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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. 18.
The vertical Type B-vent must extend at least 5 feet [1524 mm] above the flue collar of the
◼
highest connected heater.
USA: Horizontal run of single wall vent or vent connector ("H" in FIG. 18) must not exceed
◼
75% of the vertical height of the vent. If it does, then the vent system must be for Category III.
Single wall vent connector material must be corrosion-resistant galvanized steel with a mini-
◼
mum thickness specified in local code.
A vent connector must be secured to the flue collar using quantity 3 x #8 x 1/2" sheet metal
◼
screws. Seal penetrations and connections with high temperature RTV silicone sealant.
A horizontal vent connector shall be installed and supported without any dips or sags and
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shall slope upward toward the vent or chimney at least 1/4 in./ft (20 mm/m).
Use a certified termination cap as supplied by the manufacturer of the vent.
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When vent and combustion air are taken through the roof, the exhaust vent should always
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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 [610
◼
mm] above the highest point where it passes
through a roof. The vent must also extend at
least two feet higher than any portion of a
building within a horizontal distance of 10
feet [3 m].
Keep vent connector runs as short as possi-
◼
ble with a minimum number of elbows. Refer
to the current edition of ANSI Z223.1 (NFPA
54)or CSA-B149 installation codes for maxi-
mum length of horizontal vent and vent con-
nector.
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 in-
◼
sulated.
For single−wall vent clearance to combusti-
◼
bles is 6" [152mm] except where a listed
clearance thimble is used. Clearance to
combustible material for Type B-Vent or fac-
tory-built vent per the vent manufacturer's
instructions.
When an existing Category I heater is removed or replaced, the original venting system may
◼
no longer be sized to properly vent the attached appliances. Improperly sized venting sys-
tems can result in vent gas leakage or condensation.
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
FIGURE 18: VERTICAL VENT
32
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