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3
General venting
Sizing
The Noble Fire Tube uses model specific combustion air
intake and vent piping sizes as detailed in Table 3A below.
Table 3A Air Intake/Vent Piping Sizes
Model
2" Max Vent/Air 3" Max Vent/Air
80 - 110
100 feet
150
60 feet
199
N/A
Increasing or decreasing combustion air
NOTICE
or vent piping sizes is not authorized
unless otherwise specified in this manual.
Minimum / Maximum allowable combustion
air and vent piping lengths are as follows:
Combustion Air = 7 equivalent feet minimum / 100 equivalent
feet maximum
Vent = 7 equivalent feet minimum / 100 equivalent feet
maximum
When determining equivalent combustion air and vent length,
add 5 feet for each 90° elbow and 3 feet for each 45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit (100140480) = 49 equivalent
feet of piping.
The appliance output rating will reduce by
NOTICE
up to 1.5% for each 25 feet of vent length.
Table 3B Concentric Vent Kit Equivalent Vent Lengths
Kit
Model
Number
80 - 150
100140485
80 - 199
100140480
Materials
Air inlet pipe materials:
The air inlet pipe(s) must be sealed. Choose acceptable
combustion air inlet pipe materials from the following list:
PVC, CPVC, Polypropylene or ABS
Galvanized steel vent pipe with joints and seams sealed as
specified in this section.
Type "B" double-wall vent with joints and seams sealed as
specified in this section.
AL29-4C, stainless steel material to be sealed to
specification of its manufacturer.
*Plastic pipe may require an adapter (not provided) to
transition between the air inlet connection on the appliance
and the plastic air inlet pipe.
16
100 feet
100 feet
100 feet
Equivalent Vent
Vent
Length
Size
3 feet
2 inch
3 feet
3 inch
Installation & Service Manual
™
F I R E T U B E
⚠WARNING Using air intake materials other than those
specified can result in personal injury,
death or property damage.
The use of double-wall vent or insulated
NOTICE
material for the combustion air inlet pipe is
recommended in cold climates to prevent
the condensation of airborne moisture in
the incoming combustion air.
Sealing of Type "B" double-wall vent material or galvanized
vent pipe material used for air inlet piping on a sidewall or
vertical rooftop Combustion Air Supply System:
a.
Seal all joints and seams of the air inlet pipe using either
Aluminum Foil Duct Tape meeting UL Standard 723 or
181A-P or a high quality UL Listed silicone sealant such as
those manufactured by Dow Corning or General Electric.
b.
Do not install seams of vent pipe on the bottom of
horizontal runs.
c.
Secure all joints with a minimum of three (3) sheet metal
screws or pop rivets. Apply Aluminum Foil Duct Tape or
silicone sealant to all screws or rivets installed in the vent
pipe.
d. Ensure that the air inlet pipes are properly supported.
The PVC, CPVC, or ABS air inlet pipe should be cleaned and
sealed with the pipe manufacturer's recommended solvents
and standard commercial pipe cement for the material used.
The PVC, CPVC, ABS, or Flex Duct air inlet pipe should
use a silicone sealant to ensure a proper seal at the appliance
connection and the air inlet cap connection. Dryer vent or
flex duct should use a screw type clamp to seal the vent to
the appliance air inlet and the air inlet cap. Proper sealing of
the air inlet pipe ensures that combustion air will be free of
contaminants and supplied in proper volume.
When a sidewall or vertical rooftop combustion air supply
system is disconnected for any reason, the air inlet pipe
must be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.
Failure to properly seal all joints and seams
⚠ DANGER
as required in the air inlet piping may
result in flue gas recirculation, spillage
of flue products and carbon monoxide
emissions causing severe personal injury
or death.
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