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LENNOX HEARTH PRODUCTS • MONTEBELLO
C
Back wall of chase/enclosure
(including any finishing materials)
Figure 9: Corner Framing with Power Vent Termination
Model No.
MDLX40IN-PV
MDLX45IN-PV
Table 10: Dimensions for Corner Framing with Power Vent Terminations
Figure 10: Right-Front Corner of
Fireplace Framing
DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS
®
A
B
A
B
in.
50 5/8
83 5/8
mm
1286
2124
in.
56 3/4
89 7/8
mm
1441
2283
Step 2. ROUTING GAS LINE
Route a 1/2 in. (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
flexible gas line connector and 1/2 in. shutoff
valve. (see Step 6 on Page 21).
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 (USA) National
Fuel Gas Code, ANSI Z223.1/NFPA 54—latest
edition, or (Canada) CAN/CSA-B149.1—
latest edition.
Never use galvanized or plastic pipe. Refer to
Table 11 for proper sizing of the gas supply
line, if black iron pipe is being used.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
D
C
D
59 1/8
41 7/8
1502
1064
63 1/2
44 7/8
1613
1140
Length
Inside Diameter
0–10 ft (0–3.1 m)
1/2 in. (12.7 mm)
10–40 ft (3.1–12.2 m)
1/2 in. (12.7 mm)
40–100 ft (12.2–30.5 m)
1/2 in. (12.7 mm)
100–150 ft (30.5–45.7 m)
3/4 in. (19.1 mm)
150–200 ft (45.7–61.0 m)
3/4 in. (19.1 mm)
Table 11: Schedule 40 Black Iron Pipe
Inside Diameter
Gas lines must be routed, constructed
and made of materials that are in strict
accordance with local codes and regulations.
We recommend hiring a qualified plumber
or gas fitter 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. Only
a qualified installer should attempt sizing or
installing gas pipe.
Notes:
• All appliances are factory-equipped with
a flexible gas line connector and 1/2 in.
shutoff valve (see Figure 30 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. Be
very careful that the pipe compound does
not get inside the pipe.
• Installing a sediment trap in the supply
line as close as possible to the appliance
is recommended.
• Check with local building official for local
code requirements.
11
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