Dust reaches a room before anyone opens the door
Equipment rooms draw air, and the air they draw comes from the corridor outside. Dust generated in that corridor, or tracked to the door on footwear, ends up inside regardless of how carefully the door is managed. That makes the approach the highest-value area to keep clean, and it is the part most often treated as ordinary circulation space.
A stated higher frequency for the corridor approach, with attention to floor edges where dust accumulates and to the threshold itself, does more for the room than an occasional internal clean. Matting at the approach helps where the corridor connects to a less controlled area. None of this requires entering the room or touching anything within it. Recording the corridor approach as a distinct item, with its own frequency, is what separates it from general circulation in the delivered service.
