<prompt> Translate the following text to EnglishKwa ujumla, kiasi cha chuma cha muundo kwa mfumo wa kawaida wa FGD ni sawa au chini ya mahitaji ya chuma kwa ajili ya SCR ya ukubwa huo.  <response>: In general, the amount of structural steel for a typical FGD retrofit system is equal to or less than the steel requirements for a SCR retrofit of the same size. 