The advantage of the backward curved centrifugal fan over the forward curved centrifugal fan is that

A) backward curved fans are normally quieter in operation
B) backward curved fans are non-overloading
C) backward curved fans operate at lower RPMs
D) backward curved centrifugal fans are well suited for small airflow quantities


B

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Fill in the blank(s) with the appropriate word(s).

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A. nominal B. masonry C. anchor D. girder

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Fan cycling, fan speed control, damper control, and condenser flooding are different types of:

A) Condenser low ambient controls. B) System capacity control. C) Energy efficiency improvements. D) Protection against excessively high condenser pressures.

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When a zone thermostat fan control switch is moved from Auto to On, what should happen?

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