Heatilator • Novus NBV • 4055-188 Rev C • 04/08 13
Fire Risk
Explosion Risk
Asphyxiation Risk
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
ALL vent configuration specifications MUST be
followed.
• This product is tested and listed to appliance and
vent manufacturer’s specifi cations.
• Appliance performance will suffer if specifi cations
are not followed.
CAUTION
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.
Figure 5.1 Vertical Termination Clearances
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
Figure 5.2 Maximum Horizontal Run
5
5 Vent Information and Diagrams
A. Vent Guidelines
Fire Risk
Asphyxiation Risk
This appliance requires the specifi ed pipe
for operation.
• Incorrect pipe may cause spillage,
condensation and overheating.
WARNING
These models require the following size B-Vent double wall
vent pipe.
Model Pipe Size
NBV3630/NBV3630I/NBV3933/NBV3933I 5 in. (127 mm)
NBV4236/NBV4236I/NBV4842/NBV4842I 5 in. (127 mm)
• Follow pipe manufacturer’s installation guidelines when
installing the appliance.
B. Vent System Confi guration
• Rise to Run Ratio: 2:1
• Maximum Total Horizontal Run: 30 ft (9.14 m)
• Minimum Total Vertical Rise: 12 ft (3.66 m)
• Maximum Total Vertical Rise: 60 ft (18.29 m)
• Maximum Number of Elbows: Four 90° or Eight 45°