Which of the following is NOT true about the installation of floor drains?

The assertion that installations of floor drains must always have extensions is inaccurate because floor drains can be installed in various configurations depending on the site requirements and the specific type of floor drain being used. For example, certain floor drains can be set to grade, meaning they can be installed level with the surrounding surface without the need for extensions. This flexibility allows for more customizable installations based on the terrain, flooring materials, and the intended use of the drain.

In some scenarios, floor drains are designed to facilitate drainage without extensions by utilizing built-in features that adequately manage water flow. Therefore, the necessity of extensions is not absolute and can vary, making the idea that they "must always" have them incorrect. Understanding the installation requirements of floor drains is crucial for ensuring effective drainage and preventing issues such as blockages or improper drainage function.