11
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT
®
PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
G
H
Top View
(Louvered Front Model Shown)
Concentric Flue:
Flue 4-1/2" (114 mm);
Combustion Air
7-1/2" (190 mm).
See Notes [1] and [2].
Rear/Side
Framing
Spacers
Notes:
[1] MPD models have a top and rear vent. MPDR models
have a rear vent only. MPDT models have a top vent only.
[2] Collars protrude one inch on MPDT-3328 and MPDR-3328 models.
J
F (rear vent
models only)
N
1/2 (13)
1-5/8 (42)
L
K
NOTE: Eyebrow hood
shown as positioned
in louvered front model.
Gas Inlet (either
side and bottom)
Electrical Inlet
2-3/4" x 2"
(70 x 51 mm)
Cover Plate
with Knockout
Right Side View
M
See Note [2].
6 (152)
1-3/8 (35)
Optional Electrical Inlet
Knockout requiring a
Field-Provided Junction
Box (either side)
E
B
D
C
Front View
3 (76)
A
Header
Spacing
Top
Standoffs
A
B
D
7
(178)
5-1/8
12-1/8
(308)
10-1/2
(
267
)
C
VENT FRAMING:
TOP VENT WITH ONE
90
°
ELBOW
VENT FRAMING:
REAR VENT WITH
NO ELBOWS
Framing should be
constructed of 2x4
or larger lumber.
Inches (mm)
E
(130)
(130)
7
(308)
(178)
1/2
A
5-1/8
12-1/8
Dimension “E” is the required framing depth when the
finish material (drywall) thickness is 1/2 in. (13mm).
.
o
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d
o
M
A
B
C
D
E
8
2
3
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2
1
m
m
5
4
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5
4
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m
m
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m
m
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0
1
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n
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m
m
2
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1
m
m
9
4
1
1
2
2
0
1
8
7
6
7
3
1
1
6
0
4
FIREPLACE ANd FRAMING SPECIFICATIONS
Vent Size
Coaxial dV Vent Size
4-1/2" Inner; 7-1/2" Outer
Vertical Venting through the Ceiling
Frame ceiling opening: Use a plumb line from the ceiling
above the appliance to locate center of the vertical run. Cut
and/or frame an opening, 10-1/2" x 10-1/2" (267 mm x 267 mm)
inside dimensions, about this center mark
(see Figure 18)
.
Notes
diagrams, illustrations and photographs are not to scale. Consult installation
instructions. Product designs, materials, dimensions, specifications, colors,
and prices are subject to change or discontinuance without notice.
Efficiencies %
Fireplace
Model
Natural Gas
Propane
AFUE
EnerGuide
(P4)
AFUE
EnerGuide
(P4)
MPdT-3328
62
45
64
49
MPdR-3328
61
53
64
55
MPd-3530
62
53
60
55
MPd-4035
67
59
67
60
MPd-4540
67
59
67
59
Viewable Glass Size
33" Model
27-1/2" Wide
17" High
35" Model
29-1/2" Wide
18-7/8" High
40" Model
34-1/2" Wide
24" High
45" Model
39-1/2" Wide
24" High
Figure 13
Framing
.
o
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l
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M
A
B
C
D
E
F
G
H
J
K
L
M
N
8
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1
1
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3
/
2
2
3
1
m
m
1
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6
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9
6
1
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8
9
4
6
4
5
3
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2
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1
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1
2
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3
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3
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1
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1
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m
m
2
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1
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2
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8
1
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5
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6
1
3
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1
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1
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5
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3
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1
m
m
9
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1
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1
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1
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7
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3
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1
m
m
6
4
1
1
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3
0
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4
1
1
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4
