Abstract: A method of treating an air stream that is contaminated with organic substances, comprising irradiating the contaminated air stream with UV-light emitted from UV-lamps, wherein the UV-lamps have a given length of life (T1) which is determined by the decrease of the set UV-radiation in accordance with a first function (F1) from a starting state when setting the method into operation (E1) to a smallest theoretically acceptable value (E2). The UV-lamps shall be cleaned at a time interval (T2) that is determined by the reduction of the actual set radiation to a smallest desired value (E3). The lamps are cleaned at time intervals (T2) calculated with the aid of—the value of the UV-radiation at the initial starting state (E1),—the value of the smallest desired actual UV-radiation (E3),—the first function (F1) for reduction of the UV-radiation during the working period (T); and—a second function (F2) for reducing the UV-radiation due to dirtying of the UV-lamps.

Abstract: A thermally insulated container is provided, mainly intended for storing and transporting material such as vaccine, biological material or the like, which requires storing at a constant temperature during several months. The container comprises an outer and an inner vessel each of which is hermetically sealed and defining an outer and an inner space respectively. The material to be kept at said temperature is arranged in the inner space. A solid-to-liquid phase transforming material is arranged in the inner space completely surrounding said material. A composite insulation fills out the outer space and comprises layers of a porous material under vacuum alternating with layers of a heat reflecting material. The insulation encloses the inner vessel on all sides and the outer space is free from structural connections extending between the inner and outer vessels, so that thermal bridges between the inner and outer vessels are effectively prevented.