Holmes aer1 Tower HEPA Air Purifier with Air Ionizer and Visipure Air Filter Viewing Window (HAP9423-UHA) Brand New Open Box Never Used Excellent Condition The Holmes aer1 Tower Air Purifier with True HEPA Filter captures particles as small as 0.3 microns from air passing through the filter, and is 99.97% efficient in removing common household odors and allergens such as pollen, dust, mold, pet dander, and smoke. The optional ionizer also helps to ensures smaller particles are more easily captured, and helps tackle odors. You can see the particles being accumulated through the Visipure Air Filter Window, and this Holmes air purifier has a filter reminder, so you know when it's time to change the filter. The space-saving design easily fits in any corner of the room, leaving clean and crisp air all around your home. 99.97% EFFICIENT AT REMOVING ALLERGENS: True HEPA Air Purifier is 99.97% efficient in removing airborne allergens as small as 0.3 microns from air passing through the filter INCLUDES IONIZER: This Holmes air purifier features an optional air ionizer that helps to bind negative ions to airborne smoke, dust, and pollen to form larger particles that are more easily captured, helping to clean air more thoroughly and tackling odors SLIM DESIGN, IDEAL FOR MEDIUM ROOMS Recommended for use in medium-sized rooms up to 202 sq. ft., this space-saving air purifier has a slim design perfect for bedrooms, family rooms, or any living space 130 CADR: Air purifier provides a 130 CADR (Clean Air Delivery Rate) FILTER VIEWING WINDOW: Visipure filter viewing window allows you to see particles accumulate, helping remind you to replace your filter FILTER REMINDER: Filter reminder dial allows you to track filter life, and remind you when a replacement filter is needed CUSTOMIZABLE SETTINGS: 3 speed settings to help you keep your air clean and pure