Enviro ENVIRO - Manual (Page 18)

Initial Installation
QUALIFIED INSTALLERS ONLY
V
ENT
C
ONFIGURATIONS AND
R
ESTRICTOR
S
ETTINGS
:
Figure 24 and 25 shows the range of possible vent configurations if the unit is top vented, for vertical
and horizontal terminations, any layout that remains within the grid areas is acceptable. They also show
the vent restrictor required, relative to the length of vent pipe. Longer vertical vent lengths necessitate
greater restriction.
Having the fewest number of elbows is ideal, as they tend to disrupt air movement. Using 45˚ elbows is
preferable to using 90˚ elbows. Also, a shorter vent system will perform better than a longer one.
If the unit is rear vented it may have a maximum horizontal run of 36” (91.4 cm) and must be used with
a 36” (91.4 cm) snorkel termination.
Figure 24: Possible Vent Configurations for Top Vented;
Vertical and Horizontal Terminations with Elbows.
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
F
ee
t
o
f
V
en
t
F
ro
m
T
o
p
o
f
U
n
it
75% RESTRICTOR
70% RESTRICTOR
50% RESTRICTOR
NO RESTRICTOR
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
2 4 6 8 10 12 14 16 18 20
Horizontal Feet of Vent
Ve
rt
ic
al
Fe
et
of
Ve
nt
(F
ro
m
To
p
of
U
ni
t)
UP TO 2 ELBOWS
NO RESTRICTOR
50% RESTRICTOR
UP TO 4 ELBOWS
60% RESTRICTOR
UP TO 4 ELBOWS
1 ELBOW
NO RESTRICTOR
0
NOTE: For best results, 3' (76.2cm) or more of
vertical rise is recommended.
Figure 25: Possible Vent Configurations for Top
Vented; Straight Vertical Vent & Terminations.
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