The trusty and top-rated T500 delivers impressive True HEPA (H13) purifying power in a space-saving design. Quieter than comparable tower units, the T500 cleans up to 500 sq. ft. of air every 30 minutes. Thanks to Alen®’s medical-grade filtration, it efficiently captures up to 99.9% of dust, allergens, and pollutants particles down to 0.1 microns.