G2 Gas Fitter Practice Exam

What is the minimum clearance required from combustible materials for a central furnace on the sides?

1. 2 inches

2. 6 inches

3. 12 inches

4. 18 inches

The correct answer is: 6 inches

The minimum clearance required from combustible materials for a central furnace on the sides is 6 inches. This requirement is in place to ensure safety and prevent the risk of fire that could arise from heat generated by the furnace. Combustible materials can easily ignite if exposed to excessive heat; therefore, maintaining a clearance of at least 6 inches provides a buffer zone that helps to dissipate heat and protects surrounding materials. While other clearances may be specified for different types of appliances or in particular installations, the standard for a central furnace is specifically set at this measurement to balance safety and practicality in residential and commercial settings. Thus, this requirement is rooted in both building codes and manufacturer specifications, which are designed to minimize hazards associated with gas appliances.