Heatilator • GDST5244I • 4045-127 • Rev Z • 08/09
2
H
1
V
1
To replace the first starter elbow with two 45° elbows,
refer to Figure 7.4. All other 90° elbows can be replaced
with two 45° elbows.
General Rules:
• SUBTRACT ft. from the total H measurement for each
90° elbow installed horizontally.
• SUBTRACT 1-1/2 ft. from the total H measurement for
each 45° elbow installed horizontally.
• A maximum of three 90° elbows (or six 45° elbows)
may be used in any vent configuration. Some elbows
may be installed horizontally. See Figure 7.9.
• Elbows may be placed back to back anywhere in the
system as long as the first 90° elbow is a starter elbow
except as shown in Figure 7.4.
• When penetrating a combustible wall, a wall shield
firestop must be installed.
• When penetrating a combustible ceiling, a ceiling
firestop must be installed.
• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.
E. Vent Diagrams
Figure 7.3
One Elbow
1. Top Vent - Horizontal Termination
Note: The GDST5244 series appliances can adapt
to SLP series vent pipe.
You must use a DVP-SLP24
adapter which can only be attached to the appliance
starting collar.
When looking at horizontal termination
diagrams, the
adapter is not counted as part of the minimum vertical
(V
1
min.) requirements.
Whether horizontal or vertical termination, the adapter is
counted as part of the maximum vertical limitations.
All venting rules for the vent run must still be followed.
H
1
= 11 ft.
max.
V
1
= 1 ft.
DVP-SLP24
H
1
= 11 ft.
max
V
1
= 1 ft.
DVP
HORIZONTAL EXAMPLE
SLP
12 ft (3.66 m) min.
60 ft (18.29 m) max.
12 ft (3.66 m) min.
60 ft (18.29 m) max.
DVP
VERTICAL EXAMPLE
SLP
DVP-SLP24
Adapter
V
1
min.
V
1
max.
H
1
max.
ft
m
ft
m
ft
m
1
0.0
-
-
2 in. 81 mm
1.5
0.46
-
-
18
5.49
2
0.61
-
-
25
7.62
-
-
25
7.62
25
7.62
