RD series desiccant dehumidifiers work based on adsorption theory.

The moisture in the process air is adsorbed in the dehumidification sector of the desiccant rotor. As the desiccant adsorbs moisture, it is slowly rotated into the reactivation sector.

During reactivation, hot air passes through the desiccant rotor and removes moisture from the rotor. After reactivation, the rotor rotates back into the process air stream to begin adsorption again. Adsorption and reactivation take place continuously and simultaneously. Positive sealing between the two airstreams prevents the mixing of the two streams.