Gas Fitter Practice Test

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When does an automatic vent damper on a mid-efficiency furnace open?

Before the ignition cycle
When the furnace is hot
At the same time as the gas comes on
When the main switch is turned on

The correct answer is: Before the ignition cycle

An automatic vent damper on a mid-efficiency furnace opens before the ignition cycle to ensure that the combustion process can take place safely and efficiently. This timing is crucial because it allows any potential buildup of flue gases to be vented out of the system prior to igniting the gas. By opening first, the damper helps to establish a proper draft and prevent back-drafting, which can lead to dangerous conditions. Understanding this function is vital for maintaining safe operation in gas appliances. The damper’s design ensures that the environment is conducive for combustion, enhancing efficiency as well. This characteristic is what distinguishes it from other options, as it emphasizes the sequence of operations rather than the furnace's temperature or state of operation.