Fixed roof
Fixed roof means a cover that is mounted on a unit in a stationary position and does not move with fluctuations in the level of the liquid managed in the unit.
Source
40 CFR § 63.7957
Scoping language
Terms used in this subpart are defined in the CAA, in 63.2, and in this section. If a term is defined both in this section and in another subpart cross-referenced by this subpart, then the term will have the meaning given in this section for purposes of this subpart.