What is the maximum allowable distance for supporting PEX-ALPEX installed horizontally?

The maximum allowable distance for supporting PEX-ALPEX installed horizontally is indeed 98 inches. This specification is important because it helps to ensure that the PEX-ALPEX tubing is adequately supported to prevent sagging or bending that could lead to stress points and potential failure over time.

Using the correct support spacing reduces the risk of damage to the tubing due to its flexibility and prevents issues such as water hammer or noise caused by movement. Ensuring that the support spacing adheres to the manufacturer's guidelines also impacts the longevity and reliability of the plumbing system.

The other distances mentioned, such as 36 inches, 48 inches, and 120 inches, would not align with the industry standards or manufacturer recommendations for horizontal installations of PEX-ALPEX, thereby highlighting the importance of knowing the proper specifications in plumbing installations.