National Marker Company Sign with DANGER - BOILER ROOM AUTHORIZED PERSONNEL ONLY Signage keeps the people aware about the entry restriction in the Boiler Room that can be dangerous. This helps keeping a check on the security around the Boiler Room. This boiler room danger sign has text written with bold and vivid colors. The text is legible from most of the viewing angles and even from a distance also. The lightweight material allows placing of this sign across the lobbies and near the boiler room. The crystal-clear coating of this signage protects the sign from extreme weather conditions and UV radiations.