Dehumidification reduces the moisture content in indoor air.

The air supply air conditioning refrigeration system does not work, only the fan of the indoor unit runs, so that the air circulates indoors.

Fresh is to exchange outdoor air for indoor air to keep indoor air at a certain oxygen content, or to increase the negative ion content of indoor air with negative ion generator to increase indoor comfort.

Someone is smoking in the air-conditioned room. When the smoke smell is very strong, you can light a candle and use the activated carbon generated when the candle burns to absorb the smoke smell. However, this method is only a stopgap measure. Carbon dioxide and smoke produced when candles burn are also harmful to human body. It is best to discourage them from smoking.