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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
9
45"
(1143 mm)
31-9/16"
(802 mm)
21-1/4"
(540 mm)
8-3/16"
(208 mm)
Top View
Right Side
Gas Line
Access
Junction
Box
Combustion
Air Inlet
9-7/8"
(251 mm)
43"
(1092 mm)
21-1/4"
(540 mm)
43"
(1092 mm)
21-1/4"
(540 mm)
Left Side
45"
(1143 mm)
Front View
43"
(1092 mm)
7-3/16"
(183 mm)
41"
(1041 mm)
2"
(51 mm)
12-1/2"
(318 mm)
22-5/16"
(566 mm)
13-7/16"
(341 mm)
8-3/8"
(213 mm)
Fireplace Top Spacer
Fireplace
Top Spacer
Gas Line
Access
19"
(483 mm)
10"
(254 mm)
12 ¹⁄₂"
(318 mm)
47"
(1194 mm)
1"
(25 mm)
38"
(965 mm)
FIREPLACE SPECIFICATIONS - MODEL MP-42OD
Figure 18
Notes
Due to Lennox' ongoing commitment to quality,
all specifi cations, ratings and dimensions are
subject to change without notice.
All framing dimensions calculated for 1/2" dry wall
at the fi replace face. If sheathing the chase or
fi nishing with other thickness materials, calcula-
tions will need to be made.
See Page 10 for Ceiling and Roof Framing
Dimensions
Diagrams & Illustrations Not to Scale
Fireplace Framing
Header
(See Note **
)
B
1
A
B
2
A
Outside Chase
G
C
H
I
nc
l
u
di
ng
Fi
n
i
s
i
ng
M
ater
i
a
l
s
if any
Rough
Framing Face
(Unfinished Shown)
Combustion
Air Kit - Optional
*
Framing Dimensions
A 46-1/2" 1181 mm
B
1
43-1/2" 1105 mm
B
2
60-1/2" 1537 mm
C 33" 828 mm
D 17-1/2" 445 mm
E 76-1/4" 1937 mm
F 38-1/8" 968 mm
G 21-5/8" 549 mm
H 20-5/8" 524 mm
J 53-7/8" 1362 mm
K 8" 203 mm
Outside Chase - Indoor Installations
Outside
Air Kit
G
A
Outside Chase
Back Wall of Chase/Enclosure
Including Finishing
Materials if any
Rough Framing Face
(Unfinished Shown)
Optional
Drainage
Line
**Note: When Framing With 6” Studs Header Must Be 17”
(432mm) Higher. Use Security Chimney’s OR15 Offset/Re-
turn Elbow To Recess The Chimney Back 2 1/2” (64mm).
Flat Frame Down To A False Header At (B
1
). Maintain
Required Clearance To Chimney At All Times.
* 1" Air Space to insulation and construction materials on the
back and sides.
OTL Report No. 116-F-37-2
Corner Installation
J
D
A
E
F
Back Wall of
Chase/Enclosure
Including Finising
Materials
if any
Rough
Framing Face
(Unfinished Shown)
OAK-OD Combustion
Air Kit
A
K
G
Inside Chase
Back Wall of Chase/Enclosure
Including Finishing Materials, if any.
Rough
Framing Face
(Unfinished Shown)
OAK-OD Combustion
Air Kit
Product Reference Information
Cat.
No.
Model Ship.
Weight
Ship.
Volume
H1934 MP-42OD 188 lb. 24 cu. ft.