Table of Contents
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LENNOX HEARTH PRODUCTS • MONTEBELLO
VENT SECTION LENGTHS
Determine the number of straight vent
sections required. 4 1/2 in. (114 mm),
10 1/2 in. (267 mm), 22 1/2 in. (572 mm),
34 1/2 in. (876 mm) and 46 1/2 in.
(1181 mm) net section lengths are available
(see Table 14).
Offset Installation
Analyze the vent routing and determine
the quantities of vent sections and number
of elbows required. Refer to Figures 16
and 17 on Page 15 showing vent run
requirements to aid in selecting the type of
vertical installation desired. Vent sections are
available in net lengths of 4 1/2 in. (114 mm),
10 1/2 in. (267 mm), 22 1/2 in. (572 mm),
34 1/2 in. (876 mm) and 46 1/2 in.
(1181 mm). Refer to the Vent Section
Length Chart for an aid in selecting length
combinations. Elbows are available in 90°
and 45° configurations. Refer to Figure 15
on Page 14 for the SV4.5 E45 and SV4.5 E90
elbow dimensional specifications.
Where required, a telescopic vent section
(SV4.5LA) may be used to provide the
installer with an option in installing in tight
and confined spaces or where the vent run
made up of fixed length pieces develops a
joint in a undesirable location, or will not
build up to the required length. The SV4.5LA
Telescopic Vent Section has an effective
length of from 1 1/2 in. (38 mm) to 6 3/4 in.
(171 mm). The SV4.5LA is fitted with a
dimpled end (identical to a normal vent
section component) and a plain end with 3
pilot holes. Slip the dimpled end over the
locking channel end of a standard SV4.5 vent
component the required distance and secure
with three screws.
Maintain a minimum 1 in. (25 mm)
clearance to combustible materials for
all vertical elements. Clearances for all
horizontal elements are 3 in. (76 mm)
on top, 1 in. (25 mm) on sides and 1 in.
(25 mm) on the bottom.
Model
Effective Length
SV4.5L6
SV4.5L12
10 1/2 in.
SV4.5L24
22 1/2 in.
SV4.5L36
34 1/2 in.
SV4.5L48
46 1/2 in.
Table 13: Effective Vent Length
POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS
®
V
V
E
E
N
N
o
o
m
m
n i
n i
l a
l a
S
S
e
e
t c
t c
o i
o i
n
n
L
L
e
e
n
n
g
g
(
(
n i
n i
h c
h c
e
e
) s
) s
N
N
t e
t e
S
S
e
e
t c
t c
o i
o i
L
L
e
e
n
n
g
g
h t
h t
(
(
n i
n i
h c
h c
H
H
e
e
g i
g i
t h
t h
f o
f o
V
V
e
e
n i
n i
h c
h c
s e
s e
t f
t f
4
4
5 .
5 .
0
0
3 .
3 .
9
9
0
0
7 .
7 .
1
1
0
0
5 .
5 .
0
0
8 .
8 .
1
1
5
5
1
1
2 .
2 .
2
2
2
2
5 .
5 .
1
1
8 .
8 .
3
3
1
1
5 .
5 .
2
2
6 .
6 .
3
3
4
4
5 .
5 .
2
2
8 .
8 .
3
3
7
7
5 .
5 .
3
3
1 .
1 .
4
4
3
3
5 .
5 .
3
3
6 .
6 .
4
4
5
5
3
3
7 .
7 .
4
4
6
6
5 .
5 .
3
3
8 .
8 .
5
5
1
1
4
4
2 .
2 .
5
5
5
5
5 .
5 .
4
4
6 .
6 .
5
5
7
7
4
4
7 .
7 .
6
6
7
7
5 .
5 .
5
5
6 .
6 .
6
6
9
9
5
5
7 .
7 .
7
7
3
3
5 .
5 .
6
6
1 .
1 .
7
7
9
9
5 .
5 .
6
6
6 .
6 .
8
8
1
1
6
6
7 .
7 .
9
9
1
1
5 .
5 .
7
7
6 .
6 .
9
9
3
3
7
7
7 .
7 .
9
9
7
7
5 .
5 .
8
8
1 .
1 .
1
1
0
0
3
3
5 .
5 .
8
8
6 .
6 .
1
1
0
0
8
8
9
9
1
1
1
1
7
7
9
9
7 .
7 .
1
1
1
1
8
8
5 .
5 .
9
9
8 .
8 .
1
1
2
2
6
6
1
1
0
0
1
1
3
3
0
0
5 .
5 .
1
1
0
0
8 .
8 .
1
1
3
3
5
5
1
1
1
1
2 .
2 .
1
1
3
3
9
9
5 .
5 .
1
1
1
1
6 .
6 .
1
1
4
4
2
2
5 .
5 .
1
1
1
1
8 .
8 .
1
1
4
4
4
4
1
1
2
2
1
1
5
5
4
4
5 .
5 .
1
1
2
2
8 .
8 .
1
1
6
6
0
0
5 .
5 .
1
1
3
3
3 .
3 .
1
1
7
7
2
2
5 .
5 .
1
1
4
4
3 .
3 .
1
1
7
7
7
7
1
1
4
4
7 .
7 .
1
1
8
8
6
6
1
1
5
5
1
1
9
9
6
6
5 .
5 .
1
1
6
6
3 .
3 .
2
2
0
0
7
7
1
1
7
7
2 .
2 .
2
2
1
1
1
1
5 .
5 .
1
1
7
7
6 .
6 .
2
2
1
1
7
7
5 .
5 .
1
1
8
8
1 .
1 .
2
2
2
2
9
9
5 .
5 .
1
1
9
9
1 .
1 .
2
2
3
3
2
2
5 .
5 .
1
1
9
9
3 .
3 .
4 1/2 in.
2
2
4
4
1
1
5 .
5 .
2
2
0
0
1 .
1 .
2
2
4
4
6
6
2
2
0
0
2
2
5
5
2
2
2
2
1
1
Table 14: Vent Section Length
Note: Convert inches into metric equivalent
measurement, as follows:
Millimeters (mm) = Inches x 25.4
Centimeters (cm) = Inches x 2.54
Meters (m) = Inches x .0254
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
N
N
T
T
S
S
E
E
C
C
T
T
O I
O I
N
N
L
L
E
E
N
N
G
G
T
T
H
H
C
C
H
H
A
A
R
R
T
T
h t
h t
6
6
1
1
2
2
2
2
4
4
3
3
6
6
4
4
8
8
n
n
4
4
1 -
1 -
2 /
2 /
1
1
0
0
1 -
1 -
2 /
2 /
2
2
2
2
1 -
1 -
2 /
2 /
3
3
4
4
1 -
1 -
2 /
2 /
4
4
6
6
1 -
1 -
e
e
) s
) s
t n
t n
N
N
u
u
m
m
b
b
r e
r e
f o
f o
V
V
e
e
t n
t n
S
S
e
e
t c
t c
o i
o i
s n
s n
7
7
5
5
1
1
0
0
0
0
0
0
0
0
5
5
2
2
0
0
0
0
0
0
0
0
7
7
5
5
0
0
1
1
0
0
0
0
0
0
5
5
1
1
1
1
0
0
0
0
0
0
7
7
5
5
0
0
0
0
1
1
0
0
0
0
2
2
5
5
0
0
3
3
0
0
0
0
0
0
7
7
5
5
0
0
0
0
0
0
1
1
0
0
2
2
5
5
1
1
1
1
1
1
0
0
0
0
2
2
5
5
0
0
2
2
1
1
0
0
0
0
5
5
0
0
0
0
2
2
0
0
0
0
7
7
5
5
0
0
0
0
0
0
0
0
1
1
5
5
1
1
0
0
0
0
0
0
1
1
2
2
5
5
0
0
1
1
2
2
0
0
0
0
5
5
0
0
0
0
1
1
1
1
0
0
2
2
5
5
0
0
0
0
3
3
0
0
0
0
5
5
0
0
0
0
0
0
2
2
0
0
2
2
5
5
1
1
0
0
0
0
2
2
0
0
2
2
5
5
0
0
1
1
0
0
2
2
0
0
5
5
0
0
0
0
0
0
1
1
1
1
2
2
5
5
0
0
0
0
2
2
0
0
1
1
5
5
0
0
0
0
0
0
0
0
2
2
2
2
5
5
1
1
0
0
0
0
0
0
2
2
2
2
5
5
0
0
0
0
0
0
3
3
0
0
1
1
0
0
0
0
3
3
0
0
5
5
1
1
0
0
5
5
0
0
0
0
7
7
5
5
1
1
1
1
0
0
3
3
0
0
5 .
5 .
0
0
0
0
1
1
3
3
0
0
7
7
5
5
1
1
0
0
1
1
3
3
0
0
5
5
0
0
0
0
6
6
0
0
0
0
2
2
5
5
0
0
0
0
0
0
0
0
3
3
7
7
5
5
1
1
0
0
0
0
4
4
0
0
1
1
0
0
0
0
0
0
3
3
7
7
5
5
1
1
1
1
0
0
0
0
3
3
7
7
5
5
0
0
2
2
0
0
0
0
3
3
7
7
5
5
0
0
0
0
0
0
5
5
0
0
5
5
1
1
0
0
0
0
5
5
0
0
5 .
5 .
0
0
0
0
0
0
0
0
4
4
7
7
5
5
0
0
1
1
0
0
0
0
4
4
5
5
0
0
0
0
0
0
6
6
0
0
2
2
5
5
1
1
0
0
0
0
6
6
0
0
2
2
5
5
0
0
1
1
0
0
6
6
0
0
2
2
5
5
0
0
0
0
1
1
6
6
0
0
7
7
5
5
0
0
0
0
0
0
0
0
5
5
2
2
5
5
0
0
0
0
0
0
7
7
0
0
5 .
5 .
1
1
0
0
0
0
7
7
0
0
0
0
1
1
0
0
7
7
0
0
V
V
E
E
N
N
T
T
S
S
E
E
C
C
T
T
O I
O I
N
N
N
N
o
o
m
m
n i
n i
l a
l a
T
T
S
S
e
e
i t c
i t c
n o
n o
e L
e L
g n
g n
h t
h t
6
6
2 1
2 1
O O O O O
O O O O O
i (
i (
c n
c n
e h
e h
) s
) s
T T T T T
T T T T T
A A A A A
A A A A A
N
N
t e
t e
S
S
e
e
i t c
i t c
n o
n o
2 /
2 /
4
4
1 -
1 -
2 /
2 /
0 1
0 1
1 -
1 -
L L L L L
L L L L L
e L
e L
g n
g n
h t
h t
i (
i (
c n
c n
e h
e h
) s
) s
Q Q Q Q Q
Q Q Q Q Q
H
H
e
e
g i
g i
t h
t h
f o
f o
V
V
e
e
t n
t n
N
N
u
u
m
m
b
b
T T T T T
T T T T T
Y Y Y Y Y
Y Y Y Y Y
n i
n i
h c
h c
s e
s e
t f
t f
1
1
2
2
6 7
6 7
3 2
3 2
0
0
0
0
2
2
2
2
9 7
9 7
2
2
. 3
. 3
5 2
5 2
0
0
0
0
1
1
2
2
0 8
0 8
5 .
5 .
3 2
3 2
3 .
3 .
5 7
5 7
1
1
0
0
2
2
2
2
9 8
9 8
5 .
5 .
4 2
4 2
1 .
1 .
5 2
5 2
0
0
1
1
1
1
3
3
1 0
1 0
5 .
5 .
5 2
5 2
1 .
1 .
5 2
5 2
0
0
0
0
3
3
3
3
0 1
0 1
5 .
5 .
5 2
5 2
8 .
8 .
5 7
5 7
0
0
0
0
1
1
3
3
5 2
5 2
5 .
5 .
7 2
7 2
1 .
1 .
5 2
5 2
0
0
0
0
3
3
3
3
0 3
0 3
7 2
7 2
5 .
5 .
1
1
0
0
3
3
3
3
5 4
5 4
2
2
. 8
. 8
5 7
5 7
0
0
0
0
2
2
3
3
9 4
9 4
5 .
5 .
9 2
9 2
1 .
1 .
5 2
5 2
1
1
0
0
1
1
3
3
2 7
2 7
1 3
1 3
0
0
0
0
2
2
3
3
9 7
9 7
5 .
5 .
1 3
1 3
6 .
6 .
5 2
5 2
0
0
0
0
3
3
4
4
8 1
8 1
5 .
5 .
4 3
4 3
8 .
8 .
5 7
5 7
0
0
0
0
2
2
4
4
5 6
5 6
3
3
. 8
. 8
5 7
5 7
0
0
0
0
3
3
4
4
5 7
5 7
5 .
5 .
9 3
9 3
6 .
6 .
5 2
5 2
0
0
1
1
2
2
4
4
0 8
0 8
0 4
0 4
1
1
1
1
3
3
4
4
2 9
2 9
1 4
1 4
1
1
0
0
3
3
4
4
9 9
9 9
5 .
5 .
1 4
1 4
6 .
6 .
5 2
5 2
0
0
0
0
2
2
5
5
4 0
4 0
2 4
2 4
1
1
0
0
3
3
5
5
1 1
1 1
5 .
5 .
2 4
2 4
6 .
6 .
5 2
5 2
0
0
0
0
2
2
5
5
0 2
0 2
5 .
5 .
3 4
3 4
3 .
3 .
5 7
5 7
0
0
2
2
3
3
5
5
1 3
1 3
4
4
. 4
. 4
5 2
5 2
0
0
2
2
3
3
5
5
8 3
8 3
5 .
5 .
4 4
4 4
8 .
8 .
5 7
5 7
1
1
0
0
4
4
5
5
9 4
9 4
4
4
. 5
. 5
5 7
5 7
1
1
0
0
6
6
5
5
8 5
8 5
6 4
6 4
5 .
5 .
0
0
0
0
5
5
5
5
2 6
2 6
5 .
5 .
6 4
6 4
8 .
8 .
5 7
5 7
1
1
0
0
4
4
5
5
8 6
8 6
5 .
5 .
7 4
7 4
3 .
3 .
5 7
5 7
0
0
1
1
5
5
5
5
3 7
3 7
4
4
. 7
. 7
5 7
5 7
1
1
1
1
6
6
5
5
0 8
0 8
5 .
5 .
8 4
8 4
3 .
3 .
5 7
5 7
0
0
0
0
3
3
5
5
9 8
9 8
5 .
5 .
9 4
9 4
1 .
1 .
5 2
5 2
0
0
1
1
5
5
5
5
5 9
5 9
5 .
5 .
9 4
9 4
6 .
6 .
5 2
5 2
1
1
1
1
4
4
6
6
4 0
4 0
5 .
5 .
0 5
0 5
3 .
3 .
5 7
5 7
0
0
0
0
5
5
6
6
5 1
5 1
5
5
. 1
. 1
5 2
5 2
0
0
1
1
5
5
6
6
5 2
5 2
5 .
5 .
2 5
2 5
1 .
1 .
5 2
5 2
0
0
2
2
5
5
6
6
1 3
1 3
5 .
5 .
2 5
2 5
6 .
6 .
5 2
5 2
1
1
0
0
6
6
6
6
7 3
7 3
5 .
5 .
3 5
3 5
1 .
1 .
5 2
5 2
0
0
1
1
4
4
6
6
1 5
1 5
5
5
. 4
. 4
5 2
5 2
0
0
0
0
5
5
6
6
5 5
5 5
5 .
5 .
4 5
4 5
6 .
6 .
5 2
5 2
1
1
0
0
6
6
6
6
2 7
2 7
6 5
6 5
0
0
2
2
7
7
6
6
8 7
8 7
6 5
6 5
5 .
5 .
1
1
0
0
7
7
6
6
8 8
8 8
5 .
5 .
7 5
7 5
3 .
3 .
5 7
5 7
1
1
1
1
7
7
6
6
7 9
7 9
5 .
5 .
8 5
8 5
1 .
1 .
5 2
5 2
0
0
0
0
5
5
7
7
2 0
2 0
8 5
8 5
5 .
5 .
1
1
0
0
7
7
7
7
2 1
2 1
5 .
5 .
9 5
9 5
3 .
3 .
5 7
5 7
1
1
1
1
8
8
7
7
0 2
0 2
0 6
0 6
0
0
0
0
8
8
E L
E L
N
N
G
G
T
T
H
H
C
C
H
H
A
A
R
R
T
T
T
T
4 2
4 2
6 3
6 3
8 4
8 4
O
O
T
T
A
A
2 /
2 /
2 2
2 2
1 -
1 -
2 /
2 /
4 3
4 3
1 -
1 -
2 /
2 /
6 4
6 4
1 -
1 -
2 /
2 /
L
L
r e
r e
f o
f o
V
V
e
e
t n
t n
S
S
e
e
t c
t c
o i
o i
s n
s n
Q
Q
T
T
Y
Y
0
0
8
8
0
0
8
8
0
0
0
0
6
6
6
6
0
0
8
8
0
0
9
9
0
0
0
0
6
6
7
7
1
1
0
0
6
6
7
7
0
0
9
9
0
0
9
9
0
0
0
0
7
7
7
7
0
0
0
0
7
7
8
8
0
0
0 1
0 1
0
0
0 1
0 1
0
0
0 1
0 1
0
0
1 1
1 1
0
0
0
0
8
8
8
8
0
0
1 1
1 1
0
0
1 1
1 1
0
0
0
0
9
9
9
9
0
0
0
0
0 1
0 1
0 1
0 1
0
0
0
0
0 1
0 1
1 1
1 1
0
0
0
0
0 1
0 1
1 1
1 1
1
1
0
0
0 1
0 1
2 1
2 1
0
0
1
1
0 1
0 1
1 1
1 1
0
0
1
1
0 1
0 1
2 1
2 1
0
0
0
0
1 1
1 1
1 1
1 1
0
0
1
1
1 1
1 1
4 1
4 1
2
2
0
0
1 1
1 1
5 1
5 1
0
0
2
2
1 1
1 1
4 1
4 1
2
2
1
1
1 1
1 1
5 1
5 1
0
0
0
0
2 1
2 1
2 1
2 1
0
0
0
0
2 1
2 1
3 1
3 1
0
0
0
0
2 1
2 1
3 1
3 1
0
0
0
0
2 1
2 1
4 1
4 1
1
1
0
0
2 1
2 1
3 1
3 1
2
2
2
2
0 1
0 1
5 1
5 1
1
1
0
0
2 1
2 1
5 1
5 1
0
0
0
0
3 1
3 1
3 1
3 1
0
0
0
0
3 1
3 1
4 1
4 1
0
0
0
0
3 1
3 1
5 1
5 1
1
1
0
0
3 1
3 1
5 1
5 1
1
1
0
0
3 1
3 1
5 1
5 1
0
0
0
0
4 1
4 1
4 1
4 1
0
0
0
0
4 1
4 1
5 1
5 1
0
0
0
0
4 1
4 1
6 1
6 1
1
1
0
0
4 1
4 1
6 1
6 1
1
1
0
0
4 1
4 1
7 1
7 1
0
0
0
0
5 1
5 1
5 1
5 1
0
0
0
0
5 1
5 1
6 1
6 1
0
0
0
0
5 1
5 1
7 1
7 1
1
1
0
0
5 1
5 1
6 1
6 1
13
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