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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
11
C
Back wall of chase/enclosure
(including any finishing materials)
D
A
B
Model No. A B C D
LSM40-PV
in. 50-5/8 83-5/8 59-1/8 41-7/8
mm 1286 2124 1502 1064
LSM45-PV
in. 56-3/4 89-7/8 63-1/2 44-7/8
mm 1441 2283 1613 1140
Figure 9 - Corner Framing with Power Vent Termination
Proper Sizing of Gas Line
Properly size and route the gas supply line
from the supply regulator to the area where the
appliance is to be installed per requirements
outlined in the National Fuel Gas Code, NFPA
54 - latest edition (USA).
Never use galvanized or plastic pipe. Refer
to Table 6 for proper sizing of the gas sup-
ply line, if black iron pipe is being used. Gas
lines must be routed, constructed and made
of materials that are in strict accordance with
local codes and regulations. We recommend
that a qualied individual such as a plumber or
gas tter be hired to correctly size and route
the gas supply line to the appliance. Installing
a gas supply line from the fuel supply to the
appliance involves numerous considerations of
materials, protection, sizing, locations, controls,
pressure, sediment, and more. Certainly no one
unfamiliar and unqualified should attempt sizing
or installing gas piping.
Notes:
• All appliances are factory-equipped with
a exible gas line connector and 1/2 inch
shutoff valve (see Figure 29 on Page 21).
• See Massachusetts Requirements on Page
4 for additional requirements for installations
in the state of Massachusetts in the USA.
• The gas supply line should Not be connected
to the appliance until Step 6 (Page 21).
• A pipe joint compound rated for gas should be
used on the threaded joints. Ensure propane
resistant compounds are used in propane
applications. Be very careful that the pipe
compound does not get inside the pipe.
• It is recommended to install a sediment
trap in the supply line as close as possible
to the appliance (see Figure 29 on Page 2).
Appliances using Propane should have a
sediment trap at the base of the tank.
• Check with local building ofcial for local
code requirements (i.e. are below grade
penetrations of the gas line allowed?, etc).
IMPORTANT: If propane is used, be aware that
if tank size is too small (i.e. under 100-lbs, if
this is the only gas appliance in the dwelling.
Ref. NPFA 58), there may be loss of pressure,
resulting in insufficient fuel delivery (which
can result in sooting, severe delayed ignition
or other malfunctions). Any damage resulting
from an improper installation, such as this,
is not covered under the limited warranty.
Schedule 40
Black Iron Pipe
Inside Diameter (Inches)
Schedule 40 Pipe
Length (feet)
Natural
Gas
Propane
Gas
0-10 1/2 3/8
10-40 1/2 1/2
40-100 1/2 1/2
100-150 3/4 1/2
150-200 3/4 1/2
Table 6
Right Side
Front Corner
Of Fireplace
Framing
6-1/4”
(159 mm)
19-5/8”
(498 mm)
Figure 10
Step 2. ROUTING GAS LINE
Route a 1/2" (13 mm) gas line along the inside
of the right side framing as shown in Figure
10. Gas lines must be routed, constructed and
made of materials that are in strict accordance
with local codes and regulations.
All appliances are factory-equipped with a
exible gas line connector and 1/2 inch shutoff
valve. (See Step 6 on Page 21).
The incoming gas line should be piped into the
valve compartment and connected in one of the
two methods as shown in Figure 29 on Page 21.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS