Heatilator • GDST5244I • 4045-127 • Rev W • 11/08 23
H1
V1
To replace the fi rst 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 3 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 confi guration. 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 fi rst 90° elbow is a starter elbow
except as shown in Figure 7.4.
• When penetrating a combustible wall, a wall shield
fi restop must be installed.
• When penetrating a combustible ceiling, a ceiling
fi restop 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 t he appliance
starting collar.
When looking at horizontal termination diagrams, the
adapter is not counted as part of the minimum vertical
(V1 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.
H1 = 11 ft.
max.
V1 = 1 ft.
DVP-SLP24
H1 = 11 ft.
max
V1 = 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
V1 min. V1 max. H1 max.
ft m ft m ft m
1 0.30 - - 32 in. 813 mm
1.5 0.46 - - 18 5.49
2 0.61 - - 25 7.62
- - 25 7.62 25 7.62