Where is signage required on piping and fittings for an air-sampling smoke detection system?

Signage requirements for air-sampling smoke detection systems are essential for maintaining system integrity and ensuring that maintenance personnel can easily identify the system's layout. The correct answer indicates that signage must be placed at changes in direction or branches of piping and not greater than every 20 feet.

This requirement is important because changes in direction and branches can create confusion when navigating the system. Clearly marked signs help technicians quickly locate specific sections of the piping during installation, maintenance, or troubleshooting. Additionally, having signage spaced at intervals no greater than 20 feet ensures that critical information is readily available without requiring extensive searching, thus optimizing safety and efficiency in emergency situations.

Including signage at these specific locations minimizes the chances of overlooking critical components of the system, thereby facilitating proper inspection and ensuring that the system operates effectively to detect smoke.