The blowers of high-sidewall ductless indoor units _____.
a. are usually propeller fans
b. use long, slender centrifugal blower wheels
c. use very short, large-diameter blower wheels
d. are often backwardly inclined
Question 2
When a zone thermostat fan control switch is moved from Auto to On, what should happen?
a. All system dampers open and the blower starts.
b. The zone damper for each zone set to On opens and the blower starts.
c. The zone damper for that zone closes, all the others open, and the blower starts.
d. The zone damper remains open at all times, regardless of the system operating conditions
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