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.
We’ve been getting a lot of emails lately about a do-it-yourself air conditioner maintenance plan, so, per your request, here’s the plan. To be hone...
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As a homeowner, you know a time will come when you will have to replace your heating system. Though you may have an approximate estimation of when th...
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