Horizontal Vent Tables And Figures - Lennox Hearth Products Electronic LMDV-3530-CNM Installation Instructions Manual

HORIZONTAL VENT FIGURES/TABLES
Notes:
• Secure Vent components (rigid vent pipe and terminal) are shown in
the Figures; Secure Flex components (flexible vent pipe and terminal)
may also be used.
• 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.
• SV4.5VF (Secure Vent), SF4.5VF (Secure Flex) firestop/spacer must
be used anytime vent pipe passes through a combustible floor or ceil-
ing. SV4.5HF (Secure Vent), SF4.5HF (Secure Flex) firestop/spacer
must be used anytime vent pipe passes through a combustible wall.
• It is very important that the horizontal/inclined 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.
• The tables show a 1(V) to 5(H) ratio up to a maximum horizontal run
of 20 feet except for installations where an elbow is the only vertical
vent section in the system (see Figure 37).
• AN ELBOW IS ACCEPTABLE AS 1 FOOT OF VERTICAL RISE EXCEPT
WHERE AN ELBOW IS THE ONLY VERTICAL COMPONENT IN THE
SYSTEM. See Figure 37.
Venting Components Required for Various Exterior Wall Thick-
nesses, when using Square Termination Kit (SV4.5HT-2)
Vent Components Required
Termination Kit Only
Termination Kit and 6 In. Vent
Section (SV4.5L6)
Termination Kit and 12 in.
Vent Section (SV4.5L12)
Termination Kit and Tele-
scopic Section (SV4.5L12)
Table 12
See Table 12 as an aid in venting component selection for a particular
range of exterior wall thicknesses.
H = 28 in. (711 mm) Maximum.
� Wall Firestop/Spacer
7 in. (178 mm)
Figure 36
- Rear Vent - NO ELBOWS - Square Horizontal
Termination (SV4.5HT-2)
Exterior Wall Thickness - inches (mm)
6 to 9-1/4 (152 to 235)
10-3/4 to 14 (273 to 356)
16-3/4 to 20 (426 to 508)
11-3/4 to 20 (299 to 508)
Note: See Figure 35 showing wall thickness range
when using SV4.5HT-2 termination kit only.
H
(SV4.5HF)
Square termination
(SV4.5HT-2) shown.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
WARNING
Under no circumstances, may separate sections of
concentric flexible vent pipe be joined together.
Table F
H Maximum V Minimum
feet (meter) feet (meter)
3 (0.914) Elbow Only
Square termination
(SV4.5HT-2) shown.
See Table 12 as an aid in venting component selection for a particular
range of exterior wall thicknesses.
Figure 37
- Top Vent -
ONE 90 DEGREE ELBOW - ELBOW CONNECTION AT APPLIANCE
Table G
V Minimum
H Maximum
feet (meter) feet (meter)
5 (1.524) 1 (0.305)
10 (3.048) 2 (0.610)
15 (4.572) 3 (0.914)
20 (6.096) 4 (1.219)
V + H = 40 feet (12.2 m) Max.
H = 20 ft. (6.096 m) Max.
�
Wall Firestop/Spacer
Square termination
(SV4.5HT-2) shown.
See Table 12 as an aid in venting component selection for
a particular range of exterior wall thicknesses.
Figure 38
- Top Vent - ONE 90 DEGREE ELBOW -
ELBOW CONNECTION NOT DIRECTLY AT APPLIANCE
H
V
�
Wall
Firestop/Spacer
(SV4.5HF)
Example: If 20 feet of (H) hori-
zontal 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
vertical, you are allowed 5 feet
of (H) horizontal run up to a
maximum (H) horizontal run
of 20 feet.
H
(SV4.5HF)
V
19