A dehumidifier for an electrical-equipment air intake has an outer housing wall and 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. One embodiment establishes a number of amplifier performance constraints. The bed liner also includes two opposing side walls which conform the truck bed side walls, and a third wall attached to the side walls near the front of the truck bed. The monitoring server may be configured to translate one or more parameters received from a client device into an interpreted monitoring script and a trigger that causes performance of the interpreted monitoring script. A time at which the second record characteristic updating step is performed is determined in relation to a print production schedule for the printed materials. The gateway adapter includes a PBX interface for communicating with the PBX system, a network interface for communicating with the packet switched network and an interoperation functional unit to effect manipulation on data received by the two interfaces to allow the PBX system and the packet switched network to interoperate.