Abstract: Filters and filtering methods for placement in an electronic enclosure, such as a hard disk drive housing, are disclosed. In one embodiment the filter includes a housing having a top, a base, and at least one sidewall extending from the top to the base, the housing defining an inlet port and an outlet port through the sidewall, and a breather port in the base, the housing further defining an internal volume. Adsorbent filter media is disposed within the internal volume of the housing such that the housing defines a first path for flow of fluid through the breather port in the base to the filter media and a second path for flow of fluid through the inlet port, into contact with the filter media, and out the outlet port.

Abstract: Filter assemblies that manage the movement of gases and water to and from the anode and cathode of fuel cells. The assemblies are particularly suited for methanol and other liquid fuel sources for portable hydrogen fuel cells. These fuel cells and filter elements can be used with equipment such as telephones, personal computing devices, lap top computers, and pagers. The invention provides a filter assembly that forms a selectively permeable barrier between the exterior of the fuel cell and the cathode. The filter assembly manages the exposure of the cathode to particulate and gaseous materials. The filter assembly can also manage the movement of water. The invention also provides a filter assembly that forms a selectively permeable barrier between liquid (e.g., methanol and water) and the exterior of the fuel cell. The filter assembly manages the movement of liquids and gaseous materials away from the anode.