Which type of sprinkler is designed to have the water stream directed downward against the deflector?

The pendant sprinkler is specifically designed to have the water stream directed downward against the deflector. This design allows for effective water distribution over a wide area below the sprinkler. The downward orientation of the water stream is essential for maximizing the coverage and effectiveness of the sprinkler system, especially in areas with ceilings where the fire risk is typically located.

The pendant sprinkler typically hangs from the ceiling and is mounted in a way that allows the deflector to spread the water evenly over the protected area, ensuring that the fire is adequately suppressed. This type of sprinkler is particularly useful in spaces where ceilings are present, as it can efficiently manage heat and smoke while also aligning with the ceiling's structure.

In contrast, other sprinkler types have different orientations or installation positions that do not utilize a downward water stream directly against a deflector. The upright sprinkler, for example, directs water upward, which then gets deflected downward, while sidewall sprinklers are mounted on walls and disperse water horizontally. Concealed sprinklers are designed to remain hidden until activation, and their operation is influenced by a ceiling's design but also does not feature the same downward water stream as pendant sprinklers.