CSLB Class B General Contractor's License Practice Exam

When installing a gas-fired ducted furnace in a garage, the burner must be located how high above the floor?

1. No less than 12 inches

2. No less than 18 inches

3. No less than 24 inches

4. No less than 30 inches

The correct answer is: No less than 18 inches

In the context of installing a gas-fired ducted furnace in a garage, the requirement for the burner to be located a minimum of 18 inches above the floor is crucial for safety. This height specification is designed to minimize the risk of ignition from gasoline vapors, which can accumulate near the floor in a garage environment. Gasoline vapors are heavier than air and can pose a significant fire hazard if they come into contact with ignition sources. By ensuring that the burner is installed at least 18 inches above the ground, the likelihood of these vapors reaching the burner is reduced, promoting a safer installation. This requirement aligns with building codes and safety standards that stress the importance of preventing accidental fires, especially in areas like garages that may contain flammable substances. It’s essential to adhere to these guidelines when dealing with gas installation to protect property and lives effectively.