W.L. Gore & Associates offers their PREVENT enclosure vents. The vents are comprised of a ePTFE membrane structure that allows an enclosure to "breathe" with changing temperature, preventing pressure differentials from building up that can damage seals and gaskets. The vents provide free passage of air or gasses, while excluding liquids and particulate contamination. The vents are available as a snap-in or screw-in assembly or as a membrane adhesive patch for easy installation.