Kilns used for firing ceramic ware, heated exclusively by natural gas,
liquid petroleum gas, electricity, or any combination thereof are permitted
by rule where the conditions of this section are met:
(1) the total heat input is ten million British thermal units
per hour or less; and
(2) there are no emissions of lead, beryllium, or fluorides,
and emissions of sulfur dioxide and particulate matter from both the material
being fired and fuel burned do not exceed 25 tons per year of either air contaminant.
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