What is the recommended distance for sprinklers from walls according to NFPA 13?

The recommended distance for sprinklers from walls according to NFPA 13 is at least 4 inches away from walls. This guideline is established to ensure that the sprinkler's discharge pattern is not obstructed by walls or other structures, which can interfere with the effective spray and distribution of water. By positioning the sprinklers at least 4 inches away, the system is designed to optimize coverage and allow the water to reach areas that may otherwise be shielded by the wall.

Maintaining this distance is crucial in achieving the intended performance of the sprinkler system, as obstructions can lead to reduced efficacy in suppressing a fire. The 4-inch clearance also helps to accommodate any installation and maintenance needs, as well as potential deflections in water distribution caused by infrared reflectance or other environmental factors. This standard contributes to the overall reliability and effectiveness of fire protection systems in buildings.