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25 Sq FtLength: 13 5/16"Outside Diameter: 4 15/16"Top Hole: 2 1/8" OpenBottom Hole: 2 1/8" OpenWorks in Dynamic Series IV DFM, DFML, and Dynamic Series II and IIIPleat Count: 106Unicel replacement filter grids are recognized as the best grid replacements in the industry. They have received numerous awards year after year for their performance and quality of products. We are an Authorized Unicel Dealer. An appropriate cleaning schedule will both help the performance of the filter and keep it from breaking for longer periods of time. However, it is not a permanent part and standard use will result in the need for a replacement. Make sure you go with the highest quality standard of replacement: Unicel.