At the heart of every air purifier is an air filtration system that ensures your air purifier maintains top performance to deliver refreshing, clean air throughout your home. However, a clogged filter could slow down the cleaning process, weaken the purification efficiency, and may result in worse air quality. Therefore, air filters need to be replaced periodically to maintain their efficiency and function. Typically, every model of air purifier has a specific air filter. Confirm the model of your air purifiers and make sure the filter replacement is compatible with your air purifier before your purchase.