This European Standard specifies the requirements for Security Fog Devices connected to an I&HAS. It covers application and performance and also gives the necessary tests and trials to ensure efficiency and reliability of such obscuration devices. This European Standard also gives guidance on the criteria for design, installation, operation and maintenance of Security Fog Devices. A Security Fog Device is not considered to be a component of an I&HAS and no requirements are given relating to the security grade described in EN 50131-1.