How can obstruction in a sprinkler's spray pattern affect performance?

Obstruction in a sprinkler's spray pattern primarily impacts performance by blocking water distribution, which significantly reduces the effectiveness of fire suppression. When there is an obstruction—such as furniture, walls, or other objects—it interferes with the intended distribution of water over the area that needs protection. This can lead to areas that do not receive adequate coverage, potentially allowing fire to spread in those locations. Effective fire suppression relies on the ability of the water to reach all necessary areas to cool down and extinguish flames, so any obstruction hinders that essential function and directly affects the fire safety of a space.

The other options do not accurately reflect the consequences of obstructions. Enhancing water pressure is contrary to how obstructions function, and intending to spray water in the right direction is compromised by physical barriers. Therefore, the most critical consequence of an obstruction in a sprinkler's spray pattern is the significant reduction in its effectiveness in suppressing fire.