Produced to IMO specifications, the green luminescent Yfestos pictograms were installed onboard the Finnish patrol vessel Telkka. Constructed by Uudenkaupungin Tyovene oy, the vessel is the first to be equipped with luminescent and temperature-resistant Yfestos pictograms.
Manufactured to indicated escape routes, the advised direction to walk and rescue equipment
, the pictograms are either screen-printed on aluminum or screen-printed stickers. If a fire should occur, the density of the fumes will make it virtually impossible to see illuminated emergency exit signs, which are generally situated above doorways. In order to better assess an emergency situation, Yfestos markings are positioned at an appropriate height effectively marking a safe way to exit.