When installing semi-rigid metallic tubing for a gas furnace, what is the maximum length of the links?

The maximum length for semi-rigid metallic tubing used in gas furnace installations is specified as 6 feet. This limit is established to ensure both safety and performance. Longer lengths can lead to increased resistance and potential pressure drops within the system, which may negatively affect the gas supply to the furnace. Additionally, longer runs could make installation more complex and may introduce concerns regarding proper support and alignment of the tubing.

Adhering to the 6-foot maximum helps maintain the efficiency of the appliance and ensures that it operates safely, preventing potential hazards that can arise from improper gas line runs. Familiarity with these requirements is essential for compliance with local codes and regulations, thus enhancing the overall safety and reliability of HVAC installations.