It really is possible to extract various gasses from the air. Air Liquide has been doing it for decades. Let me say, tho, that I doubt a refrigerator sized machine can do so with any sort of economy. The various metals and salts, pumps and filters would cost more than they could ever pull out before needing to be replaced/replenished.
BUT...this is truly viable for clean water anywhere on earth (except maybe the poles):
https://source.co/pages/residential