A: It depends. Are you in a clean and controlled environment indoors? We are referring here to environments like a data center, in which case you want to schedule change-outs of your commercial air filters at least 3 – 4 times a year.
On the other hand, if you are in a harsh environment including outdoors or possibly active systems like those used in medical facilities, the frequency of change outs is a lot higher. Your commercial air filters would likely need to be monitored by maintenance sensors that indicate optimal operating parameters for temperature, pressure and air flow. And, when the filter falls outside those optimums, it is time to replace them.