The protective vent plugs (or protect vent plug) are ventilation accessories for closed enclosures. They allow water vapor molecules to diffuse through microporous membranes while preventing the ingress of water, dust and other contaminants thus constituting pressure equalisation, reducing condensation and enhancing equipment safety and reliability. The vent plugs have applications in many extreme environmental conditions including outdoor electronic equipment, industrial and power & electronics. Independent labs test all protective vent plugs and certify them to multiple IEC, UL and DIN test standards that ensure durability and resistance in extreme environments.