Sterling QVSB - Manual (Page 3)

Select location on roof for vent terminal, ensuring adequate space inside for concentric vent box.
Terminal must be at least 6 feet from any wall or adjoining building. See fi gure 3.
Cut hole through roof for 8 inch combustion air pipe. Fasten length of 5 inch pipe to exhaust connection
of concentric adapter with sheet metal screws. Use at least three screws per joint. Seal all joints
with high temperature silicone sealant. Concentric adapter box is to be suspended from the under-
side of the roof using suitable brackets (fi eld supplied). Before mounting box, cut length of 8 inch
pipe so that dimension A, fi gure 4 step 1, is equal to the roof thickness plus 18 inches or the roof
thickness plus the expected snow depth, whichever is greater. Fasten 8 inch pipe to combustion air
inlet connection of concentric adapter and seal joint. Add additional 5 inch pipe to extend at least
20 inches above top of 8 inch pipe.
3
Figure 3. Vertical Concentric Venting
Figure 2. Vertical Termination