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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 27 - Top Vent - THREE ELBOWS
V
H
1
H
V
1
Ceiling
Firestop/Spacer
(SV8BF)
Wall
Firestop/Spacer
(SV8HF)
Table B
H + H
1
Maximum
V Minimum
feet (meter) feet (meter)
10 (3.1) 2.5 (0.762)
15 (4.65) 3.5 (1.06)
20 (6.2) 4.5 (1.37)
H + H
1
= 20 feet (6.2 m) Max.
V + V
1
+ H + H
1
= 40 ft. (12.4 m) Max.
V + V
1
= 11 feet (3.3 meters) Min. for LSM40-2
V + V
1
= 10.5 feet (3.2 meters) Min. for LSM45-2
H
V
V1
Ceiling
Firestop/Spacer
(SV8BF)
Table A
H Maximum
V Minimum
feet (meter) feet (meter)
10 (3.1) 2.5 (0.762)
15 (4.65) 3.5 (1.07)
20 (6.2) 4.5 (1.37)
V + V
1
+ H = 40 feet (12.4 meters) Max.
V + V
1
= 11 feet (3.3 meters) Minimum for LSM40-2
V + V
1
= 10.5 feet (3.2 meters) Minimum for LSM45-2
Figure 26 - Top Vent - Corner Framing with Square Termination (SV8HTS)
TWO 90 DEGREE ELBOWS
40 feet (12.2 meters)
Maximum
6 feet (1.8 meters)
Minimum
Ceiling
Firestop/Spacer
(SV8BF)
Figure 25 - Top Vent - STRAIGHT
VERTICAL VENT FIGURES/TABLES
Notes:
• Secure Vent™ (rigid vent pipe) is shown
in the Figures.
• It is very important that the horizontal/in
-
clined run be maintained in a straight (no
dips) and recommended to be in a slightly
elevated plane, in a direction away from the
fireplace of 1/4" rise per foot (20 mm per
meter) which is ideal, though rise per foot
run ratios that are smaller are acceptable all
the way down to at or near level.
• SV8BF (Secure Vent) firestop/spacer must
be used anytime vent pipe passes through a
combustible floor or ceiling. SV8HF (Secure
Vent) firestop/spacer must be used anytime
vent pipe passes through a combustible
wall.
• Two 45 degree elbows may be used in place
of one 90 degree elbow. The same rise to
run ratios, as shown in the venting figures
for 90 elbows, must be followed if 45 degree
elbows are used.
A Vent Restrictor, as shown in Figure 15 on Page
12, may need to be used in this application
Example: If 20 feet of (H)
horizontal vent run is needed,
then 4-1/2 feet minimum of (V)
vertical vent will be required.
Example: If 20 feet of (H+ H
1
) horizon-
tal vent run is needed, then 4-1/2 feet
minimum of (V) vertical vent will be
required.