The vent for the cold air return collects dust just like the tops of furniture, base boards, hard surface flooring. The vents for the air conditioner/heat that bring in the heat or cool air should not have dust due to the filter in the air handler if that filter is changed regularly--at least once every three to six months. If there is any dust in the house, the cold air return vent will have dust. We don't even have carpet anywhere in the house, nor do we have pets, but still have to dust regularly. We wonder where the dust comes from also.
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