The choice of installing the SCR reactor near the ground level or elevated well above ground level depends upon which configuration is viewed as most cost effective while considering installation cost and operating cost.
SCR reactors can only be installed near to ground level.
mnli hypothesis: SCR reactors can only be installed near to ground level. premise: The choice of installing the SCR reactor near the ground level or elevated well above ground level depends upon which configuration is viewed as most cost effective while considering installation cost and operating cost.