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The fire-resistance test shall not be regarded as successful unless the following conditions are met:
(a) The test assembly shall have remained securely in the opening during the fire exposure period and during the hose-stream test, except that small fragments of glass dislodged from the exposed surface by the hose stream shall not be considered a weakness. The fastening of ventilators or movable sections shall have remained secure.
(b) The test assembly shall have withstood the fire-endurance test without passage of flame; and shall have withstood the fire-endurance and hose-stream tests without the dislodgement of an excessive proportion of the glass area. A loss of approximately ten percent shall not be considered excessive.
(Prior code § 65-6.4)