A.O. Smith 100 Series Installation And Operating Manual page 22

CONCENTRIC VENT TERMINATION
A concentric vent termination kit (see Table 11) may be used for vertical
or horizontal terminations. Figure 24 illustrates the concentric vent kit
for a horizontal (side wall) installation. To prevent rain water from
entering the exhaust outlet, slope the vent kit at a downward pitch
of 6 mm (1/4") per 1.5 m (5') away from the inside wall. Ensure the
combustion air intake location is above the anticipated snow level.
Figure 23 illustrates the concentric vent termination kit in a vertical
(roof) installation. Ensure the combustion air intake location is above
the anticipated snow level.
Table 11. Concentric Vent Termination Kits
Vent Dia.
2"
3"
ORIENTATION OF EXHAUST PIPING AND COMBUSTION
AIR PIPING RELATIVE TO EACH OTHER MAY BE HORI-
ZONTAL (AS SHOWN) OR AT ANY OTHER ANGLE TO SUIT
THE INSTALLATION.
P/N
100153586
100111100
Strapping
(field-supplied)
Slope:
6 mm (1/4")/1.5 m (5')
Elbow
(field-supplied)
Figure 24. Concentric Termination (Horizontal)
Combustion
Air
Flashing
(field-supplied)
Exhaust
Figure 23. Concentric Termination (Vertical)
Combustion
Air
Wall
22
Above Anticipated Snow
Level or 450 mm (18")
Minimum Above the Roof
Roof
Strapping
(field-supplied)
Elbow
(field-supplied)
Combustion Air
25 mm (1") Minimum