What is the required marking frequency for indoor duct piping according to mitigation standards?

The correct marking frequency for indoor duct piping according to mitigation standards is every 10 feet of length. This requirement is established to ensure that the piping can be easily identified and assessed during radon mitigation work. Marking the piping at regular intervals helps workers quickly locate the ducts, understand the layout, and facilitates maintenance, inspections, or any necessary corrective actions.

The 10-foot interval strikes a balance, allowing for adequate visibility while maintaining a practical approach to marking in diverse indoor environments. This standard helps ensure that the identification of piping systems is straightforward, which is crucial for effective radon mitigation operations. Properly marked duct piping contributes to the overall safety and efficiency of radon mitigation efforts.