Stored material should not be stacked closer than what distance to a sprinkler head?

Stored material should not be stacked closer than 18 inches to a sprinkler head to ensure that the sprinkler system can function effectively in the event of a fire. This distance allows for proper spray patterns and water distribution when the sprinkler is activated. If materials are stacked too close to the sprinkler, they can obstruct the water discharge, preventing the sprinkler from extinguishing the fire properly or adequately cooling the area.

Additionally, maintaining this clearance helps to minimize the risk of the stored materials igniting due to the heat generated from a fire. Understanding the required distances is crucial for fire safety management and compliance with fire codes, as it supports the overall efficiency of fire protection systems in place.