The Finnshield internal wall serves as an active thermal mass, effectively utilizing space without occupying any room. Each element, with a width of 1200 mm, has the capacity to store approximately 2 kWh of energy. This heat accumulator receives energy through standard foils typically employed in ceiling heating systems, capable of reaching up to 150 W/m2. To transfer the heat energy from the inner element to the surface of each element, quiet axial fans are employed.
The control unit communicates via a Wi-Fi network and can access optimal charging and discharging values from the Finngrid server or be regulated by the local electric company.