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  Whether you are a home or office user, we suggest that you look for the best air purifier to meet your needs. Maintaining your indoor air quality is essential if you want to stay away from a lot of common respiratory infections and diseases. Read on to find out more. 1. Maintenance Cost With proper maintenance, your air purifiers will continue to work properly for years to come. Before you purchase a device, we suggest that you follow some cleaning and maintenance tips. After all, you don't want to end up spending a lot of money on the units. 2. Filter Replacement If you have plans to invest in a HEPA air purifier, don't forget to find out about the replacement cost of these filters. Based on the usage and air quality in your house, the lifespan of these filters may be short or long. Generally, they don't last more than 2000 hours. Apart from this, you must replace the filters after a period of 7 months. The LED on the unit may also turn on to indicate that a filter needs