Install Instructions (Venting)
28
3.0 Category IV Installation of Vent/Air Piping
3
. The vent pipe can terminate:
- Using a coupling as shown in Fig. 17.
- Using a 90º elbow as shown in Fig. 18.
The vent termination must be installed 12” [30.5 cm] min-
imum above grade / highest anticipated snow level.
Do not extend the vent pipe outside the sidewall
beyond the dimensions shown in Figs. 17 & 18.
Extended exposure of the vent pipe could cause
condensate to freeze and block the vent pipe.
4. The following should be considered when determin-
ing the location of the vent termination:
a. Locate the vent termination where flue vapors
will not damage surrounding shrubs, plants or
air conditioning equipment or be objectionable
to the homeowner.
b. The flue products will form a noticeable plume
as they condense in colder air. Avoid terminat-
ing the vent in areas where the plume could
obstruct window views.
c. Prevailing winds could cause freezing of flue
condensation and a buildup of water / ice on sur-
rounding plants or building surfaces.
d. Avoid locations where prevailing winds could
affect the performance of the boiler or cause
recirculation of the flue gases, such as inside
corners of buildings or near adjacent buildings
or vertical surfaces, window wells, stairwells,
alcoves, courtyards, or other recessed areas.
e. Do not terminate the vent above any doors or
windows: flue condensate could freeze causing
ice formations.
f. Locate the vent termination to prevent possible
condensate damage to exterior finishes.
g. Avoid locations of possible accidental contact of
flue vapors with persons or pets.
5. The vent termination must also maintain the follow-
ing clearances; as shown in Fig. 15 on page 26.
a. At least 3 feet [0.9 m] from adjacent walls
b. At least 3 feet [0.9 m] below roof overhangs
c. At least 7 feet [2.1 m] above any public walk-
ways
WARNING
d
. At least 3 feet [0.9 m] above any forced air
intake within 10 feet [3 m].
e. No closer than 4 feet [1.2 m] below or horizon-
tally from any door or window or gravity air inlet.
f. Must be at least 4 feet [1.2 m] from any electric
meters, gas meters-regulators, relief valves or
other equipment. Never terminate the vent
above or below any of these items within 4 feet
[1.2 m] horizontally.
g. A minimum 12” [30.5 cm] or a maximum 24” [61
cm] beyond the exterior wall.
7. Locate the vent termination in a matter to protect
from damage by foreign objects, such as stones or
balls or subject to buildup of leaves or sediment.
8. Do not connect any other appliance to the vent pipe
or multiple boilers to a common vent pipe.
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Vent Termination
Category IV - Sidewall Termination of
Vent Pipe with Coupling Termination
Fig. 17:
12" [30.5 cm] Min.
Above Grade / Highest
Anticipated Snow Level
1
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Vent Termination
Category IV - Sidewall Snorkel
Termination of Vent Pipe with 90º Elbow
Termination
Fig. 18: