The compact Air-Dryr from Davis Instruments—suitable for protecting woodwork--uses heat and natural convection to warm and dry the air to prevent mold and corrosion; it has no unsightly dehumidifying bags or fan units requiring drainage. Intended for constant use, it plugs into 110/220 V power and dries damp air by heating it above the dew point, then releasing warmed air through the top vents. 510-732-9229, DavisNet.com.