Exterior: Cold-rolled steel plate, interior aluminum alloy plate, insulated with fire-resistant material in between. There are rainproof natural ventilation windows on the top sides of the compartment. The bottom is covered with flame-retardant and static dissipative rubber board. Fixed loops are installed on the side of the compartment. Inside the compartment: Smoke sensor installed on the top, anti-theft device above the door frame, equipped with two fire extinguishers.
