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This air purifier features contemporary ultra slim design, and is virtually silent at low setting. High efficiency HEPA-type filter reduces pollen, tobacco smoke and odors, and can last up to two years under normal operating conditions. It also has a convenient auto shut-off timer that automatically shuts off the air purifier after 2 hours. It's not just slim, it's UltraSlim -just over 5-in. thick and 16.5-in. high x 16.5-in. long.