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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
DV GAS FIREPLACES (LSM40/45MN-2, LSM40/45MP-2, LSM40/45EN-2) • INSTALLATION INSTRUCTIONS
Figure 33 - Top Vent - THREE 90 DEGREE ELBOWS
See Table 8 on Page 19 as an aid in venting component selection for a particular range of exterior wall thicknesses.
V
H
H
1
Wall Firestop/Spacer
(SV8HF)
Wall Firestop/Spacer
(SV8HF)
Ceiling
Firestop/Spacer
(SV8BF)
V
H
H
1
V
1
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 LSM40-2
V + V
1
= 10.5 feet (3.2 m) Min. for LSM45-2
HORIZONTAL VENT FIGURES/TABLES
(continued)
Figure 32 - Top Vent - TWO 90 DEGREE ELBOWS
See Table 8 on Page 19 as an aid in venting component selection for a particular range of
exterior wall thicknesses.