Type: SF-AA 50 Also Known As: Charcoal Filter, Anti Odour Filter, Active Filter PLEASE NOTE: Check Your Model Number This Filter Fits Model Number.S4281. But Does Not Fit Model Numbers. S428 I & S428 I-2. Perfect if you have pets Comprises of super air clean filter and active charcoal cassette Contains a layer of active charcoal which retains odours originating from pet hair and dander Cassette absorbs odurs from the dustbag keeping your pet smells at bay Filter retains 99.95% of particles This filter has been designed with an indicator ‘TimeStrip®’ set to prompt you a year after it has been activated. This is when we advise that you look to change your filter in order to ensure that your vacuum cleaner is working at its optimum performance.