Custom Wrapped Box EvaporatorsCustom wrapped boxes are ideal for use where a clean box interior is necessary, although almost any refrigeration application can be built. Using the wrapped box as bait freezers or catch boxes helps keep the items from freezing to the evaporator surface, and aids in cleaning of the box. The fiberglass box is wrapped with copper tubing and pre-charged with R-134A at the factory. A special heat transfer compound is used to help heat transfer from the box to the tubing. All boxes are supplied with quick connect fittings to speed installation.