Lennox EDV40RNM Installation Instructions Manual page 21

HORIZONTAL VENT FIGURES/TABLES (continued)
H 1
Wall Firestop/
Spacer
SV4.5HF**
V
Square termination (SV4.5HT-2) shown.
Figure 40 - Rear Vent - TWO 90 DEGREE ELBOWS
Wall Firestop/Spacer
H 1
*When using Secure Flex, use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
Square termination (SV4.5HT-2) shown.
See Table 8 on Page 20 as an aid in venting component
selection for a particular range of exterior wall thicknesses.
Figure 41 - Top Vent - TWO 90 DEGREE ELBOWS
H
Ceiling
Firestop/Spacer
SV4.5VF*
*When using Secure Flex , use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
SV4.5HF**
H
Wall Firestop/Spacer
SV4.5HF**
Ceiling Firestop/Spacer
SV4.5VF*
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
H Maximum
+H
1
feet (meters)
(1.524)
5
(3.048)
10
(4.572)
15
(6.096)
20
H + H 1 = 20 feet (6.096 meters) Max.
Example: If 20 feet of (H) 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) horizontal run,
up to a maximum horizontal run of 20 feet.
®
See Table 8 on page 20 as an aid in venting component se-
lection for a particular range of exterior wall thicknesses.
V
TABLE H
H Maximum V Minimum
(meters)
feet feet
2 (0.610) 1
4 (1.219) 2
6 (1.829) 3
8 (2.438) 4
V + H + H 1 = 40 feet (12.2 m) Max.
H = 8 feet (2.438 meters) Max.
TABLE J
H Maximum V Minimum
+ H
1
feet (meters)
feet
(0.914) Elbow Only
3
(1.524)
5 1
(3.048)
10 2
(4.572)
15 3
20 (6.096) 4
H
V + + H = 40 feet (12.2 m) Max.
1
H
+ H = 20 ft. (6.096 m) Max.
1
Example: If 20 feet of (H) 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) 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
component in the system. See Figure 38.
(meters)
(0.305)
(0.610)
(0.914)
(1.219)
(meters)
(0.305)
(0.610)
(0.914)
(1.219)
21