The correct answer is:
A. 3 in.(75 mm)
This information can be found in several NFPA standards related to sprinkler systems, including:
•NFPA 13, Standard for the Installation of Sprinkler Systems, 2022 edition (Section 9.2.3.4)
•NFPA 13D, Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, 2022 edition (Section 8.2.3.4)
•NFPA 13R, Standard for the Installation of Sprinkler Systems in Low-Rise Residential Occupancies, 2022 edition (Section 9.2.3.4)
These standards all mandate a minimum clearance of 3 inches (75 mm) between the hanger and the centerline of an upright sprinkler to ensure the sprinkler's unimpeded operation and discharge pattern in case of a fire.
It's important to note that other standards with different requirements might exist, so it's always best to consult the specific NFPA standard relevant to your situation for accurate information. Additionally, always adhere to local codes and regulations when working with fire protection systems.
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