It was the unique requirements of customers that led to the development of these portable designs that are actually constructed on a portable "skid." Product is loaded into a holding room, with a large roll-down door. Then the System is placed in the doorway and the door closes into the center of the system. To prevent cold air leakage, insulation material is used to temporarily fill the small gap that is created between the door and the floor.

This design is available in Central Airflow and Up Airflow configurations.