In most honeycomb dehumidifiers, the rotor rotates slowly between a large sector for the process air and a smaller sector for reactivation air. Reactivation air is a hot airstream that releases the water from the honeycomb, and carries it out from the rotor. The two airstreams are kept apart by seals against the flat ends of the rotor cylinder and ducting inside and outside of the dehumidifier. The dry air is blown into the area to be dehumidified and wet reactivation air is exhausted to the outside. By the rotation of the rotor, the process is continuous, so dry air is always produced.

The reactivation air is passing through a heater, powered by electricity, hot steam or gas.

Before entering the rotor, the air is typically 80 to 140 °C. After leaving the rotor, it has cooled down but picked up the moisture adsorbed by the desiccant from the process air.

Active dehumidification is used, for instance in manufacturing of electronics, pharmaceuticals, food and candy, laminated glass, plastic bottles and lithium batteries. It is also applied for protection of several products in storage like steel, explosives, textile and leather. Most ice-rinks use active dehumidification to avoid fog, condensation and frost like domestic houses in certain areas to protect the crawl-space from mold and mildew.

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