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The current design has a small opening that is intended to recirculate filtered air back into the enclosure with the majority of the filtered air going overboard (Outside the Enclosure). In some situations that require high ambient temperatures (e.g. ABS) too much air may be exhausted out of the enclosure and cause the ambient internal enclosure temperature to drop too much. In these cases the Restrictor is designed to fit on the Exhaust Tube and reduce the amount of filtered air going overboard.