Glass block used as closures in fire separations required to have a fire-resistance rating of not more than 1 h, where the glass block has not been tested in accordance with Sentence 9.10.3.1.(1) [i.e. not tested in accordance with the test methods described in Part 3, Appendix A-9.10.3.1., or Appendix D].

This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].

This also applies to the protection of openings:

• near unenclosed exit stairs and ramps, as stated in Sentence 9.9.4.4.(1),
• in exterior walls of exits, as stated in Sentence 9.9.4.5.(1), and
• near exit doors, as stated in Sentence 9.9.4.6.(1).

To supersede the requirements of Sentences 9.10.3.1.(1) and 9.13.1.1.(1), which would otherwise require the glass block to be tested and to meet certain minimum fire-protection ratings in accordance with certain standards, on the basis that the glass block [which is otherwise required to be installed in conformance with Section 9.20.] provides an acceptable level of protection against the spread of fire, in situations where the fire separation is required to have a fire-resistance rating of not more than 1 h.