A stack of folded sheets comprises first and second groups of folded sheets. When the upper body of the apparatus which is opened and closed for the replacement of an ink cartridge is opened and then closed, the user is asked which colors of ink cartridges have been replaced, and then whether the cartridge has been replaced by a new ink cartridge. The first dielectric layer is operatively coupled to the circuit. The combined airflow of supply airflow and circulated airflow is conducted out of the supply air terminal device.