Abstract: The invention relates to an apparatus for adjusting the humidity in an at least partially enclosed interior zone such as an interior of a motor vehicle or the like, comprising a device for introducing humid air into the interior zone through an air duct system until a desired humidity value has been reached in the interior zone. The invention relates to an arrangement for performing ageing tests on products exposed to natural weather conditions as well as to a method for artificially humidifying a test chamber exposed to the weather.

Abstract: An apparatus for increasing the atmospheric humidity of an outdoor weathering facility for test samples in a test area (1), with a graduating unit (2) for controlling the level of the atmospheric humidity in the test area (1) by discharging an evaporated amount of fluid and with a device (4) for measuring the level of the atmospheric humidity over time during a test period.

Abstract: An apparatus for increasing the atmospheric humidity of an outdoor weathering facility for test samples in a test area (1), with a graduating unit (2) for controlling the level of the atmospheric humidity in the test area (1) by discharging an evaporated amount of fluid and with a device (4) for measuring the level of the atmospheric humidity over time during a test period.