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The Winix Signature U300 True-HEPA Air Cleaner offers you superior air cleaning technology that traps 99.99% of unseen particles suspended in the air: dust, pollen, pet dander, smoke, mold spores, organic chemicals. The U300 is designed for optimal use in large rooms. Winix's U300 uses a Washable Pre-Filter that extends the life of your HEPA filter and reduces housekeeping, by capturing large particles like lint and hair. The pre-filter, cassette, and carbon filters are treated with CleanCel, an anti-microbial coating, which prevents the growth of odor causing organisms such as mold and bacteria. The 99.99% efficient True-HEPA Filter then captures the particles you can't see, including pet dander, smoke, pollen and mold spores. The air then passes through our Advanced Odor Control (AOC) Washable Activated Carbon filter that traps and absorbs the strongest household, cooking, and pet odors. Winix's own PlasmaWave Technology then safely breaks apart remaining odors, chemical vapors, and other pollutants, at the molecular level, offering you superior all-around air cleaning, without producing any harmful ozone. Auto Mode and Air Quality Sensors combine to deliver Set-and-Forget convenience and optimal performance, with 4 Fan Speeds, Sleep Mode, and a Remote Control the Signature Series U300 was designed with you in mind.