Embodiments of the invention provide a device with a metal gate, a high-k gate dielectric layer and reduced oxidation of a substrate beneath the high-k gate dielectric layer. The system includes a central HVAC air handling unit containing first and second duct works for receiving and transmitting conditioned air to rooms of the facility. The lattice includes lattice openings with lateral walls covered by a spacer made of a second material. Also, a method and antenna for receiving millimeter wave radiation are disclosed. Thus, the time during which the electromagnetic lock operates with the full supply of the electric power is minimized, limiting the total power consumption accordingly.