FGD systems are installed on the back end of a facility, are usually built close to the ground, and do not require the amounts of structural steel generally associated with elevated installations such as SCR.
It is cheaper to install an FGD system than a SCR system.
mnli hypothesis: It is cheaper to install an FGD system than a SCR system. premise: FGD systems are installed on the back end of a facility, are usually built close to the ground, and do not require the amounts of structural steel generally associated with elevated installations such as SCR.