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Heatilator • Caliber Mesh CD Series-SIT Valve • 4040-849 Rev J • 06/08 23
H
1
V
1
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 CD series appliances can adapt to SLP series
vent pipe when venting off the top of the appliance.
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
0 0.00 - - 1.5 0.46
0.5 0.15 - - 6 1.83
1 0.30 - - 11 3.35
1.5 0.46 - - 18 5.49
2 0.61 - - 25 7.62
DVP 25 7.62 25 7.62
SLP 23 7.01 23 7.01
You may install a DVP elbow directly on top of the
CD4236M. The CD4842M requires the DVP6 vent
section prior to the elbow.