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Hydronic Heating Boilers and
Domestic Water Heaters
12
INSTALLATION
Continued
FIG. 11 Vent Termination from Peaked Roof More Than 10’
From Ridge
FIG. 12 Vent Termination from Flat Roof 10’ or Less from
Parapet Wall
FIG. 13 Vent Termination from Flat Roof More Than 10’
from Parapet Wall
Sidewall Vent Termination Clearances and
Location
Locate the bottom of the vent terminal at least 12 inches (30cm)
above grade and above normal snow levels. Locate the bottom of
the vent terminal at least 7 feet (2.13m) above grade when
located adjacent to public walkways. Do not terminate directly
above a public walkway.
Do not terminate the venting system in a window well, stairwell,
alcove, courtyard, or other recessed area. Do not terminate the
venting system below grade.
Locate vent termination at least 3 feet (0.91m) from an inside
corner of an L-shaped structure.
Provide a minimum clearance of 4 feet (1.2m) horizontally from
electric meters, gas meters, regulators, and relief equipment.
Never locate vent cap above or below electric meters, gas meters,
regulators, and relief equipment unless a 4 foot (1.2m) horizontal
clearance is maintained.
Terminate the venting system at least 3 feet (0.9m) above any
forced air inlet within 10 feet (3.05m).
Terminate the venting system at least 4 feet (1.2m) below, 4 feet
(1.2m) beside, or 1 foot (30cm) above any door, window, or
gravity air inlet into any building.
Locate vent termination at least 8 feet (2.4m) horizontally from
any combustion air intake located above the sidewall termination
cap.
TAB
L
10' OR LESS
NOTE: NO HEIGHT
ABOVE PARAPET
REQUIRED WHEN
DISTANCE FROM
WALLS OR PARAPET
IS MORE THAN 10'.
CHIMNEY
3' MIN.
WALL OR
PARAPET
10' OR LESS
CHIMNEY
CHIMNEY
3' MIN.
2' MIN.
2' MIN.
WALL OR
PARAPET
10'
RIDGE
CHIMNEY
3' MIN.
2' MIN.
MORE THAN 10'
ƽ CAUTION: Units which are shut down or
will not operate may experience freezing due to
convective air flow in flue pipe, through the air
inlet, or from negative pressure in the
mechanical room. In cold climates, operate
pump continuously to help prevent freezing of
boiler water. Provide proper freeze protection.
See Freeze Protection, page 7.