Genuine filters for ELECTROLUX vacuum cleaners Clario Z 1910, 1920, 1930, 1931, 1940, 1941, 1942, 1945 (old generation), 4X4 Z 4440, 4460. The round filter is placed behind the vacuum bag and protects your vacuum cleaner motor. The rectangular filter is placed at the exhaust of the cleaner to filter out the maximum amount of dust from the air leaving the cleaner. To ensure the best performance of your vacuum cleaner, replace filters at least twice a year or when you notice they are visibly soiled. The use of non genuine filters may adversely affect your vacuum cleaner performance. This kit contains one motor filter and one microfilter. Filter kit reference: EF 23.