Lennox Cascade Installation And Operation Manual page 10

Pipe/Liner Joint Requirements
Silicone sealant and three screws are required to secure the first vent
connection to the appliance flue collar. Secure and seal the remaining
vent sections per the vent manufacturers instructions. ALL horizontal
joints must be sealed gas-tight (air tight, sealed connection). Use RTV
high temperature silicone or Interam, if necessary, to provide a complete
seal between vent sections.
Connection to Masonry Chimney through a Wall
Be sure to verify the construction of a masonry chimney, as it may have
combustible framing.
Approved liner when relining Masonry or Factory Built Fireplaces is
2100HT (degree F.) liner listed to UL 1777 or ULC S635.
Connection to an Existing Class A Chimney
A chimney adapter can be used to make the connection from 3" (75
mm) or 4" (100 mm) pellet vent pipe (listed to UL 641 or ULC S609) to
existing UL chimney system. Verify with the pipe manufacturer that your
pipe brands will interconnect.
Horizontal Vent Installations
On all horizontal vent installations (short, horizontal runs with no vertical
pipe); care should be taken when choosing a location for terminating the
vent. It is not recommended to directly vent the exhaust on the prevailing
wind side of the house. It is recommended that when an appliance is
vented directly through a wall, a minimum of 8 feet (2.5 m) of vertical
pipe should be installed to create some natural draft. This will reduce
the possibility of smoke or odor entering the dwelling during appliance
shutdown or loss of power.
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Vent Termination
Do not terminate vent in an enclosed or semi-enclosed area such as:
carports, garage, attic, crawl space, under a deck, porch, narrow walkway,
closely fenced area, or any location that can build up a concentration of
fumes such as a stairwell, covered breezeway etc.
Vent surfaces can get hot enough to cause burns if touched. Adults
should supervise children when they are in the area of a hot stove.
Non-combustible shielding or guards may be required.
Termination Cap
The termination of the outside chimney of the pellet stove shall be located
in accordance with the following:
A. Higher than 3 feet (.92 m) above any forced air inlet (air conditioner,
etc.) located within 10 feet (3 m).
B. Not less than 4 feet (1.2 m) below, 4 feet (1.2 m) horizontally from or
1 foot (3.1 m) above any gravity air inlet (door, window, etc.) which
flue gases could reenter the dwelling.
C. Not less than 2 feet (.6 m) from combustible materials such as an
adjacent buildings, fences, protruding parts of the structure, roof
overhang, plants and shrubs, etc. and not less than 7 feet (2.1 m)
above grade when located adjacent to the public sidewalks (access).
The final termination of the exhaust system must be configured so that
flue gases do not jeopardize the safety of people passing by, overheat
combustible portions of nearby structures or enter the dwelling.
D. Not less than 3 feet (.92 m) below an eave (maximum overhang of 3
feet (.92 m) or any construction that projects more than 2" (51 mm)
from the plane of the wall.
E. The distance from the bottom of termination to grade is 12" (305 mm)
minimum. This is conditional upon plants and nature of grade surface:
Be careful to choose a location for the vent termination which does
not expose people or shrubs to high heat from the exhaust gases.
The exhaust gases are not hot enough to ignite grass, plants and
shrubs located in the vicinity of the termination although they should
be a minimum of 3 feet (.92 m) away. The grade surface under the
termination must not be a lawn.
F. Since sparks may escape from the exhaust pipe of any stove, use
caution when positioning the vent pipe. Refer to pipe manufacturer's
instructions when installing and terminating the exhaust. The vent pipe
should be horizontal and never run the pipe in a downward direction
(recommend a 1/4" [7 mm] rise per foot horizontal).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE