NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 23
VH2H1H
Wall Firestop/Spacer(SV4.5HF)
CeilingFirestop/Spacer(SV4.5VF)When using Secure Flex,
use Firestop/SpacerSF4.5VF.When using Secure
Flex, use Firestop/SpacerSF4.5HF.VHH1V1
Wall Firestop/Spacer(SV4.5HF)CeilingFirestop/Spacer(SV4.5VF)When using Secure Flex,use Firestop/SpacerSF4.5VF.
When using SecureFlex, use Firestop/SpacerSF4.5HF.
Wall Firestop/Spacer(SV4.5HF)Table K
H + H1 + H2 Maximum H Maximum V Minimum
feet (meter) feet (meter) feet (meter)
5 (1.524) 2 (0.610) 1 (0.305)
10 (3.048) 4 (1.219) 2 (0.610)
15 (4.572) 6 (1.829) 3 (0.914)
20 (6.096) 8 (2.438) 4 (1.219)
V + H + H1 + H2 = 40 feet (12.2 m) Max
H = 8 feet (2.438 meters) Max.
H + H1+ H2 = 20 feet (6.096 meters) Max.
Example: If 20 feet total (H+H1+H2) horizontal vent
run is needed, then 4 feet minimum of (V) vertical
vent will be required.
This table shows a 1(V) to 5(H) ratio. For every
1 foot of (V) vertical, you are allowed 5 feet of
horizontal run up to a maximum total (H+H1+H2)
horizontal run of 20 feet.
Figure 40 - Top Vent - THREE 90 DEGREE ELBOWS
Figure 39 - Rear Vent - THREE 90 DEGREE ELBOWS
See Table 12 on Page
21 as an aid in venting
component selection for
a particular range of exte-
rior wall thicknesses.
See Table 12 on Page 21 as an aid in venting
component selection for a particular range of
exterior wall thicknesses.
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Square termination
(SV4.5HT-2) shown.
Square termination (SV4.5HT-2) shown.
Table L
H + H1 Maximum V Minimum
feet (meter) feet (meter)
5 (1.524)
Elbow Only
5 (1.524) 1 (0.305)
10 (3.048) 2 (0.610)
15 (4.572) 3 (0.914)
20 (6.096) 4 (1.219)
H + H1 = 20 feet (6.096 m) Max.
V + V1+ H + H1 = 40 ft. (12.192 m) Max.
Example: If 20 feet total (H+H1) horizontal vent
run is needed, then 4 feet minimum of (V) vertical
vent will be required.
This table shows a 1(V) to 5(H) ratio. For every 1
foot of (V) vertical, you are allowed 5 feet of (H+
H1) horizontal run, up to a maximum horizontal
run of 20 feet.
An elbow is acceptable as 1 foot of vertical rise
except where an elbow is the only vertical com-
ponent in the system. See Figure 35.