Cost for this system is high, but gives excellent fan speed control , and requires the least amount of energy compared to any other type of control.

Cost for this system is high, but gives excellent fan speed control , and requires the least amount of energy compared to any other type of control.

Cost for this system is high, but gives excellent fan speed control , and requires the least amount of energy compared to any other type of control.



A. Fan speed control
B. Inlet damper control
C. Variable speed coupling
D. Air register




Answer: C


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