Washing and humidifying the air is Tom"s specialty! Large rotating discs inside are designed to filter up to 50% of small to medium-sized particles out of the air, while at the same time boasting a humidifying capacity of max 3.5 gallon per day. If Tom should run out of water despite his sizeable 1/5 gallon tank, he will automatically shut off to reduce power consumption (although at 19 W he is already conservative.) Tom"s self-cleaning mode is unparalleled. There is no need for cumbersome disassembly. Simply turn on the "extra cleaning cycle:! Since Tom is a very thorough chap, his special pre-filters will also filter larger particles such as household dust and hair out of the air.