Which of the following is a source for information about proper hanger spacing?

The source for information about proper hanger spacing is primarily the manufacturer's guidelines. Manufacturers provide specific recommendations based on the materials and products they produce, ensuring that the installation adheres to best practices for safety and performance. Hanger spacing can vary depending on the type of pipe, the material construction, and the intended application, making the manufacturer's guidelines a critical resource for determining the most effective and compliant spacing requirements.

Job specifications, while relevant to an individual project, may not encompass the detailed technical standards needed for proper hanger installation. Local code can provide general requirements but might not address specific hanger spacing, and industry standards might give broader guidelines without specificity that a manufacturer's manual provides. Therefore, referencing the manufacturer's guidelines is essential for ensuring the right spacing is implemented.