ghdprentice-
I can appreciate your comments and it makes me want to ask “how low is the typical noise floor in your listening environment? I would think very low if the effects of an air cleaner made a difference from that distance.
I fight this myself since putting my equipment into a small room. The equipment (tubes) can quickly raise the temperature in this space by over 10 degrees and demands the use of air conditioning for listening periods of over an hour.
This room (when using a db meter phone app) sits at 25db with just the equipment running. That will jump to 45 with the A/C on. The airflow definitely has an effect on how I hear the music- but sometimes it becomes unbearable without it!
BTW- I like your system! A very nice setup- our systems have some similarities as we are both AR users.