What is the minimum distance required between the sprinkler deflector and the ceiling for standard pendant and upright sprayed sprinklers?

The minimum distance required between the sprinkler deflector and the ceiling for standard pendant and upright sprayed sprinklers is 1 inch. This distance is essential to ensure that the water spray pattern is effective and that the sprinkler can operate properly in the event of a fire.

If the distance is too small, it could restrict the water distribution and create an ineffective spray pattern, compromising the sprinkler's ability to control or extinguish a fire. Conversely, maintaining this minimum distance helps avoid interference from the ceiling structure, ensuring that the sprinkler can activate effectively.

Understanding the correct spacing is crucial for compliance with safety standards and for the overall performance of the fire suppression system.