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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Vent Size
Co-axial DV
Vent Size
4-1/2" Inner
7-1/2" Outer
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
8” / 11”
Vent / Intake
Fireplace Dimensions
Model
No.
A B C D E F G H J
LSM40-PV
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
LSM45-PV
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 photographs
are not to scale – consult installation
instructions. Product designs, materi-
als, dimensions, specifications, colors
and prices are subject to change or
discontinuance without notice.
* C = Adaptor Plus 4 Feet Vertical Vent (Min.) and 90° Elbow
Figure 8
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS
FIREPLACE AND FRAMING SPECIFICATIONS
Framing Dimensions
Model No. A B C *
LSM40-PV
in. 50-3/4 43 139-1/8
mm 1289 1092 3534
LSM45-PV
in. 56-7/8 48 144-1/8
mm 1445 1219 3661
A
B
C
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
1/2 A
10-1/2
(267)
7
(178)
5¹⁄₈
(130)
12-1/8
(308)
Adaptor Plus 4
Feet Vertical
Vent (Min.)
and 90° Elbow