne particles, enhancing the performance of your HVAC (Heating, Ventilation, and Air Conditioning) system while improving overall indoor air quality. Its compatibility with various Rheem models offers versatility in usage. The dimensions of this filter are 21 inches in length, 21 inches in width, and 1 inch in thickness.