The black dust may be due to deteriorating duct liner materials in your heater or air conditioner and in some cases your cold air returns.
Black dust on fan blades.
It may alternatively be due to soot produced from candles.
But they must understand that there is a lot of dust in the circulating air.
People often ask why spider webs and dust can be seen on the fans.
Over time a large volume of the circulating air hits and collects on the blades of the fan.
Soot deposition is most likely to occur on wall and ceiling surfaces in rooms where candles are burnt.
The air always has a great deal of dust in it larger particles that you can see and also microscopic ones.
I suggest you use each paper towel until it gets dark and starts smearing dust or until you move on to the next fan blade whichever comes first.
If the register is closed the air is forced along the ceiling and the next thing you know you ll start to see black buildup across your ceiling.
Once they re all dry apply your paste car wax.
Why do some fans have this buildup and other s don t.
Stand on a step stool or ladder to reach the fan blades.
Additionally fan blades move rapidly through the air rubbing and brushing against air molecules and pushing them out of the way.
Next you re going to make sure that each blade is dry.
You don t want to lather it on but make sure it reaches every part of every blade.