This Fellowes air purifier's got a True HEPA filter that catches tiny particles like smoke, dust and pollen, so your home will always feel fresh and clean. To keep you breathing easy, it's packed with cool tech. Aera+ Mode increases 50% airflow to remove allergens, AeraSafe helps keep the filter safe from bacteria and AeraSmart Sensor monitors air quality in real time and automatically adjusts the fan speed - enjoy fresh air without lifting a finger. Good to know- With a noise level of only 30 dB(A), it won't get in the way of your peace and quiet - Keep tabs on air quality using its LED control panel - it also lets you know when it's time to change the filters - With a clean air delivery rate (CADR) of 139 m³/hour, it works on rooms as big as 8 m² in just 8 minutes