R-DRY BVL is designed for operating requirements in tropical and subtropical environmental conditions. Under these conditions, cooling with fresh air is not possible. The special feature of BVL models is closed circuit cooling. A water-cooled heat exchanger cools the air stream, which is heated by releasing moisture by the drying agent. A water-cooled heat exchanger cools the air stream, which is heated by releasing moisture by the drying agent. The cooling air is directed back into the blower suction hole from here. With this model, which is suitable for climate zones all over the world, it is possible to reach dew point temperatures of -70 ° C.