Horizontal Terminations; Vertical Terminations - Lennox Hearth Products VISION Elite SDVSS-25 Installation And Operation Manual

Horizontal Terminations

The shaded areas in the diagram below show all allowable combinations
of vent configurations with horizontal terminations. Horizontal sections
of pipe require 1/4" of rise for every 12" of run. A second 90 degree or
45 degree elbow (in addition to the first 90 degree elbow at the top of
the vertical length of pipe) is allowed as long as the overall length of
the horizontal run of pipe does not exceed those shown below. Use the
restrictor positions indicated. Note that if the termination cap falls in the
unshaded area below then no restrictor is installed in the stove.
u
One 45° elbow is allowed when venting horizontal, straight off
the back of the unit. See Figure 19.
25'
24'
23'
22' #3
21'
20'
19'
18'
#2
17'
16'
15'
14'
13'
#2
12'
11'
10'
9'
8'
#1
7'
6'
5'
Vision 35 requires
4'
14" snorkel
3'
2'
1'
0'
u
See note
above
Figure 19
COMBINATION OF VERTICAL AND HORIZONTAL LENGTHS CANNOT EXCEED 25'.
Straight Horizontal With No Vertical
VISN­25 / SDVSS­25 ­ LP 0­3' horizontal ................... Standard Horizontal Cap..................... Use Light Obstructor
VISN­25 / SDVSS­25 ­ NG 0­3' horizontal................... Standard Horizontal Cap..................... Use Light Obstructor
VISN­35 / SDVSS­35 ­ LP 0­3' horizontal.................... 14" Snorkel Required......................... No Light Obstructor
VISN­35 / SDVSS­35 ­ NG 0­3' horizontal................... 14" Snorkel Required......................... No Light Obstructor*
Offsets must remain within maximum and minimum lines.
16
Horizontal Terminations
Venting configurations
may not terminate
outside this parameter.
#1
#1
Vision 25 standard cap
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
To install the stove with pipe directly out the back, a snorkel is not
required for VISN­25 / SDVSS­25 gas stoves. A snorkel is required for
the VISN­35 / SDVSS­35 gas stoves. See Pages 14 and 15 for snorkel
installation instructions.

Vertical Terminations

The diagram below shows all allowable combinations of straight verti­
cal and offset to vertical vent configurations with vertical terminations.
The termination must fall within the shaded areas on the diagram. Use
the indicated restrictor positions. Offsets may consist of two 90 degree
elbows OR four 45 degree elbows.
Vertical Terminations
25'
24'
23'
22'
#3
21'
20'
19'
#2
18'
#2
17'
16'
15'
#2
14'
13'
12'
11'
#1
10'
9'
8'
7'
6'
5'
4'
3'
2'
1'
0'
Figure 20
#1
#1