Quick Reference Guide

UNT-PRC015-EN 13
Determining Riser Length
The required riser length is determined by knowing the floor-to-floor height of the building and
adding the length of the riser that fits into the swaged connection.
When a unit is ordered, the riser length and the desired vertical location of the riser on the unit must
be specified. The positioning of the riser is important. This determines the location along the
building structure or in-between floors where the riser brazing joints will be made. Care must be
taken to assure that the brazing location is not in between floors or in other difficult to reach areas.
Coordination with the installing contractor should be done before risers are ordered to determine
their exact location and length.
• Riser Extensions
“Between-the-floor” riser extensions are used when standard riser lengths are not long enough
to reach the floor-to-floor height.
Note: Maximum riser length is 10 feet.
“Between-the-floor” riser extensions are available and made with a swage connection on one
end.
Riser diameters in a column may not be equal size throughout their length, therefore riser
extensions are also used when a change in riser diameter is needed between floors.
Note: All riser extensions are shipped loose for field installation.
Figure 7.