U.S. Boiler Company K2, Installation Instructions Manual

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Figure 7.34: Installation of IPEX and DiversiTech Concentric Terminal Through Roof
VII. Venting
E. Assembly of CPVC/PVC Vent Systems (continued)
b. For vertical installations, cut a hole in the roof large enough to clear the concentric terminal at the location of the terminal
(see Part VII-C of this manual for permitted terminal locations).
c. If desired, the terminal can be shortened. See Figure 7.32 for specific information on making the terminal kit shorter based
on the kit size being used. Cut the pipe squarely and de-burr both the OD and ID of the cut edges.
d. Cement the inner pipe section of PVC pipe supplied with this kit to the Wye fitting using a primer and cement listed for
use with PVC.
e. Cement the outer pipe to the Wye, being careful, to keep the inner and outer pipes concentric.
f. Slip the partially assembled terminal through the wall or ceiling from the inside and for horizontal installations orient so
that the side outlet on the Wye is on or above the horizontal plane.
g. For horizontal installations, seal the gap between the OD of the “outer pipe” and the exterior side of the wall with RTV
sealant.
h. Cement the rain cap onto the inner pipe. If desired, the rain cap can be attached to the inner pipe with the supplied
stainless steel screw and nut so that it can be later removed for cleaning and inspection. If this is done, drill a
3/16”clearance hole in the rain cap and inner pipe in the location shown on Figure 7.32 for the size terminal kit being used
and affix screw and nut. Do not overtighten. A field supplied rodent screen may also installed on the end of the rain cap.
i. For vertical installations, use a roof flashing and storm collar to prevent moisture from entering the building. Seal the roof
flashing to the roof using generally accepted practice for the type of roof on the installation. Install the storm collar after
verifying that the bottom of the rain cap will be at least 12” above the normal snow line. Apply RTV to seal the storm
collars to the terminal.