Note that, in Figure 17.6, the following statements apply.
† Air terminals are installed only when air conditioning or other equipment is not
shielded by any higher metallic element. In the case that there is no device or
any system at risk on the roof of the control room, the ELPS can be omitted.
† A lightning current will flow through the air terminals and the walls of the control
room, which will act as a Faraday cage.