The fan continues to run for a few minutes after operation has ended, in order to dry the heat exchanger in the indoor unit. This eliminates unpleasant odors. Indoor units for the home impress with an additional – virtually passive – cleaning function: special profiles & coatings on the heat exchanger fins make it easier to wash away stubborn contaminants filtered out of the air using condensation produced during cooling mode – a clever & hygienic solution.
TOSHIBA systems also work to provide a healthy environment in places that you perhaps would not expect, e.g. antibacterial glass in drain pumps integrated in some indoor units. This glass produces silver ions that block the metabolic activity of bacteria and destroy their ability to replicate, leading ultimately to their death. The effect of this is permanent, so the system remains maintenance-free.