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5 5
Vent Information and Diagrams
A. Vent Guidelines
WARNING! Fire Risk/Asphyxiation! This appliance re-
quires the specifi ed pipe for operation. Incorrect pipe may
cause spillage, condensation and overheating.
These models require the following size B-vent double
wall vent pipe.
Model
NBV3630I-B/NBV3933I-B
NBV4236I-B/NBV4842I-B
•
Follow pipe manufacturer's installation guidelines when
installing the appliance.
WARNING!
Fire Risk/Explosion/Asphyxiation!
connect this gas appliance to a chimney fl ue serving a
separate solid-fuel or gas burning appliance.
• Vent this appliance directly outside.
• Use separate vent system for this appliance.
May impair safe operation of this appliance or other
appliances connected to the fl ue.
B. Vent System Confi guration
CAUTION! Risk of Fire! ALL vent confi guration specifi -
cations MUST be followed.
to these specifi cations. Appliance performance will suffer if
specifi cations are not followed.
Rise to Run Ratio = 2:1
Maximum Total Horizontal Run = 30 Feet
Minimum Total Vertical Rise =12 Feet
Maximum Total Vertical Rise = 60 Feet
Maximum Number of Elbows: Four 90º or Eight 45º
WARNING! Risk of Fire or Explosion! 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.
Heatilator • NBV3630I-B, NBV3933I-B, NBV4236I-B, NBV4842I-B Installation Manual • 2376-980 Rev. F • 7/16
Pipe Size
5 in. (127 mm)
5 in. (127 mm)
DO NOT
This product is tested and listed
Maximum
horizontal
30 ft (9.14 m)
45°
Elbow
90°
Elbow
Figure 5.1
Maximum Horizontal Run Using 45° Elbows
C. Vent Diagrams
To replace the fi rst 90º starter elbow with two 45º elbows,
refer to Figure 5.1. All other 90º elbows can be replaced
with two 45º elbows.
General Rules:
• The vent system must terminate vertically.
• Vent this appliance directly outside.
• Use a separate vent system for this appliance.
• Rise to run ratio not to exceed 2:1.
• Maximum total horizontal run is 30 feet (9.1 m).
• Maximum total vertical rise is 60 feet (18.3 m).
Offsets exceeding
45° adapt horizontal
limitations
Note: Maximum horizontal
distance is 50% of vertical
vent height.
17
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