Install Instructions

4
h. Locate the vent and combustin air termina-
tions in a manner to protect from damage by
foreign objects, such as stones, balls, or
buildup of leaves or sediment.
3. Maintain the following clearances to the termi-
nation:
a. At least 3 feet [0.9 M] from adjacent walls
b. No closer than 3 feet [0.9 M] below roof
overhangs
c. At least 7 feet [2.1 M] above any public
walkways
d. At least 3 feet [0.9 M] above any forced air
intake within 10 feet [3 M] (does not apply
to the combustion air inlet of a direct vent
appliance).
e. Must be at least 4 feet [1.2 M] (6 feet [1.8 M]
Canada) from any electric meters, gas meters,
gas meter-regulators, relief valves or other
equipment. Never terminate above or below
any of these items within 4 feet [1.2 M] (6 feet
[1.8 M] Canada) horizontally.
f. No closer than 12” [ 30.5 cm] below or hor-
izontally from any door or window or grav-
ity air inlet.
g. Horizontal air intake must terminate at least
12 inches above grade (18” [45.7 cm]
Canada) or anticipated snow line as shown
in Fig. 5, page 5.
Vent/Air System Installation
SECTION II - Vent/Air System
Installation
Vent/Air System Clearance Requirements
The vent/air system may maintain zero clearance to
combustible & non-combustible materials.
Determine Termination Location
1. The maximum equivalent length of the concen-
tric vent/air system should not exceed 60Ft
[18.3 M] (excluding the termination). For each
90º elbow in the system, the equivalent length is
reduced by 10 feet [3 M] . For each 45º elbow
in the system, the equivalent length is reduced
by 5 feet [1.5 M] .
2. The installer must consider the following
when determining the location of the vent/air
system termination:
a. Locate the termination where flue vapors
will not damage surrounding shrubs, plants
or air conditioning equipment or be objec-
tionable to the homeowner.
b. The flue products will form a noticeable
plume as they condense in colder air. Avoid
terminating in areas where the plume could
obstruct window views.
c. Prevailing winds could cause freezing of
flue gas condensation and a buildup of
water/ice on surrounding plants, building
surfaces or combustion air inlet.
d. Avoid locations of possible accidental con-
tact of flue vapors with persons or pets.
e. Avoid locations where prevailing winds
could affect the performance of the appli-
ance or cause recirculation of the flue gases,
such as inside corners of buildings or near
adjacent buildings or vertical surfaces, win-
dow wells, stairwells, alcoves, courtyards,
or other recessed areas.
f. Do not terminate above any doors or win-
dows; flue condensate could freeze causing
ice formations.
g. Locate the termination to prevent possible
condensate damage to exterior finishes.
Fig. 4: Termination Clearances of Direct
Vent Systems
[
3
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5
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[
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[
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