Step 3. Install The Vent System - Lennox Montebello DLX Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO

Step 3. INSTALL THE VENT SYSTEM

General Information
These instructions should be used as a
guideline and do not supersede local codes
in any way. Install vent according to local
codes, these instructions, the current
National Fuel Gas Code (ANSI-Z223.1) in
the USA or the current standards of CAN/
CGA-B149.1 and -B149.2 in Canada.
Ensure clearances are in accordance
with local installation codes and the
requirements of the gas supplier.
Dégagement conforme aux codes
d'installation locaux et aux exigences du
foumisseunde gaz.
Use only approved venting
components. See Approved Vent
Components on Page 2.
These fireplaces must be vented
directly to the outside.
The vent system may not service multiple
appliances, and must never be connected to
a flue serving a separate solid fuel burning
appliance. The vent pipe is tested to be run
inside an enclosing wall (such as a chase).
There is no requirement for inspection
openings in the enclosing wall at any of the
joints in the vent pipe.
12
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
Installation of Vent Restrictor
A vent restrictor may be needed with this
appliance. The restrictor is installed in
the appliance top flue outlet as shown in
Figure 14,
For vertical venting from 6 feet to 12 feet
or more, from the top of the fireplace to the
top of the termination, the installation of a
vent restrictor is required.
If necessary, install a vent restrictor in the
appliance flue outlet as shown in Figure 14.
The vent restrictor is held in place by friction,
only.
Note: The restrictor is included within the
firebox.
When vertically terminating the vent system above
the roof, install a vent restrictor in the top vent of
the fireplace outlet.
Install the restrictor as shown from
inside the unit, in the inner fireplace collar.
APPLIANCE VENT OUTLET
Figure 14: Vent Restrictor Installation
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Select Venting System—Horizontal or Vertical
With the appliance secured in framing, de-
termine vent routing and identify the exterior
termination location. The following sections
describe vertical (roof) and horizontal (exterior
wall) vent applications. Refer to the section
relating to your installation. A list of approved
venting components is shown on Page 30.
RESTRICTOR