Q338. For Tier 3, if I have multiple combustion sources using a single fuel type, should I enter this as an aggregation of units?
A338. While it is possible for an aggregation of units to use Tier 3 for certain fuel types, it is important to remember that the aggregation of units option is only allowed if each unit in the group is smaller than 250 mmBtu/hr. If the use of Tier 3 is required because any given unit is larger than 250 mmBtu/hr, the use of the aggregation of units option would not be allowed.
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Source: This question and answer was derived from a Legacy FAQ
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Relevant Subparts: Subpart C
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