Cartridge filter for ELECTROLUX upright vacuum cleaners Air Speed ZAS 1000/A, 1010, 5200A, Powerglide Z 3276…3279AZ, 3281AZ, 3282AVZ, @ease Z 4236…4239AZ. The high grade of material used for the ELECTROLUX filters provides your vacuum cleaner with high airflow and strong suction power as well as a maximum dust retention and high filtration level. So your upright vacuum cleaner motor is protected from dust particles inside the dust container. We recommend you to change filters at least twice a year or when they become visibly soiled. The use of non genuine filters may affect the performance of your upright vacuum cleaner. This pack contains one cartridge filter. ELECTROLUX cartridge filter reference: EF 91B.