The Fellowes® AeraMax® Pro AM4S is the perfect floor standing air purifier for large shared spaces; delivering 3-5 air changes per hour (ACH) in 65-110m² shared spaces. Thanks to the power of EnviroSmart™ technology, AeraMax Pro is the only air purifier that automatically responds to occupancy and air quality levels. Proprietary and patented EnviroSmart™ technology uses an array of sensors to continuously monitor occupancy and room air quality and automatically adjusts to clean the air. The 4-stage H13 HEPA filtration system removes at least 99.95% of all airborne contaminants as small as 0.1 microns, including viruses and an antimicrobial HEPA treatment prevents bacteria growth on the filter and activated carbon filter reduces odours and VOCs. All Fellowes® AeraMax® Pro air purifiers were demonstrated through independent laboratory testing to be effective in reducing aerosolised airborne concentration of SARS-CoV-2 by over 99.99% through a single air pass test. The AM4S also comes with a 5-year limited warranty and access to top quality customer support to help with any queries you may have.