Thank you for your question. This system features an Apple Catechin and Ion deodorizing filter. The air filter part no. is 9323340008. The Apple Catechin filter, which is contained in the fan coils, assists in removing spores and other microorganisms. The Ion deodorizing filter helps to decompose and filter out any odors. Fujitsu estimates that this Ion deodorizing filter can be have a life of up to 3 years if it is hand washed with water when the filter becomes dirty. For more assistance, please give us a call.