In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________ is required.

In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________ is required.

In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________ is required.




a. Gradual switch
b. Offset returned air duct
c. Air mixer
d. Variable air volume box
e. Variable frequency motor drive


Answer: a


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