I use these on my bagless handheld vacuum which is suitable for pet hair and am pleased with how clean they keep the motor/fan assembly and durability without having to clean or change the filter. I keep an extra 3 so that when my vacuum cleaner indicates a filter needs replacing I can do it right away and put the dirty filter in the sink with dish soap to clean it. This way I don't have to wait for the washed filter to dry before using it in the vacuum cleaner.