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LENNOX HEARTH PRODUCTS • MERIT PLUS
ELECTRICAL INLET
5-1/2
(140)
OUTSIDE AIR
9-3/8
SHUTTER
(238)
8-15/16
GAS INLET
(227)
(See Also
)
Right Side View
ELECTRICAL
INLET
(Optional)
Left Side View
M
d o
l e
MPB33
MPB35
MPB40
MPB45
Figure 12 - Fireplace Specifications
STEP 2. ROUTING GAS LINE
Route a 1/2" (13 mm) gas line as shown in Figure
13. Gas lines must be routed, constructed and
made of materials that are in strict accordance
with local codes and regulations. The appliance,
as set up at the factory, is best suited for use
with a gas line routed from the left side. The gas
line may however be alternately routed from the
right side. All appliances are factory-equipped
with a flexible gas line connector and 1/2" shutoff
(see Step 6 on Page 12).
valve
Pipe Coupling
(Recommended)
3"
(76 mm)
Also see Figure 11.
Figure 13 - Gas Line Routing
B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
®
FRAMING
STANDOFFS
(Top, Sides,
and Rear)
(See Also
Right Side View )
A
3
1-3/8
(76)
(35)
7-3/8
(187)
N
. o
A
B
30-1/8
in.
33-1/8
mm
841
765
. n i
5 3
1 -
8 /
2 3
1 -
8 /
m
m
8
2 9
8
6 1
. n i
0 4
1 -
8 /
7 3
1 -
8 /
m
m
0 1
9 1
9
3 4
. n i
0 4
1 -
8 /
7 3
1 -
8 /
m
m
1 1
6 4
9
3 4
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, ANSI
Z223.1 (NFPA 54) - latest edition (USA) or CAN/
CGA-B149.1 - latest edition (Canada).
Never use galvanized or plastic pipe. Refer to
Table 6 for proper sizing of the gas supply
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 qualified individual such as a plumber
or gas fitter 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,
6-1/2"
pressure, sediment, and more. Certainly no one
(152 mm)
unfamiliar and unqualified should attempt sizing
or installing gas piping.
NOTES:
• All appliances are factory-equipped with a
flexible gas line connector and 1/2" shutoff
valve (see Figure 21 on Page 13).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
F
G
H
J
T op View
3 (76)
E
C
B
D
Front View
C
D
E
F
21-1/2
17
33-1/8
27-1/2
432
699
841
546
24-7/8
9 1
9 2
1 -
2 /
5 3
1 -
8 /
-
8 /
4
3 8
7
9 4
8
2 9
621
6
2 3
4 2
4 3
1 -
2 /
0 4
1 -
8 /
9 2
7 -
8 /
6
0 1
8
6 7
0 1
9 1
7
9 5
4 2
9 3
1 -
2 /
5 4
1 -
8 /
4 3
7 -
8 /
6
0 1
0 1
3 0
1 1
6 4
8
6 8
Flue Outlet For B-V ent Connection
NOTE - Hood shown
ELECTRICAL INLET
as positioned
2-3/4 x 2 (70 x 51) COVER
PLA TE with KNOCKOUT)
in louvered
front model.
1/2 (13)
GAS INLET
(Either Side
and bottom )
OPTIONAL ELECTRICAL
INLET KNOCKOU T
REQUIRING A FIELD
PROVIDED JUNCTION
BOX (Either Side)
3 (76)
1-3/8
(35)
Right Side View
K
H
J
G
10-3/4
4
6-1/2
13
273
102
165
330
12-7/16
- 2
/ 7
6 1
5
8-3/4
16
3
6 1
1
7 2
222
406
1
4
1 -
/ 5
6 1
5
8-3/4
16
3
9 7
1
7 2
2
22
406
1
- 7
/ 7
6 1
6
8-3/4
16
4
3 4
1
2 5
222
406
Schedule 40 - Black Iron Pipe
Inside Diameter (Inches)
Schedule 40 Pipe
Length (feet)
0 - 10
10 - 40
40 - 100
100 - 150
150 - 200
Table 6
• 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 on
Page 12).
• 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.
• Check with local building official for local code
requirements.
K
5-1/2
(140)
9-3/8
(238)
2
(53)
Natural
Propane
Gas
Gas
1/2"
3/8"
1/2"
1/2"
1/2"
1/2"
3/4"
1/2"
3/4"
1/2"
9
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