Gas Fitter Practice Test

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How many duct openings are required for a bypass humidifier?

One
Two
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Four

The correct answer is: Two

For a bypass humidifier, two duct openings are required: one for the supply side of the furnace or air handler, and another for the return side. This configuration allows the humidifier to draw warm air from the furnace, humidify it, and then return it into the home's air distribution system. The need for two openings ensures that humidified air can be circulated effectively throughout the space, while one opening alone would be insufficient for achieving the desired humidity levels. Using both openings facilitates a proper airflow pattern, which optimally distributes the moisture-laden air. This setup is vital for maintaining indoor air quality and comfort during dry seasons.