A material will be certified as Group 1, 2 or 3 (or 1-S, 1, 2-S, 2, 3 or 4 for New Zealand) and Specification C1.10 of the NCC explains what Group number is required in each area of a building. The lower the Group number, the more fire resistant the material is, so a Group 1/1-S is the best achievable certification and Group 1/1-S ceilings have the flexibility to be installed anywhere in a building.
All AMF Ceilings products achieve a Group 1/1-S certification.