Patent ID: 8905384

Claim:
A room humidifier for use with a warm air register of the type used for supplying warm air to a room, said humidifier being readily portable and arranged to operate without an electrical supply, comprising: a casing having an air inlet adapted to be positioned over an opening of the register for receiving air flow from said register, said casing having an air outlet for directing the air flow from the casing, an air porous evaporative filter element in said casing positioned in the path of air flow when moving from said inlet to said outlet, and the filter element having an upper edge and a lower edge portion, an upper reservoir in the form of a main water tank at least partly located above the filter element and having water outlet means allowing water to drip from the tank onto the upper edge of the filter element, and a lower reservoir in the casing in the form of a water pan surrounding the lower edge portion of said filter element and arranged both for receiving water which drips from said filter element and for supplying water to said filter element by capillary action.