10
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
Figure 11 - Fireplace and Framing Specifications
E
A
B
D
Top View
Front View
5-3/32 (129)
Right Side View
14-1/8
8-1/2”
(216)
5-1/4”
(133)
(359)
26-15/32
(672)
C
25-29/32
(658)
25-1/2
(648)
7
2-1/2 (64)
(178)
19-5/8
(498)
Gas Inlet
(This
Side
Only)
Electrical
Inlet
8-3/8
(213)
F
G
H
J
Fireplace Dimensions
Model
No.
A
B
C
D
E
F
G
H
J
MDLX40
in.
50-5/8
37-1/4
42-7/8
25-5/16
34
37-5/8
33-3/32
29-9/32
34-3/4
mm
1286
946
1089
643
864
956
840
744
883
MDLX45
in.
56-11/16
42-1/4
47-7/8
28-3/8
40-1/8
43-5/8
38-3/32
34-1/2
40-59/64
mm
1440
1073
1216
721
1019
1108
968
876
1039
Notes
Diagrams, illustrations and photo-
graphs are not to scale - consult
installation instructions. Product
designs, materials, dimensions,
specifications, colors and prices are
subject to change or discontinuance
without notice.
Vent Size
Coaxial DV
Vent Size
8" Inner
11" Outer
Framing Dimensions
Models
A
B
C
MDLX40
in.
50-3/4
43
75-1/8
mm
1289
1092
1908
MDLX45
in.
56-7/8
48
80-1/16
mm
1445
1219
2034
A
B
C
8-1/2
(216)
13
(
330
)
VENT FRAMING
TOP VENT WITH 2 FEET
VERTICAL VENT AND
ONE 90° ELBOW
Framing should be constructed
of 2x4 or larger lumber.
Inches (mm)
(641)
25-1/4
15
(
381
)
6-1/2
(165)
1/2 A
PIPE CENTERLINE
A
B
C
8-1/2
(216)
13
(
330
)
VENT FRAMING
TOP VENT WITH 2 FEET
VERTICAL VENT AND
ONE 90° ELBOW
Framing should be constructed
of 2x4 or larger lumber.
Inches (mm)
(641)
25-1/4
15
(
381
)
6-1/2
(165)
1/2 A
PIPE CENTERLINE
Thermal Efficiency (%)
Natural Gas
Propane
Models
P4
P4
MDLX40
35.8
TBD
MDLX45
51.2
TBD
