Which type of humidifier requires the least cleaning?

A) Bypass evaporative humidifiers, which do not hold water in a sump
B) Plate-type humidifiers
C) Motorized atomizing humidifiers
D) Wetted-element humidifiers that have a water sump


A

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The defrost cycle is normally terminated:

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

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