HEPA cartridge filter fits Hoover bagless vacuum cleaners. This filter will fit Hoover Windtunnel & Windtunnel V2 models, Empower Models and Savvy Models that use  a cartridge filter. This filter is approx. 11 1/2 inches tall and 3 inches wide. Almost ALL vacuum cleaners have two very important filters that must be occasionally cleaned and/or replaced to prevent pre-mature motor failure. Many consumers use their vacuum week after week simply just dumping the dirt cup because they bought a vacuum that has "lifetime" or "washable" filters. If you want your vacuum cleaner to last years instead of months you MUST perform these easy-to-do steps that are very simple if performed frequently enough.   To work properly your vacuum cleaner must pull a large volume of air into the vacuum, filter and trap the dirt from the airflow and then exhaust the air back into your home. Even the finest or most expensive bag or cyclonic, whirlwind, or windtunnel type vacuum cleaner can't filter all the grit and fine dust from the large volume of fast moving air.