Gas Heat ESCO Practice Exam

In a Category IV two-pipe vent system, which is used for high-efficiency gas heating equipment, the combustion air intake should point upwards above the roof of the residence. This is done to prevent any debris, water, or snow from entering the combustion air intake and potentially causing operational issues or safety hazards. By pointing the combustion air intake upwards, the system is less likely to become obstructed and can more effectively draw in the air needed for combustion.