7. AREA, SIZE AND DESIGN OF MATERIALS AND PRODUCTS TO BE USED.

7.1. GENERAL
The effectiveness of photoluminescent escape path markings depends on the area of material employed, the luminance properties, the size and frequency of signs employed as well as the expected egress time along the escape route. The provisions of 7.2. and 7.3. describe minimum requirements established from experience and practical tests.

7.2. SAFETY SIGN DESIGN

7.2.1. LUMINANCE RECOMMENDATION
Emergency and directional signs, as well as all supplementary photoluminescent signs to give mandatory and prohibition instructions and to mark and highlight hazards, fire fighting and emergency equipment, should be produced from material with luminance properties of minimum Class I.

7.2.2. SIZE OF SIGN
The ratios of letter height to the size of the geometric shape should be according to National and International Standards for supplementary text. Overall sign size should be derived from visibility distances and the derived minimum letter height as given in Section 7.2.4. All photoluminescent safety signs should have a photoluminescent border of no less than 5mm.

7.2.3 GRAPHIC SYMBOL HEIGHT
The graphic symbol height is the most important element of choosing appropriate signing. When selecting, EXIT signs symbol height shall relate to the viewing distances shown in the table below. First determine where each sign is to be positioned. Then measure the furthest distance from which it has to be seen. This determines the viewing distance, which in turn governs the height of the graphic symbol which must be used.
It is recommended that consideration be given to the use of smaller signs more frequently along an escape route. This is considered more effective than large signs spaced farther distances apart.

All photoluminescent safety signs should have a photoluminescent border of no less than 5mm

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