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Variable Frequency Drive

So as we were talking about these cooling towers, one of the things we're looking for, regardless of whether it's an evaporative condenser fluid cooler or open condenser water flow, it's something that has a variable frequency drive. That means that it's going to control the system based on the need. So it's, again, tied to an energy management system. Sometimes it can be standalone, depending on what it's sensing, which is typically temperature control, and trying to maintain a certain condenser water temperature that goes back to the chiller. So instead of the old on-off or two speed, low speed, high-speed cooling tower fans, these variable frequency drives can actually slow ramp up the cooling tower and then bring it down and just let it float at a lower level using less energy, rather than that hard start, hard stop where you hear the belts chirping, and it's harder on the motors and all of those things.