14
Heatilator • GB4336/GB4992 • 4003-085 Rev H • 04/06
45°
Elbow
90°
Elbow
Offsets exceeding
45° adapt horizontal
limitations
Maximum
horizontal
20 ft (6.1 m)
Note: Maximum horizontal
distance is 50% of vertical
vent height.
Maximum horizontal run is 50% of
vertical. Horizontal run cannot be
more than 20 ft. (6.1 m).
Vent supports
are per vent
manufacturer
’
s
specifications.
Metal
Plumbers'
Strap
Figure 5.2
Maximum Horizontal Run
Fire Risk
Explosion Risk
Insulation and other combustibles must not
infringe on clearances.
• ALWAYS maintain specifi ed clearances
around venting and fi restop systems.
• Install fi restops as specifi ed.
Failure to keep insulation or other material
away from vent pipe may cause fi re.
WARNING
Figure 5.3
Maximum Horizontal Run
Note:
90-degree elbows are not allowed without a
fi xed glass door. Only 45-degree elbows or less are
allowed. A straight section is not reuqired before the
fi rst elbow.
