FUN function: features and specifics of ventilation

Purpose and functional features of the FAN mode in an air conditioner

Purpose and activation of ventilation mode

The ventilation mode (designated as FAN, SPEED, FAN SPEED, or FAN ONLY) in an air conditioner is designed for circulating air in the room without cooling or heating it. When this mode is activated, only the indoor unit fan operates, while the compressor remains switched off.

On the remote control, this mode is usually indicated by a fan icon . It is used to create airflow within the room, helping to eliminate stagnant air and improve the overall indoor climate.

Operating principle of FAN / FAN ONLY mode

When FAN mode is activated, the indoor unit fan starts operating, while the compressor remains inactive. Air passes through filters, where it is cleaned of mechanical contaminants. If the device is equipped with additional filters such as carbon, photocatalytic, or electrostatic filters, it also provides extra purification from bacteria and microorganisms.

The ventilation mode does not provide an inflow of outside air. Air circulates exclusively within the room. This mode does not replace airing the room; therefore, it is recommended to open windows regularly to allow fresh air in.

Adjusting fan speed

The fan speed is adjusted using the FAN or SPEED button on the remote control. Each press switches the speed in the following order: low, medium, high. An automatic mode may also be available, in which the device selects the speed based on the room temperature.

Some models allow more precise fan speed adjustment using additional buttons. In AUTO mode, the speed is set automatically depending on the difference between the set and actual room temperatures.

In DRY and CLEAN modes, fan speed adjustment is usually unavailable. In CLEAN mode, the fan operates at a low speed to blow through the evaporator.

Fan speed modes

Different fan speed modes provide flexibility in climate control:

• Low speed — used at night or when minimal noise levels are required.
• Medium speed — suitable for daily use and even air distribution.
• High/Turbo speed — used for rapid air refreshment or accelerated mixing of air masses.
• Automatic speed — the fan adjusts its intensity automatically depending on room conditions.

Advantages and limitations of ventilation mode

Using the ventilation mode improves air circulation, prevents stagnation, reduces the concentration of carbon dioxide and other pollutants, and can enhance even temperature distribution, especially when combined with cooling or heating modes.

However, FAN mode does not replace proper ventilation since it does not supply fresh outdoor air. For effective air exchange, it is recommended to ventilate the room at least once every 2–3 hours for 15–20 minutes.

Adjusting the direction of airflow

For more efficient ventilation, the direction of airflow can be adjusted. This is done using the Swing or Air Flow buttons on the remote control or via an application.

• The swing function (horizontal or vertical) ensures even air distribution throughout the room.
• A fixed position allows directing airflow to a specific area of the room.

Conclusion

The FAN ventilation mode in air conditioners serves as an important addition to the main cooling and heating functions, improving air circulation and purification. Its use is especially relevant during the off-season or in conditions where there is no need to change the air temperature. When properly adjusted and combined with regular ventilation recommendations, FAN mode helps maintain a comfortable and healthy indoor climate in both residential and work spaces.

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