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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 30 - Top Vent - THREE 90 DEGREE ELBOWS
See Table 6 on Page 17 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 29 - Top Vent - TWO 90 DEGREE ELBOWS
See Table 6 on Page 17 as an aid in venting component selection for a particular range of
exterior wall thicknesses.