Device and method for a dishwasher

A method of processing air in a dishwasher, the dishwasher comprising a washing chamber and a device, the device comprising a drying material comprising activated alumina and arranged in a bed, a heating element arranged in the bed, and a fan, the method comprising:

• circulating the air between the washing chamber and the device such that at least part of the air passes through the bed allowing the air to contact the drying material of said bed;
• withdrawing moisture from the air passing through the bed by means of the drying material, the air passing through the bed at a first mean flow rate;
• regenerating the drying material by heating the bed by means of the heating element and releasing at least part of the moisture to the air at a second mean flow rate;
• and
• altering, during the regeneration step, the fan speed such that the first mean flow rate is higher than the second mean flow rate, wherein the fan speed is substantially periodical such that the fan speed is altered between a first fan speed, being substantially the same as the fan speed during the withdrawal step, and a second fan speed, being zero.