Lennox EDV40RNM Installation Instructions Manual page 17

VERTICAL VENT FIGURES/TABLES
(continued)
TABLE C
H +H Maximum H Maximum
1
(meters)
feet feet
(1.524)
5 2
(3.048)
10 4
(4.572)
15 6
(6.096)
20 8
V + V 1 + H + H 1 = 40 feet (12.2 m) Max
H = 8 feet (2.438 meters) Max.
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.
NOTE: Install the U-shaped vent restrictor in any vent run with
more than 8 ft. of vertical rise. See Page 12.
Figure 32 - Rear Vent - THREE ELBOWS
TABLE D
H + Maximum
H
1
feet (meters) feet
(1.524)
5
(1.524)
5
(3.048)
10
(4.572)
15
(6.096)
20
H + H = 20 feet (6.096 m) Max.
1
V + V + H + H = 40 ft. (12.192 m) Max.
1 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) verti-
cal, 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.
NOTE: Install the U-shaped vent restrictor in any vent run with more than
8 ft. of vertical rise. See Page 12.
Figure 33 - Top Vent - THREE ELBOWS
V Minimum
(meters) (meters)
feet
(0.610) (0.305)
1
(1.219) (0.610)
2
(1.829) (0.914)
3
(2.438) (1.219)
4
V Minimum
(meters)
Elbow Only
(0.305)
1
(0.610)
2
(0.914)
3
(1.219)
4
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
H1
Ceiling
Firestop/Spacer
SV4.5VF*
Wall
Firestop/Spacer
SV4.5HF**
V1
V
Ceiling
Firestop/Spacer
V 1
SV4.5VF*
H 1
*When using Secure Flex, use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
*When using Secure Flex, use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
Ceiling
Firestop/Spacer
SV4.5VF*
H
Wall
Firestop/Spacer
SV4.5HF**
H
V
17