1104.3.3 Protection from refrigerant decomposition.
MC § 1104.3.3
Where any device having an open flame or surface temperature greater than 800°F (426.7°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-717, R-718 or R-744.
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).
