15
SST Extreme X & SST Extreme S MODULATING I&O Manual
RD: JAN 2021
RL: 1A
Vertical vent through the roof (Category I)
:
It is the sole responsibility of the installer to adhere to all current local codes and/or ANSI Z223.1 /
CSA.B149.1 latest editions for all venting requirements, and practices. Also adhere to instructions
below, and the instructions of the vent manufacturer. Use vent materials certified for Category I.
All models of this series heater are certified Category I for vertical venting. See FIG. 5.
◼
The vent must extend at least 5 feet above the flue collar of the highest connected heater
◼
USA: Horizontal run of single wall vent or vent connector
(“
H
”
in FIG 5) must not exceed 75%
of the vertical height of the vent. If it does, then the vent system must be for Category III.
◼
Inputs up to 170,000 Btuh vertical vent can be
4”
diameter Type B
-
Vent; greater than 170,000
Btuh must use
5”
diameter Type B
-
Vent
◼
A vent connector must be secured to the flue collar using quantity 3 x #8 x
1/2”
sheet metal
screws
◼
A horizontal vent connector shall be installed and supported without any dips or sags and
shall slope upward toward the vent or chimney at least 1/4 in./ft.
◼
Use a certified termination cap as supplied by the manufacturer of the vent
◼
When vent and combustion air are taken through the roof, the exhaust vent should always
terminate higher than the combustion air intake, to prevent recycling the products of combus-
tion back into the heater
◼
The vent must extend at least 2 feet
above the highest point where it passes
through a roof. The vent must also ex-
tend at least two feet higher than any
portion of a building within a horizontal
distance of 10 feet.
◼
Keep vent connector runs as short as
possible with a minimum number of el-
bows. Refer to the current edition of AN-
SI Z223.1 (NFPA 54)or CSA
-
B149 in-
stallation codes for maximum length of
horizontal vent and vent connector.
◼
Total length of the vent connector and
vent pipe cannot exceed the values in
Table 4 above.
◼
A single
-
wall vent connector shall not be
insulated.
◼
For single
−
wall vent clearance to com-
bustibles is 6" except where a listed
clearance thimble is used.
Clearance to combustible material
for Type B
-
Vent or factory
-
built
vent per the vent manufacturer
’
s
instructions.
FIGURE 7: VERTICAL VENT
