Floor identification sign specifications

The floor identification signs should meet all of the following—(a) the signs should be located on every landing of a protected stairway and every protected corridor/lobby (or open access balcony) into which a firefighting lift opens; (b) the text should be in sans serif typeface with a letter height of at least 50 mm. The height of the numeral that designates the floor number should be at least 75 mm; (c) the signs should be visible from the top step of a firefighting stair and, where possible, from inside a firefighting lift when the lift car doors open; (d) the signs should be mounted between 1.7 m and 2 m above floor level and, as far as practicable, all the signs should be mounted at the same height; (e) the text should be on a contrasting background, easily legible and readable in low level lighting conditions or when illuminated with a torch;