Replacement Cartridge Filters EO4435 Environmental. Replacement Element for Part Number Environmental EO4435 Filter. 13.8" OD X 28" L, Open/Open 80/20 Blended FR sq ft media. Environmental is a registered trademark of the respective company. TDSF-10002224 Replacement Cartridge Filters EO4435 Environmental.Our Replacement filters Work As Good Or The Same As The OEM Filters. We guarantee their performance. Some of the filters are non stock items and cannot be returned. Please see our return policy.