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When the structure of the house or the exterior grade does not allow location of the vent terminal in compliance
with the instructions in this manual, an alternative is to vent into a clay pipe system installed underground. Refer
to notes in Figure 6 (below).
FIG. 6 – TYPICAL UNDERGROUND VENT INSTALLATION
1. Clay chimney topper, tee, and pipe are manufactured by
Superior Clay Corp., P.O. Box 352, Uhlrichsville, Ohio, 44683.
Clay chimney top devices and pipe from other sources may be
used.
2. Clay pipe must pitch downward away from foundation ⅛" to
¼" per foot.
3. Configuration of transition from tee to topper is dependent
on the type of the topper selected and the level of the finished
grade. Topper must be removable for cleaning.
ALTERNATE UNDERGROUND VENT
NOTES:
4. Seal opening in foundation around clay pipe with hydraulic
cement.
5. Seal all joints and seams in smoke pipe with silicone rubber.
6. When tankless side of boiler must be next to wall, allow
enough distance (approx. 18") to remove coil.
7. Do not use a draft regulator in flue pipe.
8. 6" flue sizes shown on diagram are appropriate for input up to
1.5 gph. 8" flue components may be used for larger firing rates.
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