8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
All framing dimensions calculated for 1/2" dry wall at the appliance face. If sheathing the chase or finishing with other thickness materials,
calculations will need to be made.
*
Outside air kit - FOAK (without adaptor). See
Figure 23
on
Page 14.
*Optional FOAK
Outside
Air Kit
A
Outside Chase
G
C
J
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough Framing Face
(Unfinished Shown)
Header
B
A
Fireplace Framing
C
A
G
Inside Chase
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough
Framing Face
(Unfinished Shown)
H
H
Corner Installation
K
D
C
A
E
G
F
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough
Framing Face
(Unfinished Shown)
.
o
N
l
e
d
o
M
A
t
i
n
U
e
z
i
S
A
g
n
i
m
a
r
F
e
z
i
S
B
C
D
E
F
G
H
J
K
.
n
i
5
3
8
/
1
-
5
3
4
/
1
-
5
3
4
/
1
-
9
1
8
/
5
-
9
1
7
5
2
/
1
-
4
/
3
-
8
2
6
1
4
6
1
/
9
-
6
8
/
5
-
0
4
m
m
2
9
8
5
9
8
5
9
8
3
8
4
8
9
4
0
6
4
1
0
3
7
6
0
4
2
0
1
7
6
1
2
3
0
1
.
n
i
8
/
1
-
0
4
4
/
1
-
0
4
4
/
1
-
0
4
4
2
8
/
5
-
4
2
6
1
/
3
1
-
1
6
6
1
/
1
-
0
3
6
1
4
6
1
/
9
-
6
2
3
/
1
1
-
3
4
m
m
9
1
0
1
2
2
0
1
2
2
0
1
0
1
6
5
2
6
0
7
5
1
9
7
7
6
0
4
2
0
1
7
6
1
1
0
1
1
.
n
i
8
/
1
-
0
4
4
/
1
-
5
4
4
/
1
-
0
4
4
2
8
/
5
-
9
2
8
/
3
-
6
6
6
1
/
3
-
3
3
6
1
4
6
1
/
9
-
6
6
1
/
5
1
-
6
4
m
m
6
4
1
1
9
4
1
1
2
2
0
1
0
1
6
2
5
7
6
8
6
1
3
4
8
6
0
4
2
0
1
7
6
1
2
9
1
1
MPB33
MPB35
MPB40
MPB45
in.
mm
845
842
33-1/4
845
33-1/4
546
21-1/2
286
11-1/4
1232
48-1/2
616
24-1/4
330
13
102
4
103
4-1/16
872
34-5/16
33-1/8
12-3/4
14-11/16
17-3/16
437
373
324
1146
45-1/8
24-7/8
29-7/8
34-7/8
886
759
632
30-11/16
7-1/16
7-1/16
7-1/16
179
179
179
Figure 11 - Framing Specifications
