Gas Fitter Practice Test 2025 – The All-in-One Guide to Mastering Your Certification!

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When do plate humidifiers operate?

All the time the fan is running

Plate humidifiers are designed to operate whenever the air circulation system is active, which typically means they function all the time the fan is running. This continuous operation helps to maintain consistent humidity levels in the conditioned space by delivering moisture into the airflow as it passes over the plates of the humidifier.

When the fan is running, the plate humidifier can effectively introduce moisture into the air, regardless of whether the fan is on low or high speed. Therefore, the operation of the humidifier is closely tied to the fan's activity, allowing for optimal performance in maintaining indoor air quality. The humidistat's role is to regulate the overall humidity levels, but the humidifier itself is designed to work continuously in harmony with the fan's operation to ensure adequate humidity distribution throughout the space.

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Only when the fan is on low speed

Only when the fan is on high speed

Only when the humidistat calls

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