What must be referenced to determine the required sprinkler spacing during design?

The correct answer indicates that manufacturer installation specifications are essential for determining the required sprinkler spacing during design. These specifications provide detailed guidance on how far apart sprinklers should be placed to ensure effective coverage and adequate protection based on the type of sprinkler, the specific application, and the environment in which they are installed.

Each sprinkler manufacturer has unique guidelines that account for variations in their products, including flow rates, spray patterns, and specific installation requirements that will ultimately influence coverage effectiveness. By consulting these specifications, a designer can align the spacing with the sprinkler's design and ensure compliance with safety standards.

While local fire codes offer critical regulations and compliance mandates, they often do not prescribe specific spacing for different types of sprinklers, making them secondary to the manufacturer's guidelines. Architectural blueprints could provide layout information but do not typically contain the technical specifications necessary for effective sprinkler spacing. Previous project designs might serve as a reference for design choices, but they may not reflect current codes or manufacturer specifications which could have changed since those projects were completed.