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Portable True HEPA Air Purifier Quiet, efficient, safe and easy to use, the portable air purifier helps you clean the air in your classroom for a healthier environment.   • Removes common allergens from the air (dust, pollen, mold, bacteria) • Four casters • Indicator to prompt filter replacement • Four fan speeds • Child safety lock • Dual HEPA filters (filter lifetime is 1600 hours or approximately 1 year of use in a school setting) • The dual true HEPA filters capture at least 99.97% of particles measuring 0.3 microns • In a typical classroom of 750 sq ft that gets 1.5 air changes per hour (ACH) from existing ventilation systems, adding our air purifier will increase the ACH to 5.2 • The clean air delivery rate (CADR) is 365 cubic feet per minute (CFM) which means every minute, 365 cubic feet of air is purified • Approximately 44dB (normal conversation noise level) at 6 ½ ft from unit • Timer • ETL listed to UL 507 standard • 1 year warranty on the air purifier   Outer measurements Height: 22" (71 cm) Width: 18" (46 cm) Depth: 10.5" (27 cm)