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Blog Title: Black ring around the outlet vent of an HRV…is something to be alarmed about?

Main Que: Black ring around the outlet vent of an HRV…is something to be alarmed about?

  • Category:
  • Query By: Adam Carter (Austin, TX)
  • Date: 08/06/2016

Answer: 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.

  • Replied By: John Allen (St. Louis, MO)
  • Replied Date: 08/07/2016