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Blog Title: Black ring around the outlet vent of an HRV…is something to be alarmed about?
Black ring around the outlet vent of an HRV…is something to be alarmed about?
Category: Wall Air Conditioning Post By: Adam Carter (Austin, TX), 08/06/2016

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.

- John Allen (Alief, TX), 08/07/2016
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