Patent ID: 7563310

Claim:
A dehumidifier for an electrical-equipment air intake, the dehumidifier comprising: an outer housing wall; a floor of a material with a high specific thermal conductivity downwardly closing the outer housing wall, having a downwardly tapering funnel-shaped inner surface formed with a central downwardly open port, and having a rounded edge where the surface meets the port; an inner air-permeable housing inside the outer housing wall; a moisture-absorbing mass in the inner housing, whereby air drawn in through the port can pass through the mass and then into a space between the inner and outer housings; a moisture sensor between the housings; a first heater in the mass; control means connected between the first heater and the sensor for energizing the first heater and cooking moisture out of the mass such that the moisture condenses on the floor and runs over the edge out through the port; and a filter insert in the port, whereby incoming air and outgoing moisture must pass through the filter insert; and a second heater in the insert and separate from the first heater.