FAMIS: 26317
Using Vibration Sensors To Gauge Health Of HVAC Fans Site Wide
The MX fan1 seems to have some noise that comes and goes in increments of 10- 13 hours.

Both MR fan2 saw and increase in noise starting on the first of August and lasted for about 2 days.
MR2 Fan 6 _170 _1 saw an increase in noise on July 30th. that still persists.