10
139234_Rev_A 9.17.10
Vent Installation Procedure
This appliance must be vented through dual 3 inch
flexible gas aluminum liners listed for use with gas
appliances.
The co-linear installation includes a pair of 3 inch
flex ducts that run from the insert up through the
existing chimney.
One duct is attached to the exhaust port on the
back of the unit and will carry the exhaust gases to the
outside of the house. This exhaust liner must run the
full length of the chimney and be directly connected to
the chimney termination cap. See figure 8.
The other 3 inch liner will be attached to the air in-
take port on the back of the unit and will provide fresh
air for combustion to the unit. This liner must extend a
minimum of 6 feet off the back of the unit and extend
through the damper area of the fireplace and into the
tile liner of the chimney. This liner can also extend the
full length of the chimney and connect to the termina-
tion cap. See figures 8 and 9.
IMPORTANT
If the intake flex does not extend the full length
of the chimney and connect to the unit and the
termination cap - A METAL BLOCK OFF PLATE MUST
BE CONSTRUCTED AND INSTALLED ABOVE THE UNIT
BELOW THE END OF THE INTAKE DUCT (normally at
the damper area). See figure 8.
To avoid cross venting the insert, label the duct to
be used for the exhaust conduit at both the top and
bottom ends. This ensures that the exhaust duct will
be attached to the correct collar on the insert and on
the chimney termination kit.
CANADA NOTE: Both Intake and Exhaust ducts
must extend the full length of the chimney and be
connected to both the unit and the termination kit.
IMPORTANT NOTICE:
THE USE OF AN EXISTING CHIMNEY AS AN AIR
INTAKE IS NOT COVERED UNDER THE ANSI Z21.88-
1999-CSA 2.33-M99 TEST METHODS AND RESULTING
ITS/WHI PRODUCT CERTIFICATION. THE CODE
AUTHORITY HAVING JURISDICTION MUST BE
CONSULTED PRIOR TO PROCEEDING WITH THIS
INSTALLATION METHOD.
Vent Guidelines
• All vent components must be installed in accordance
with the terms of their listing and manufacturer’s
instructions.
• The minimum height of termination cap from the
top of the unit shall be no less than 10’, and the maxi-
mum height shall be no more than 40’. See figures 2
and 4.
• Steep roofs, nearby trees, or predominantly windy
conditions can promote weak draft or occasional
downdrafts. In such cases, increasing the height of
the vent or installation of high wind termination
caps may alleviate the condition.
• HORIZONTAL RUNS are not permitted anywhere in
the venting system.
• Venting liners CANNOT be less than 3” in diameter or
greater than 3” in diameter.
• Any unused flue or masonry enclosure can be used
as a passageway for venting PROVIDED the flue is
relined using 3” Listed Flexible Gas Liner.
• The remaining space around the liner in a masonry
or zero-clearance flue CANNOT be used to vent any
other appliance.
• Listed Flexible Gas Liners may not be exposed to any
living space.
• Installation of any components not manufactured
or approved by Scan or failure to meet all clearance
requirements will void all warranties and could result
in property damage, bodily injury, or loss of life.
• Never modify any venting component, or use any
damaged venting product.
• THE GAS APPLIANCE AND VENT SYSTEM MUST BE
VENTED DIRECTLY TO THE OUTSIDE OF THE BUILD-
ING, AND NEVER ATTACHED TO A CHIMNEY SERVING
A SOLID FUEL OR GAS BURNING APPLIANCE.
• The minimum vent height above the roof or adjacent
walls is specified by building codes. A general guide
to follow is the Gas Vent Rule below.
GAS VENT RULE
Flat to 6/12
1’0” 0.3M
Over 7/12 to 9/12
2’0” 0.6M
Over 10/12 to 12/12
4’0” 1.2M
Over 13/12 to 16/12
6’0” 1.8M
Over 17/12 to 21/12
8’0” 2.4M
Minimum Height
From Roof
ROOF SLOPE
