What must be avoided in the installation of flexible lines for optimal performance?

Twisting the lines must be avoided during the installation of flexible lines because it can create stress points within the material, leading to potential damage or failure over time. When flexible lines are twisted, it adversely affects their ability to carry fluid or air efficiently, as the internal pathways for fluid flow become compromised. This twisting may also cause premature wear on the line or even leaks, which can significantly impact system performance and safety. Proper installation requires that lines remain straight or are bent in appropriate curves to maintain the integrity and performance of the flexible lines, ensuring they function as intended within the system.