gas production facility, (2) imported into the United States by a fluorinated greenhouse gas importer, or (3) emitted by an industrial fluorinated greenhouse gas facility. (b) Amount of fee The amount of fee imposed by subsection (a) shall be equal to the applicable percentage (as defined in subsection (c)(5)) of the applicable amount determined under section 4691(b) per ton of carbon dioxide equivalent produced or imported. (c) Definitions For purposes of this section— (1) Fluorinated greenhouse gases The term fluorinated greenhouse gases means sulfur hexafluoride (SF6), nitrogen trifluoride (NF3), any hydrofluorocarbon, any perfluorocarbon, any fully fluorinated linear, branched or cyclic alkane, ether, tertiary amine or aminoether, any perfluoropolyether, any hydrofluoropolyether, and any other fluorocarbon except for substances with vapor pressures of less than 1 mm of Hg absolute at 25 degrees Celsius. (2) Fluorinated greenhouse gas production facility The term fluorinated greenhouse gas production facility means any facility which is included under the industrial gas supplier source category under subpart OO of part 98 of title 40, Code of Federal Regulations, as in effect on the date of the enactment of the American Opportunity Carbon Fee Act of 2018 . (3) Fluorinated greenhouse gas importer The term fluorinated greenhouse gas importer means any importer who is included under— (A) the industrial gas supplier source category under subpart OO of part 98 of title 40, Code of Regulations, as in effect on the date of the enactment of the American Opportunity Carbon Fee Act of 2018 , or (B) the source category under subpart QQ of such part (as so in effect). (4) Industrial fluorinated greenhouse gas facility The term industrial greenhouse gas facility means any facility which— (A) is included under— (i) the aluminum production source category under subpart F of part 98 of title 40, Code of Regulations, as in effect on the date of the enactment of the American Opportunity Carbon Fee Act of 2018 , (ii) the