Heatilator • Novus B-Vent Series • 4055-188 • Rev. S • 3/13
20
Minimum
clearances are
per vent
manufacturer's
specifications
Metal
plumber's strap
secured to
framing
Vent supports are per
vent manufacturer's
specifications
12 ft (3.66 m) min.
60 ft (18.29 m) max.
45°
Elbow
90°
Elbow
Offsets exceeding
45° adapt horizontal
limitations
Maximum
horizontal
30 ft (9.14 m)
Note: Maximum horizontal
distance is 50% of vertical
vent height.
Maximum horizontal run is 50% of
vertical. Horizontal run cannot be
more than 30 ft. (9.14 m).
Vent supports
are per vent
manufacturer’s
specifications.
Metal
Plumbers'
Strap
7
7
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.
B. Vent System Confi guration
CAUTION! Risk of Fire! ALL vent confi guration specifi -
cations MUST be followed.
This product is tested and listed
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!
Fire Risk/Explosion/Asphyxiation!
DO NOT
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.
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.
Figure 7.1
Vertical Termination Clearances
Figure 7.2
Maximum Horizontal Run
Figure 7.3
Maximum Horizontal Run Using 45° Elbows
•
Follow pipe manufacturer’s installation guidelines when
installing the appliance.
Model
Pipe Size
NBV3630I/NBV3933I
5 in. (127 mm)
NBV4236I/NBV4842I
5 in. (127 mm)
