Lennox Hearth II-T C FS - Manual (Page 16)

INSTALLATION
Note: Greater back clearance will improve the ease of serviceability of the stove.
PAGE 16
INSTALLING YOUR FREESTANDING PELLET STOVE
Standard Horizontal Vent Installation
All PL Venting Components must be listed to UL 641
or ULC S609
1. Locate the proper position for the listed type “PL” wall
thimble. Avoid cutting wall studs when installing your
pipe. Use a saber saw or keyhole saw to cut the
proper diameter hole through the wall to accommo-
date the wall thimble. Use extreme caution to avoid
cutting into power lines within the wall of the home.
The hole size will depend on the brand of pellet vent
that you are using. Install the wall thimble in the hole.
2. ALL INTERLOCKING PIPE CONNECTIONS WITH-IN
THE ROOM MUST BE SEALED WITH HIGH TEM-
PERATURE RTV AND SECURED WITH A MINIMUM
OF 3 FASTENERS PER CONNECTION. Position the
stove approximately 12” (305 mm) from the wall on
the floor pad. Push the “PL” pipe through the wall
thimble. Squeeze a bead of high temperature silicone
(RTV) sealer around the end of the machined portion
of the 3” (76mm) pipe connector on the back of the
stove. Firmly push on a section of “PL” pipe until in-
ner pipe liner pushes into the bead of RTV sealer.
3. Push the stove with pipe attached towards the wall
(the pipe will go through the wall thimble). Do not
position the back of the stove closer than 2” (51mm)
from the wall (see clearances, page 6). Note:
Greater back wall clearance will improve the ease of
serviceability of the stove.
4. Install listed type “PL” 45 degree elbow with optional
rodent screen or cap (recommended) on outside end
of pipe. The rodent screen should be no less than
1/2” (13 mm) mesh and may clog with soot and ash if
left unattended during the burn season.
NOTE: The end of the exhaust pipe must extend a
minimum of 12” (305 mm) from the outside of the
building.
5. If the installation includes a source of outside com-
bustion air; cut a separate hole through the wall for
the fresh air tube. Use a galvanized or stainless steel
pipe for the duct. The minimum size for the duct
shall be not less than 50% of the cross sectional flue
area. Connect outside air pipe to air inlet on stove.
This tube must be terminated with a 45 degree elbow
or hood.
NOTES:
Combustion air may also be drawn from a vented crawl
space under the home.
All joints for connector pipe are required to be fastened
with at least three screws. If vented horizontally, joints
shall be made gas-tight (air tight, sealed connection) in a
manner as specified on this page (see instruction #2).
Install vent at clearances specified by the vent manufac-
turer.
Inlet Air
Port
Metal
Fresh Air
Pipe
45 Degree Elbow Joint
For Fresh Air Pipe
Hole Through the Wall for the Thimble Pipe Connector on Stove Wall T
himble
Use RTV High Temp Silicone
Hole
Through
the Wall for
the Fresh
Air Pipe
Use RTV High Temp Silicone
45
° Elbow
Horizontal l Pipe Use RTV High T
emp Silicone
Wall T
himble
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