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Section 309 Temperature Control [B]

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309.1 Space-Heating Systems
Interior spaces intended for human occupancy shall be provided with active or passive space-heating systems capable of maintaining a minimum indoor temperature of 68°F (20°C) at a point 3 feet (914 mm) above floor on the design heating day. The installation of portable space heaters shall not be used to achieve compliance with this section. [B]

Exception:
Interior spaces where the primary purpose is not associated with human comfort.

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