Which is true about the installation position of a pendent sprinkler?

The installation position of a pendent sprinkler is crucial for its effectiveness, and the statement regarding its installation above the ceiling is accurate. Pendent sprinklers are specifically designed to be installed in a location where they can effectively distribute water over a wide area when activated. For optimal performance, they need to be positioned underneath the ceiling, allowing them to take advantage of the prevailing air flow and achieve the best coverage during activation.

When installed above the ceiling, the water discharged from the deflector forms a pattern that covers the area beneath it, ensuring effective fire suppression. This design is essential, as it allows the sprinkler system to respond quickly to heat and smoke, facilitating the control of a fire before it spreads.

The other statements either misinterpret the design or functionality of the sprinkler system. For instance, a pendent sprinkler does not have to be installed with the deflector positioned upwards, nor does it need to direct water at an angle, as it is designed for downward water flow. Furthermore, while the installation can be vertical, it is specifically oriented for downward discharge, distinguishing it from other sprinkler types such as upright sprinklers. Thus, the correct choice highlights the importance of proper placement above the ceiling in maximizing the sprinkler's effectiveness.