This Fellowes air purifier's got a HEPA H13 filter that catches tiny particles like smoke, dust and pollen, so your home will always feel fresh and clean. You can choose between 3 speed settings depending on your needs or simply set it to automatic mode and let it do its thing. The 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 68.5 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 602 m³/hour, it works on rooms as big as 60 m² in just 15 minutes - Use the sleep mode and it will work extra quietly while you take a nap