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LENNOX HEARTH PRODUCTS • MERIT
FIREPLACE ANd FRAMING SPECIFICATIONS
Framing
M
d o
l e
N
. o
A
. n i
3 3
1
4 /
M
P
D
- T
3 3
8 2
m
m
8
5 4
. n i
3 3
1
4 /
M
P
D
- R
3 3
8 2
m
m
8
5 4
. n i
5 3
1
4 /
M
P
- D
5 3
0 3
m
m
8
5 9
. n i
0 4
1
4 /
M
P
- D
0 4
5 3
m
m
0 1
2 2
. n i
5 4
1
4 /
M
P
- D
5 4
0 4
m
m
1 1
9 4
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.
Coaxial dV Vent Size
Efficiencies %
Natural Gas
Fireplace
EnerGuide
Model
AFUE
(P4)
MPdT-3328
62
45
MPdR-3328
61
53
MPd-3530
62
53
MPd-4035
67
59
MPd-4540
67
59
Top View
(Louvered Front Model Shown)
Rear/Side
G
Framing
H
Spacers
Header
Spacing
Top
Standoffs
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.
M
d o
l e
N
. o
. n i
3 3
M
P
D
- T
3 3
8 2
M
P
D
- R
3 3
8 2
m
m
8
M
P
- D
5 3
0 3
. n i
5 3
m
m
8
M
P
- D
0 4
5 3
. n i
0 4
m
m
0 1
M
P
- D
5 4
0 4
. n i
0 4
m
m
1 1
Figure 13
PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
B
C
D
E
3 3
1
4 /
- -
- - -
7 3
3
4 /
2 1
8
5 4
- -
- - -
9
9 5
3
7 2
3 3
1
4 /
9 1
5
8 /
- -
- - -
2 1
8
5 4
4
8 9
- -
- - -
3
7 2
5 3
1
4 /
1 2
1
/ 1
6 1
9 3
3
4 /
6 1
8
5 9
5
1 5
0 1
0 1
4
6 0
0 4
1
4 /
6 2
1
/ 1
6 1
4 4
3
4 /
6 1
0 1
2 2
6
8 7
1 1
7 3
4
6 0
0 4
1
4 /
6 2
1
/ 1
6 1
4 4
3
4 /
6 1
0 1
2 2
6
8 7
1 1
7 3
4
6 0
Notes
Vent Size
4-1/2" Inner; 7-1/2" Outer
Viewable Glass Size
Propane
33" Model
EnerGuide
AFUE
(P4)
35" Model
64
49
64
55
40" Model
60
55
67
60
45" Model
67
59
Front View
Concentric Flue:
Flue 4-1/2" (114 mm);
Combustion Air
7-1/2" (190 mm).
See Notes [1] and [2].
A
J
A
B
C
D
1
8 /
0 3
1
8 /
7 1
7 2
1
2 /
3 3
1 4
7
5 6
4
2 3
6
9 9
1
8 /
2 3
1
8 /
9 1
9 2
1
2 /
5 3
2 9
8
6 1
4
3 8
7
9 4
1
8 /
7 3
1
8 /
4 2
4 3
1
2 /
0 4
9 1
9
3 4
6
0 1
8
6 7
1
8 /
7 3
1
8 /
4 2
9 3
1
2 /
5 4
6 4
9
3 4
6
0 1
0 1
3 0
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
VENT FRAMING:
TOP VENT WITH ONE
90° ELBOW
7
8 /
VENT FRAMING:
REAR VENT WITH
NO ELBOWS
7
8 /
B
A
1/2
A
27-1/2" Wide
Vertical Venting through the Ceiling
17" High
Frame ceiling opening: Use a plumb line from the ceiling
29-1/2" Wide
above the appliance to locate center of the vertical run. Cut
18-7/8" High
and/or frame an opening, 10-1/2" x 10-1/2" (267 mm x 267 mm)
34-1/2" Wide
24" High
inside dimensions, about this center mark (see Figure 18).
39-1/2" Wide
24" High
NOTE: Eyebrow hood
3 (76)
E
shown as positioned
in louvered front model.
Gas Inlet (either
side and bottom)
Optional Electrical Inlet
Knockout requiring a
C
B
Field-Provided Junction
D
Box (either side)
E
F
G
1
8 /
9 1
5
8 /
1 2
1
2 /
0 1
8
1 4
4
8 9
5
6 4
2
1
8 /
1 2
1
/ 1
6 1
4 2
7
8 /
1
2
8
2 9
5
1 5
6
2 3
3
1
8 /
6 2
1
/ 1
6 1
9 2
7
8 /
1
4
0 1
9 1
6
8 7
7
9 5
3
1
8 /
6 2
1
/ 1
6 1
4 3
7
8 /
7 1
1 1
6 4
6
8 7
8
6 8
4
10-1/2
(
)
267
7
(178)
5-1/8
(130)
7
(178)
5-1/8
D
(130)
C
E
Dimension "E" is the required framing depth when the
finish material (drywall) thickness is 1/2 in. (13mm).
Right Side View
N
6 (152)
L
1-3/8 (35)
K
H
J
K
L
3
4 /
6
1
/ 3
6 1
3
8
1
/ 1
2 3
3 7
1
3 7
6 7
2
2 1
/ 7
6 1
9
3
9
6 1
2
0 2
6 7
2
0 2
1
/ 5
6 1
9
3
9
9 7
2
0 2
6 7
2
0 2
/ 7
6 1
9
3
9
3 4
2
0 2
6 7
2
0 2
Framing should be
constructed of 2x4
or larger lumber.
12-1/8
(308)
12-1/8
(308)
Inches (mm)
1/2 (13)
See Note [2].
F (rear vent
models only)
1-5/8 (42)
Electrical Inlet
M
2-3/4" x 2"
(70 x 51 mm)
Cover Plate
with Knockout
M
N
2
2
3 /
3 1
0 7
3
0 3
3
6 1
6 7
4
6 0
3
6 1
6 7
4
6 0
3
6 1
6 7
4
6 0
11
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