No it is not. As stale air in the room passes out of the vents it causes a static electric charge to build-up there. The charge attracts dust particles in the rooms which get accumulated there and looks like black rings. All you need to do about this is just wipe it with a moist cloth. Turning the diffuser plate of the vent open a little further can prevent this from happening.
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PREMAIRE PTAC UNIT PTW0723H3G 7000 btu 3.5kw
A/C Compressor,15500 BtuH,1-Ph,7.3
ComfortStar CARAT12-CA Diamond Series Mini Split Heat ...
1/185 HP Unit Bearing Motor, Shaded Pole, 1550 Namepla...