The Holmes HEPA Type Mini Tower Air Purifier (Holmes HAP412N-U) is a personal tower air purifier for small rooms up to about 120 square feet. It filters dust, dander, pollen, mold spores, smoke, fabric fibers, allergens, and other contaminants in your air. This Holmes Mini Tower HEPA Air Purifier is made to filter and clean the air in small rooms up to 120 square feet, making this home air cleaner unit ideal for small rooms, small offices, small bedrooms, nurseries, desktops, and other small spaces. This Holmes personal Mini Tower Air Purifier unit utilizes a HEPA filter to reduce up to 99.97% of microscopic particles as small as 2 microns.