Air sampling network piping must be labeled clearly at intervals of no greater than what distance on the piping?

The correct answer is based on industry standards and practices regarding the labeling of air sampling network piping. Clear labeling of piping at specified intervals is crucial for maintenance, safety, and operational efficiency. The requirement to label pipes at intervals no greater than 20 feet ensures that personnel can easily identify and track the air sampling network, facilitating quicker responses in emergency situations, as well as regular inspections and maintenance.

Limiting the distance between labels to 20 feet strikes a balance between accessibility and practical labeling. If the intervals were set longer, it could create challenges for technicians who need to locate specific sections of the piping quickly, especially in larger installations where the complexity of the system increases the likelihood of miscommunication or confusion.

In summary, labeling air sampling network piping at intervals of no greater than 20 feet assures clear identification and consistent recognition of the system throughout its installation, aligning with best practices in fire alarm system design and maintenance.