I have multiple air purifiers in my house because we live in a fire prone area and each year brings wild fires.  The ash and smoke in the air is so unhealthy.  Plus, the high winds and strong spring rain season brought up a lot of pollen in the air.  These external pollutants mixed with cooking smells is why I use air purifiers.  Shark NeverChange Air Purifier is strong and provides us clean air to breathe. Easy set up, easy and understandable display and stats. Not too loud and the advantage and convenience of not having to replace filters for several years (just wash the filters provided until replacement is needed) is just wonderful.  This is my NEW FAVORITE AIR PURIFIER. Plus, it's beautiful to look at. Shark products have always been of high standard and quality and this one does NOT disappoint.