How often should labels be placed on the indoor duct piping?

Labels on indoor duct piping are essential for ensuring proper identification and facilitating maintenance, repairs, and system checks. The correct interval for placing these labels is every 10 feet of length. This frequent labeling allows for quick identification of the ductwork's path and characteristics, which can be critical during inspections and activities such as radon mitigation.

Labeling every 10 feet ensures that anyone working on or analyzing the duct system can easily follow its layout and understand its function without having to search for information over longer distances. This practice enhances safety and efficiency, especially in complex systems where distances are greater. It also helps minimize the risk of mix-ups or accidents that might arise from misidentified ducts.

While labeling every floor level or only at the system initiation may have some benefits, they do not provide the same level of clarity and immediacy that labeling every 10 feet does. Similarly, labeling every 20 feet might lead to gaps that could undermine the system's overall effectiveness, as individuals may not have sufficient reference points along the duct runs.