safety
2.4 Permanent Screen Protection
If the glazing is installed behind a permanent robust screen, it need not itself comply with any other safety requirements providing the screen:
(a) Would prevent a sphere 75mm diameter from coming into contact with the glazing.
(b) Is sufficiently robust to sustain a least a centrally applied force of 1100 Newtons. If the protective system is multi-railed, each rail must satisfy this recommendation.
