If you have 3 dry systems in a building sharing an air compressor, how many air maintenance devices are required?

In a scenario where there are three dry systems in a building that share a common air compressor, air maintenance devices must be installed to ensure that the systems maintain the necessary air pressure to function effectively. Each dry system requires its own air maintenance device, as each system must be capable of maintaining its specific air pressure independently to prevent any issues related to system performance, like loss of air pressure which could lead to inadequate operation or system failure.

Since there are three distinct dry systems, the requirement is for three dedicated air maintenance devices—one for each system. This setup allows for proper monitoring and regulation of air pressure in each system, ensuring safety and operational standards are upheld. Therefore, having three air maintenance devices is essential to maintain the integrity and reliability of each individual dry system.