Fanless and filterless, it helps make no sounds and desires no maintenance, but you'll want to remember to clean from the ionized dust that builds up in close proximity to it to the wall. There are 2 filters included in the package, but there is an alternative to set up https://allhealthmarket.com/product/home-care-2/hydrogen-generator/hydrogen-inhalation-machine-300ml-450ml-hydrogen-water-generator-h2-inhaler-therapy-hydrogen-gas-generator-water-purifier-ionizer/