Which of the following is not an acceptable use of door stops in relation to gas wall furnaces?

The use of door stops in relation to gas wall furnaces is critical for maintaining safety and functionality. One key point is that door stops should not be utilized to maintain clearance from equipment. Maintaining proper clearance is essential to ensure adequate airflow and safe operation of the furnace. This type of use could inadvertently restrict airflow, which can lead to overheating or improper combustion within the appliance.

In contrast, using door stops to hold doors open or prevent door closures might be acceptable under certain conditions. Holding doors open can facilitate airflow in some instances, provided it doesn't interfere with the furnace's operation. Similarly, preventing closures can ensure that access to the furnace remains unobstructed.

Allowing airflow around equipment is crucial for the safe and efficient operation of gas wall furnaces. Ensuring that air circulation is not hindered is paramount, and door stops that manage door positions to support airflow can be a proper application.

Therefore, the option that incorrectly identifies an acceptable use of door stops relates directly to clearance maintenance, emphasizing the importance of keeping the furnace and its operating environment safe and efficient.