Atmospheric air is compressed by the main blower and fed to a dehumidifier, where most of the moisture is removed by water cooling and refrigeration. The air then passes through a silica gel bed for deep dehumidification, ultimately producing dry air with a dew point of −60 °C. The flow rate of dry air (Nm³/h or kg/h) is regulated by the speed of the main blower, which is controlled in closed loop by an orifice flow meter and the blower's variable-frequency drive (VFD).   Features: The air-cooling finned heat exchanger uses SS304 stainless steel for both fins and tubes, delivering a service life far longer than that of conventional copper-tube/aluminum-fin construction.