Install Instructions (Venting)

2.0 Direct Vent Installation of Vent/Air Piping
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Vent Termination
[30.5 cm to 61 cm]
12" Min. - 24" Max
Above Combustion
Air Inlet
Combustion Air Termination
Direct Vent - Vertical Termination of Vent and Combustion Air Piping.
Fig. 1:
6. The vent termination must also maintain the follow-
ing clearances; as shown in Fig.2.
a. At least 3 feet [0.9 m] from adjacent walls
b. At least 3 feet [0.9 m] below roof over hangs
c. At least 7 feet [2.1 m] above any public walk-
ways
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. No closer than 12” [30.5 cm] 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 inches [30.5 cm] horizontal spacing
from other fan assisted appliance vents such as
clothes dryer vent, kitchen exhaust vent etc. Never
terminate the vent above or below any fan assist-
ed vent within 12 inches [30.5 cm] horizontally.
7. Locate the vent and combustion air terminations in a
manner to protect from damage by foreign objects,
such as stones, balls, or buildup of leaves or sediment.
8. Do not connect any other appliance to the vent pipe
or multiple boilers to a common vent pipe.
2.1.2 Direct Vent - Vent Installation - Through the
Roof
1. Vent and Combustion Air Penetration
- Vent pipe penetration through combustible or
non-combustible wall material should maintain a
minimum 1/4” [6 mm] clearance for 3” and 4”
PVC/CPVC vent or 1” [2.5cm] for 2” PVC/CPVC
vents. The diameter of the penetration hole
should be 4” [10.2 cm] minimum for 2” and 3”
pipe or 5” [12.7 cm] minimum for 4” pipe. When
using Polypropylene or Stainless Steel Vent
refer to vent manufacture’s installation instruc-
tions, supplied with the vent for clearances.
- Combustion air pipe penetration can maintain
zero clearance. The diameter of the penetration
hole should be 2-3/8” [6 cm] minimum for 2” pipe
or 3-1/2” [8.9 cm] minimum for 3” pipe or 4-1/2”
[11.4 cm] minimum for 4” pipe.
2. The installer must use a galvanized metal thimble for
the vent pipe penetration.
3. Locate the vent and combustion air pipe penetra-
tions to provide clearances as described in Fig. 1 on
page 14.