The pressure for supervisory air in preaction and deluge systems may vary from ______________.

The pressure for supervisory air in preaction and deluge systems is designed to maintain the integrity of the system and ensure proper operation. The range specified in the correct answer, which spans from a few ounces to 40 psi or more, reflects the diverse operational requirements of these systems.

In preaction systems, the supervisory air pressure is essential in maintaining the readiness of the system without activating the water flow until necessary. Having a supervisory air pressure range that can reach up to 40 psi or beyond is crucial for managing the mechanical and environmental stresses these systems encounter. This flexibility allows for adjustments based on specific installation conditions, such as elevation changes and potential pressure loss in the piping.

Therefore, the broad pressure range ensures adequate control and functionality for different system configurations and environmental considerations, enabling reliable performance when the system is activated.