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910.3.2.3 Nonsprinklered Buildings
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Where installed in buildings not provided with an approved automatic sprinkler system, smoke and heat vents shall operate automatically by actuation of a heat-responsive device rated at between 100°F (38°C) and 220°F (104°C) above ambient.
Exception: Gravity-operated drop-out vents complying with Section 910.3.2.1.