313D Residential Air Conditioning Systems Mechanic

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A homeowner complains of a persistent whistling noise coming from a supply air register, which becomes louder when other registers in the house are closed. What is the most probable cause of this issue?

The return air filter is oversized. The air velocity through the register is too high. The thermostat is located too close to the supply register. The ductwork is oversized for the system's CFM output.

Correct Answer:

The air velocity through the register is too high.

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