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Pressure differentials in a hermetically sealed enclosure are a result of the heat generated by elelctrical and electronic components in the enclosure, as well as the fluctuation of the outside temperature. In the case of negative pressure or vacuum, for example, dust and humidity can be absorbed through the door seal and can enter the enclosure.

The DA 284 Pressure Compensation Plug provides a protected enclosure environment for valuable and crucial components with a high degree of protection at the same time. A semipermeable membrane inside the plug allows air to leave the enclosure, In the opoosite direction, it only allows dry air into the enclosure while not allowing humidity and dust from the outside to enter. This product is CE, UL Recognized and RoHS compliant.