The Rheem-Ruud RXHF-17 External Filter Rack is a versatile 17" filter rack that will increase the efficiency and lifetime of your HVAC system. This rack is designed for external installation and can take a variety of filter sizes, allowing you to tailor filtration to your exact requirements. Weighing only 8.6 pounds, it is both lightweight and sturdy delivering consistent performance... https://www.partshnc.com/rxhf-17-rheem-ruud-17--external-filter-rack