When measuring the distance from a metal pan deck to the sprinkler, if the pan is 3 inches or larger, to where should the measurement be taken?

When measuring the distance from a metal pan deck to the sprinkler, if the pan is 3 inches or larger, the measurement should be taken from the upper part of the pan. This is because the upper edge represents the closest point at which the sprinkler can effectively deliver water to cover the area beneath it.

In fire protection design, accurate measurements are crucial for ensuring that sprinklers are appropriately positioned to provide optimal coverage and response times during a fire event. The upper part of the pan is the point that dictates the height at which the sprinkler operates, as it influences the trajectory and distribution of water droplets when the sprinkler activates.

Other options may not provide a consistent or effective reference point for ensuring sufficient water coverage. Measuring from the low part, center, or outside edge could lead to inaccuracies in the design and installation of the sprinkler system, potentially compromising its effectiveness in an emergency situation. Thus, focusing on the upper part of a larger pan ensures adherence to standards and best practices in sprinkler installation.