The Carrier OptiClean™ rolls easily into any room and plugs into a standard electrical outlet to quickly improve indoor air quality (IAQ) in schools, dental offices, hospitals, and other commercial facilities. Product Highlights 99.97% efficient, long-life HEPA filter removes particles as small as 0.3 microns Standard MERV 7 pre-filter Nominal Air Flow: Meets or exceeds the ASHRAE Standard 170: Ventilation of Health Care Facilities HEPA filter rack and sealing design meet air leakage requirement Comes with a heavy duty, yet quiet motor Vertical design for smaller footprint Portable and adaptable to nearly any appropriately-sized location Heavy-duty, lockable casters for easy transport Red lighted indicator to alert user when filters are overloaded Green on/off switch illuminates to verify when running