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LENNOX HEARTH PRODUCTS • MERIT PLUS
Framing
M
d o
l e
N
. o
A
. n i
3 3
1
4 /
33 1/4
MPDT33
845
m
m
. n i
33 1/4
33 1/4
MPDR33
m
m
845
. n i
5 3
1
4 /
5 3
MPD35
m
m
8
5 9
. n i
0 4
1
4 /
0 4
MPD40
m
m
0 1
2 2
. n i
5 4
1
4 /
0 4
MPD45
m
m
1 1
9 4
Diagrams, illustrations and photographs are not to scale. Consult installation
instructions. Product designs, materials, dimensions, specifi cations, colors,
and prices are subject to change or discontinuance without notice.
Thermal Effi ciency (%)
Natural Gas
Fireplace
AFUE
EnerGuide
Model
(P4)
MPDT33
62
45
MPDR33
61
53
MPD35
62
53
MPD40
67
59
MPD45
67
59
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 in. x 10 1/2 in. (267 mm x 267 mm) inside dimensions, about this center mark (see Figure 20).
Top View
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 MPDT33 and MPDR33 models.
M
d o
l e
N
. o
A
. n i
3 3
1
MPD33
m
m
8
1 4
. n i
5 3
1
MPD35
m
m
8
2 9
. n i
0 4
1
MPD40
m
m
0 1
9 1
. n i
0 4
1
MPD45
m
m
1 1
6 4
Figure 12: Fireplace and Framing Specifi cations
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
B
C
D
E
—
37 3/4 12 7/8
845
—
959
327
19 5/8
—
12 7/8
845
498
—
327
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
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
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
Propane
AFUE
EnerGuide
(P4)
64
49
64
55
60
55
67
60
67
59
Based on CSA P.4.1-09
Front View
Concentric Flue:
Flue 4-1/2 in. (114 mm);
Combustion Air
7-1/2 in. (190 mm).
See Notes [1] and [2].
A
J
B
C
D
8 /
0 3
1
8 /
7 1
7 2
1
2 /
3 3
7
5 6
4
2 3
6
9 9
8 /
2 3
1
8 /
9 1
9 2
1
2 /
5 3
8
6 1
4
3 8
7
9 4
8 /
7 3
1
8 /
4 2
4 3
1
2 /
0 4
9
3 4
6
0 1
8
6 7
8 /
7 3
1
8 /
4 2
9 3
1
2 /
5 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
VENT FRAMING:
REAR VENT WITH
NO ELBOWS
B
A
1/2
A
3 (76)
E
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
1
8 /
1 2
1
/ 1
6 1
4 2
7
8 /
1
8
2 9
5
1 5
6
2 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
1
8 /
6 2
1
/ 1
6 1
4 3
7
8 /
7 1
1 1
6 4
6
8 7
8
6 8
10-1/2
(
)
267
7
(178)
5-1/8
(130)
7
(178)
5-1/8
(130)
D
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 7
1
3 7
6 7
2
2 1
2
/ 7
6 1
9
3
9
3
6 1
2
0 2
6 7
2
0 2
1
/ 5
6 1
9
3
9
3
9 7
2
0 2
6 7
2
0 2
/ 7
6 1
9
3
9
4
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 3
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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