PVC Safety Sign Know Your Fire Extinguisher 300x500mm. This sign details the different types of fire extinguishers and their applications. Using clear and concise text, universal colour coding and easily recognised symbols, this sign informs and educates all users on the suitable application of each fire extinguisher. It also includes the instructions on use and differentiates between each extinguisher’s contents. The sign conforms to BS EN ISO 7010 where applicable. This rigid PVC sign measures 300x500mm.