I originally purchased a smaller unit, there are no smokers in my house, no allergies, just wanted fresher air from like cooking odors etc. smaller one seemed to shake when on high speed and didn’t handle the odors. Went to the 75i which should handle the room it is in, even though air does seem fresher, I still have the lingering odors from cooking. Not sure what to do, if someone has a suggestion for me I would appreciate it.