Which type of sprinkler heads are typically used in areas with suspended ceilings?

Pendant sprinklers are ideally suited for installation in areas with suspended ceilings because they are designed to hang below the ceiling plane. This design allows for effective coverage of the space below while accommodating the ceiling's layout. Pendant sprinklers utilize gravity to aid in the distribution of water, ensuring that the spray pattern effectively covers a wide area.

In suspended ceiling environments, the pendant design helps to avoid interference with ceiling tiles and other components, allowing for unobstructed flow of water in case of a fire. They can also be installed at various heights, which provides additional flexibility depending on the ceiling configuration and the height of the room.

Other types of sprinkler heads, such as upright and sidewall sprinklers, are not as suitable in these situations due to their specific mounting requirements or spray patterns that do not align well with the layout of suspended ceilings. Concealed sprinklers, while they can be aesthetically pleasing and fit a specific design intent, are usually more complex and are hidden within the ceiling tiles, which can complicate maintenance and inspection. Thus, pendant sprinklers are the preferred choice for their effective performance and compatibility with suspended ceilings.