R-32 is one of those "mildly flammable gases" (A2L)
The refrigerant in this accident is R-32 (), described as " a colorless, odorless, mildly flammable gas. "Its ASHRAE rating is A2L, making it a CAT1B flammable gas if OSHA adopts Rev. 7 of the GHS this year. These A2L "mildly flammable gases" are exempt from many of the requirements other flammable gases must meet (e.g., electrical classifications, mechanical exhaust ventilation, gas detection, etc.).
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