Dry air is passed through the McDry MCU-401 hepa filter, circulated throughout the cabinet and back into the drying unit using a fan circulation system. The cabinet’s relative humidity is kept below 10% and can hold up to 50 kg. The hepa filter system is equipped with a digital meter which displays the RH level at all times. The McDry MCU-401 hepa filter also features adjustable stainless shelves and a high resistance ground terminal.