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Where any device having an open flame or surface temperature greater than 800°F (427°C) is used in a room containing more than 6.6 pounds (3 kg) of refrigerant in a single independent circuit, a hood and exhaust system shall be provided in accordance with Section 510. Such exhaust system shall exhaust combustion products to the outdoors.
Exception: A hood and exhaust system shall not be required where any of the following apply:
  1. The refrigerant is R-718 (water) or R-744 (carbon dioxide).
  2. The combustion air is ducted from the outdoors in a manner that prevents leaked refrigerant from being combusted.
  3. A refrigerant detector is used to stop the combustion in the event of a refrigerant leak (see Sections 1105.3 and 1105.5).

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