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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).
.oNledoM A B C D E
8233-TDPM
.ni 4/133 4/133 ----- 4/373 8/721
mm 548 548 ----- 959 723
8233-RDPM
.ni 4/133 4/133 8/591 ----- 8/721
mm 548 548 894 ----- 723
0353-DPM
.ni 4/153 4/153 61/1112 4/393 61
mm 598 598 155 0101 604
5304-DPM
.ni 4/104 4/104 61/1162 4/344 61
mm 2201 2201 876 7311 604
0454-DPM
.ni 4/154 4/104 61/1162 4/344 61
mm 9411 2201 876 7311 604
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)
MP
DT
-3328 62 45 64 49
MPDR-3328 61 53 64 55
MP
D-3530
62 53 60 55
MPD-4035 67 59 67 60
MP
D-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
.oNledoM A B C D E F G H J K L M N
8233-TDPM
8233-RDPM
.ni 8/133 8/103 71 2/172 8/133 8/591 2/112 4/301 61/316 3 23/118 3/22 31
mm 148 567 234 996 148 894 645 372 371 67 212 07 033
0353-DPM
.ni 8/153 8/123 91 2/192 8/153 61/1112 8/742 1 61/72 9 3 9 3 61
mm 298 618 384 947 298 155 236 613 022 67 022 67 604
5304-DPM
.ni 8/104 8/173 42 2/143 8/104 61/1162 8/792 1 61/514 9 3 9 3 61
mm 9101 349 016 678 9101 876 957 973 022 67 022 67 604
0454-DPM
.ni 8/104 8/173 42 2/193 8/154 61/1162 8/743 61/771 9 3 9 3 61
mm 6411 349 016 3001 6411 876 688 344 022 67 022 67 604