Burnham K2WT Residential Installation, Operating And Service Instructions page 49

VII. Venting
E. Assembly of CPVC/PVC Vent Systems (continued)
Figure 7.34: Installation of IPEX and DiversiTech Concentric Terminal Through Roof
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 be 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.
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