This sign is a double-sided plough (wing) design, mounted at a right angle to the wall so it is visible from both directions along a corridor, marking the location of a manual fire alarm call point. It is photoluminescent (Class D, ISO 17398/16069), meaning it absorbs and stores light from normal room lighting and continues to glow in the dark if the power fails. At 150 x 150 mm, the sign gives a viewing distance of 15 metres. It is made of aluminium with silk-screen printing and a protective lacquer finish, in accordance with ISO 7010, DIN 67510 and NS 3926.
