What is the maximum permitted length for a metal flex line to a residential furnace?

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The maximum permitted length for a metal flex line to a residential furnace is 3 feet. This limitation exists for several reasons, primarily related to ensuring safety and efficiency in the gas supply system. A shorter length helps maintain proper gas pressure and flow, minimizing the potential for leaks and ensuring that any appliances receive the correct amount of gas for optimal performance.

Additionally, shorter lines are easier to inspect and maintain, which is important for compliance with safety standards and regulations. A length of 3 feet provides adequate flexibility to connect the furnace while still adhering to the guidelines set by industry standards and local codes. Keeping the flex line within this limit reduces the risk of damage to the line itself and ensures that installation practices are consistent and reliable, leading to long-term operational integrity in heating systems.

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