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Heatilator • ICON DV-IDV Series • 4042-575 • Rev. S • 5/11 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.
E. Vent Diagrams
Figure 7.3
One Elbow
1. Top Vent - Horizontal Termination
V
1
min. V
1
max. H
1
max.
ft m ft m ft m
1 0.30 - - 25 in. 635 mm
1.5 0.46 - - 18 5.49
2 0.61 - - 25 7.62
- - 25 7.62 25 7.62
• 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.
NOTICE: ICON direct vent appliances require the use
of a vinyl soffi t shield (TRAP-VSS) whenever the unit is
terminated horizontally in a home with vinyl siding.