No. 904 has a vertical conveyor and provides a maximum relative humidity of 90 percent at 100oF (38oC). Fourteen stainless steel trays are supported at each side by a heavy-duty stainless steel roller chain driven by 0.5 hp motor. A 600-cfm recirculating blower provides vertical upward airflow to the workload as it travels through the chamber. Self-contained humidifier with 30 lb/hr capacity is onboard.