Package of 2 Eureka micron WhirlWind cassette filters. One is used on the back of the cyclonic chamber of earlier Eureka WhirlWind uprights except model 6140. It should be changed every three months and brushed off more frequently. Each white filter measures 5.5" x 4" x 0.25".
Package of 2 Micron Filters #60696 that fit on the back of the cyclonic chamber plus 2 thick Micron Filters #39334 that fit below the cyclonic chamber on many earlier WhirlWind uprights. One of each is used at a time. They will not fit the Eureka WhirlWind model 6140. These filters should be changed every three months and brushed off more frequently. Each cyclonic chamber filter measures 5.5" x 4" x 0.25" and the filter below the chamber measures 4.75" x 4.125" x 0.4".