Install Instructions

103448-02 - 6/13 21
Figure 4: Location of Vent Terminal Relative to Windows, Doors, Grades, Overhangs, Meters and Forced Air
Inlets (Concentric Terminal Shown - Two-Pipe System Vent Terminal to be installed in same location -
Two-Pipe System Air Intake Terminal Not Shown)
IV. Venting A. General Guidelines (continued)
b. Maintain the correct clearance and orientation
between the vent and air intake terminals.
i. The centerlines between the vent and air
intake terminals must be spaced a minimum
of 12” apart. More than 12” spacing is
recommended.
ii. If possible, locate air intake and vent
terminations on the same wall to prevent
nuisance shutdowns. However, boiler may
be installed with vertical venting and sidewall
combustion air inlet or vice versa where
installation conditions do not allow for alternate
arrangement.
iii. The vent and air intake terminations may be
at varying heights when installed on the same
wall, but the height of the vent termination
should always be higher than the air intake
termination and within the specied limit as
shown in Figure 9B.
c. The bottom of the vent and air intake terminal must
be at least 12” (18” in Canada) above the normal
snow line. In no case should they be less than 12”
above grade level.
d. The bottom of the vent terminal must be at least 7
feet above a public walkway.
e. Do not install the vent terminal directly over
windows or doors.
f. The bottom of the vent terminal must be at least
3 feet above any forced air inlet located within 10
feet.
g. A clearance of at least 4 feet horizontally must
be maintained between the vent terminal and
gas meters, electric meters, regulators, and relief
equipment. Do not install vent terminal over this
equipment.
h. Do not locate the vent terminal under decks or
similar structures.
i Minimum twelve (12) inches vertically from any
roof overhang twelve (12) inches or less wide.
If a roof overhang width exceeds twelve (12) inches
the terminal vertical clearance must be increased
to avoid ue vapor condensation.
j. Top of vent terminal must be at least 5 feet below
eaves, softs, or overhangs. Maximum depth of
overhang is 3 ft.
k. If window and/or air inlet is within four (4) feet of
an inside corner, then terminal must be at least six
(6) feet from adjoining wall of inside corner.
l. Concentric - Minimum twelve (12) inches
horizontally from a building corner.
m. Under certain conditions, water in the ue gas may
condense, and possibly freeze, on objects around
the terminal including on the structure itself. If
these objects are subject to damage by ue gas
condensate, they should be moved or protected.