This filter captures microscopic particles from exhausting back into the air. The filter cartridge includes the plastic frame or tray already installed into the new one. Simply pull the tray out of your old vacuum and throw away. Replace entire tray with new filter already installed. Captures 99.97% of all airborne allergens as small as 0.3 microns. This filter fits the Following Hoover T-Series upright models; UH30300 UH70100 UH70105 UH70106 UH70107 UH70110 UH70212 UH70115 UH70116 UH70120 UH70130 UH70200 UH70205 As well as all other T-Series uprights beginning UH70###. Genuine Hoover Filter Part Number 303172002. Also replaces the older Hoover part number; 303172001.