Quick Reference Guide

12 UNT-PRC015-EN
Expansion Compensation
Do not rigidly fasten the risers within each unit. They must be free to move within the pipe chase
with normal vertical expansion and contraction movements. The built-in risers must be anchored
at some point to the building structure by the installing contractor. The unit design will
accommodate up to 1-1/8 inch expansion and contraction (2-1/4 inch total movement) of the riser
assemblies. If the total calculated riser expansion exceeds 2-1/4 inches (minimum-to-maximum),
the installing contractor must provide and install additional expansion compensation devices in
each riser.