Residential HVAC Installation Practice Exam

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Which of the following represents the lowest vacuum?

  1. 500 microns

  2. 750 microns

  3. 1,000 microns

  4. 1,200 microns

The correct answer is: 1,000 microns

The correct answer is C: 1,000 microns because the lower the number of microns, the higher the vacuum level. In this context, a lower vacuum level indicates a more efficient removal of air and moisture from the HVAC system, which is crucial for optimal system performance and longevity. Therefore, 1,000 microns represent the lowest vacuum level among the given options.

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