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19
Initial Installation
QUALIFIED INSTALLERS ONLY
VENT CONFIGURATIONS AND RESTRICTOR SETTINGS:
Figure 28 and 29 shows the range of possible vent congurations 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 28: Possible Vent Congurations 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
Feet of Vent From Top of Unit
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
Vertical Feet of Vent (From Top of Unit)
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 29: Possible Vent Congurations for Top
Vented; Straight Vertical Vent & Terminations.