IBC SFC-99 Installation And Operating Instructions Manual page 18

SFC COMBI BOILERS SFC-99, SFC-125
Figure 6: Vertical Concentric Termination - Two Kits
Figure 7: Vertical Concentric Termination - Single Kit
DIRECT VENT CONCENTRIC ROOF TOP TERMINATION
Roof Top Concentric Termination kits are approved for use with this unit.
For vertical roof top concentric terminations, you must follow the installation
instructions supplied with the venting material manufacturer. Care must be taken
to install the termination kit a minimum horizontal distance of 10' (305cm) away
from any portion of the building and a minimum of 18" (46cm) above the roof line
plus the anticipated snow line (see Figures 6 and 7).
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INSTALLATION AND OPERATION INSTRUCTIONS