Lennox Hearth Products MLDVTCD-35NE Installation Instructions Manual page 22

LENNOX HEARTH PRODUCTS • MERIT
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Typical termination shown.
H 1
Wall Firestop/Spacer
(SV4.5HF)
See Table 8 on Page 20 as
an aid in venting component
selection for a particular
range of exterior wall thick-
nesses.
Figure 32
- Top Vent - THREE 90 DEGREE ELBOWS
22
SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
When using Secure Flex,
use Firestop/Spacer
SF4.5VF.
When using Secure
Flex, use Firestop/Spacer
SF4.5HF.
Firestop/Spacer
V 1
Wall Firestop/Spacer
(SV4.5HF)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Ceiling
(SV4.5VF)
H
V
Table F
V Minimum
H Maximum
+ H
1
feet (meter) feet
5 (1.524) Elbow Only
5 (1.524) 1
10 (3.048) 2
15 (4.572) 3
20 (6.096) 4
H + H = 20 feet (6.096 m) Max.
1
V H
+ V + + H = 40 ft. (12.2 m) Max.
1 1
Example: If 20 feet total (H+H ) horizontal vent
1
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+
H ) horizontal run, up to a maximum horizontal
1
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 29.
(meter)
(0.305)
(0.610)
(0.914)
(1.219)