I experience dust around the vents – what is the cause?

Dust around vents is a well-known and common phenomenon referred to in technical terms as dust induction. The dust deposits originate from the dust present in the room air, not from the supply air delivered by the ventilation system. When the supply air meets the indoor air, differences in air velocity and temperature can cause dust particles in the room air to become statically charged. This makes the dust more likely to adhere to surfaces near the vent.

The extent of dust induction is influenced by factors such as temperature differences between the supply air and ceilings or walls, as well as the amount of dust in the indoor air. Conditions such as tobacco smoke, the use of candles, and generally high dust levels indoors can intensify the problem. Smaller temperature differences and reduced dust levels in the indoor air can help reduce dust deposits to some extent.