Residential HVAC Installation Practice Exam 2026 - Free HVAC Practice Questions and Study Guide

In this question, the correct answer is 1,000 microns in 1 mm Hg. The unit "mm Hg" stands for millimeters of mercury, which is a unit of pressure commonly used in HVAC (heating, ventilation, and air conditioning) systems. One mm Hg is equivalent to 1,000 microns of mercury. This conversion factor is important for accurately measuring and managing the pressure levels within an HVAC system.

Regarding the other options:

A. 100 microns: This is not the correct conversion. It is important to understand the metric relationship between millimeters of mercury and microns in order to work effectively with HVAC systems.

B. 500 microns: This is not the correct conversion. Understanding the precise relationship between different units of pressure is crucial for accurate HVAC installations.

D. 1,500 microns: This is not the correct conversion. Knowing the exact conversion between millimeters of mercury and microns helps ensure the proper functioning of HVAC systems.