Chapter 33 section 15 of the Grenfell Enquiry: Phase 1 Overview recommends each floor of a high-rise building should be numbered and visible in both low light and smoke conditions as well as normal. Photoluminescent signs can help greatly here. Check out our website for details of our Floor Information Number Signs (FINS) made in PrimaDura Glow Class D Photoluminescent they are fire proof, vandal proof, highly visible and glow for longer, or contact us direct enquiries@safewaysystems.co.uk for further information.