Manual
Installing Vent Termination Kit
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Locate the vent and combustion air termination using the
following guidelines:
1. The total length of the vent or combustion air piping
must not exceed the limits given in Table 1 on page 13.
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2. The concentric vent/air assembly must terminate
vertically and must be located 12 inches minimum
above the projected snowline with a maximum of 24
inches above the roof as shown in Fig. 2.
3. The vent and combustion air piping connected to the
concentric vent/air assembly must comply with the
instructions listed in this supplement.
4. The following should be considered when determin-
ing the location of the vent and combustion air ter-
mination:
a. Locate the vent termination where flue vapors
will not damage surrounding shrubs, plants or
air conditioning equipment or be objectionable
to the homeowner.
NOTICE
WARNING
NOTICE
b
. The flue products will form a noticeable plume
as they condense in colder air. Avoid terminat-
i
ng 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-
r
ounding plants, building surfaces or combus-
tion air inlet.
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 or guard 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.
Vent Piping
(Field Supplied)
Air Piping
(Field Supplied)
Concentric
Vent/Air
Termination Kit
Support Bracing
(Field Supplied)
Optional
Galvanized
Metal Thimble
(Field Supplied)
Roof Flashing
and Boot
(Field Supplied)
Combustion
Air Inlet
Vent Outlet
12" Min. Above the
Snowline. Max.
Allowable Height is
24" above the roof.
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