Red Seal Gasfitter — Class A Practice Exam

What type of appliance utilizes direct venting?

1. Conventional water heaters

2. Gas ranges

3. High-efficiency furnaces

4. Outdoor grills

The correct answer is: High-efficiency furnaces

High-efficiency furnaces are designed to utilize direct venting systems. This type of venting allows the furnace to draw air from outside the building for combustion and exhaust the gases produced back outside, thus minimizing energy loss and enhancing efficiency. Direct vent systems are particularly beneficial because they create a sealed combustion chamber that prevents backdrafts and ensures that the appliance operates safely and efficiently. This is contrasted with conventional water heaters, gas ranges, and outdoor grills, which typically rely on atmospheric venting methods or do not require venting altogether. High-efficiency furnaces can achieve efficiency ratings that exceed 90% due to this closed-loop system, making them a preferred choice for modern heating needs.