20
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
Figure 31 - Top Vent - Three 90 Degree Elbows
See
Table 9 on Page 19
as an aid in venting component selection for a particular range of exterior wall thicknesses.
V
H
H1
Wall Firestop/Spacer
(SV8HF)
Wall Firestop/Spacer
(SV8HF)
Ceiling
Firestop/Spacer
(SV8BF)
V
H
H1
V1
Wall Firestop/Spacer
(SV8HF)
Ceiling
Firestop/Spacer
(SV8BF)
Wall
Firestop/Spacer
(SV8HF)
Ceiling
Firestop/Spacer
(SV8BF)
Table D
H
+ H
1
Maximum
V Minimum
feet
(meter)
feet
(meter)
3.5
(1.07)
2.5
(0.762)
6.5
(1.98)
3.5
(1.07)
8.5
(2.6)
4.5
(1.37)
10.5
(3.2)
5.5
(1.68)
12.5
(3.8)
6.5
(1.98)
14.5
(4.4)
7.5
(2.3)
16.5
(5.0)
8.5
(2.6)
18.5
(5.6)
9.5
(2.9)
20
(6.0)
10
(3.0)
V +
H
+ H
1
= 40 feet (12.4 m) Max.
H
+ H
1
= 20 ft. (6.2 m) Max.
Table E
H
+ H
1
= 20 feet (6.2 m) Max.
V
+ V
1
+
H
+ H
1
= 40 ft. (12.4 m) Max.
V = 2.5 feet Min. (0.762 m)
V
+ V
1
= 11 feet (3.35 m) Min. for MDLX40
V
+ V
1
= 10.5 feet (3.2 m) Min. for MDLX45
HORIZONTAL VENT FIGURES/TABLES
(continued)
Figure 30 - Top Vent - Two 90 Degree Elbows
See
Table 9 on Page 19
as an aid in venting component selection for a particular range of
exterior wall thicknesses.
