Is it possible to install an additional filter into LG wall mounted air conditioner? If it is possible, then which one?

Is it possible to install an additional filter into LG wall mounted air conditioner? If it is possible, then which one?

Answer: There are "plasma" and catalytic filters in LG air conditioners, starting with Neo Plasma series. So there is special space for built-in filters. If homemade filtering system is installed additionally, there may be a probability of "wrong" airflow. The air will stay too long, spread over an air conditioner, i.e. conditioning and air cleaning become pointless.