Definition: A refrigerant that may ignite or burn. This includes butane, propane, isobutane and certain other hydrocarbons. Flammable refrigerants are considered dangerous because of their risks to service personnel as well as the occupants of a vehicle should there be a refrigerant leak into the passenger compartment or during a collision. Flammable refrigerants are not approved for use in mobile A/C systems by the EPA.

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