This pleated long-life HEPA cartridge filter fits inside the dust compartment in Hoover bagless uprights with a Twin Chamber System. Also refered to as as a Type 201 filter, 43611042 filter or 42611049 filter. Also replaces filter #40140202. Approximately 11 3/4" x 3". Change every 3 to 6 months. Check the "Fits These Models" tab to see which models this filter works with. Don't see your model listed? Please call Customer Support for help with parts that fit your model.