Finned copper tube gas boilers & water heaters – Boiler Manual
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Single wall galvanized smoke pipe, single wall aluminum pipe,
exible aluminum pipe, PVC or CPVC pipe can be used for the
intake air pipe. It must be sized per Table 3.
Table 3 Intake Air Pipe Sizing (Up to 60 ft)
Model
Size
in mm
500 8 203
750 8 203
1000 8 203
1250 10 254
1500 10 254
1750 12 305
2000 12 305
Note: Max horizontal/vertical intake pipe 60 ft equivalent.
All joints in metal intake air systems must be secured using corro-
sion resistant fasteners and sealed using a suitable Silicone caulk.
If PVC or CPVC is used, the joints must be cleaned with a suitable
solvent and connected using a solvent based PVC cement. e
combustion air system MUST be supported by the building
structure not the boiler/water heater.
A combustion air damper interlocked with the unit
should be installed in the intake air pipe when the
in ltration of subfreezing air could occur, otherwise
the unit could freeze up voiding the warranty!
Intake Air Option – Vertical Guidelines
e maximum equivalent length for the vertical intake air pipe is
60 , 18.3 m. Each 90° elbow and the intake air terminal are equal
to 10 linear , 3.0 m of pipe, see Table 3.
An approved, nonrestrictive intake air terminal must be used. e
intake air terminal must terminate as shown in Figure 3. e
penetration point in the roof must be properly ashed and sealed.
Intake Air Option – Horizontal Guidelines
e maximum equivalent length for the horizontal intake air pipe
is 60 , 18.3 m. Each 90° elbow and the intake air terminal
are equal to 10 linear , 3.0 m of pipe. If horizontal runs exceed
5 , 1.5 m they must be supported at 3 , 0.9 m intervals with
overhead hangers. e certi ed intake air terminal from RBI must
be used, see Figures 1, 2 and 4.
GENERAL VENTING GUIDELINES
e vent installation must be in accordance with Part
7, Venting of Equipment, of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54-latest revision or appli-
cable provisions of the local building codes. Canadian
installations must comply with CAN/CGA B149.1
or .2 Installation Code. Improper venting can result
in excessive levels of carbon monoxide which can
result in severe personal injury or death!
All vent systems must be fully supported by the building structure
and not by the boiler/water heater. Appropriate thimbles and re-
stops must be used where required.
Common vent systems must be properly engineered
and sized, please contact the factory.
A UL listed stainless steel vent system must be used
unless this unit is ed with an RBI supplied non
metallic vent kit. Failure to comply with this warning
can cause excessive levels of carbon monoxide resulting
in severe illness and death!!
For instructions utilizing the non-metallic vent option,
see Addendum (FTF-PVCVO) for PVC and (FTF-
PPVO) for Polypropylene.
VENT SYSTEM OPTIONS
e ue products in the vent system may be cooled below their
dew point and form condensate in the ue. e materials used for
a Category IV vent must be resistant to any corrosive damage
from ue gas condensate. e ue from a Category IV vent system
must have a condensate drain with provisions to properly collect
and dispose of any condensate that may occur in the venting system.
e Futera Fusion may be vented the following ways:
1) Direct Vent, Positive Pressure, Category IV uses a vent
system certi ed to UL 1738 for installations in the United
States, ULC S636 for installations in Canada. Combustion air
is piped from the outdoors to the blower inlet.
2) Side Wall Vent, Positive Pressure, Category IV uses
a vent system certi ed to UL 1738 for installations in the
United States, ULC S636 for installations in Canada. Combus-
tion air is obtained from the space in which the unit is installed.
3) Vertical Vent, Positive Pressure, Category IV uses a
vent system certi ed to UL 1738 for installations in the United
States, ULC S636 for installations in Canada. Combustion air
is obtained from the outdoors or the space in which the unit
is installed.
4) Vertical Vent, Negative Pressure, Category II (common
venting) requires negative pressure in vent (natural dra ).
Requires a metal chimney system approved for Category II
venting. is method is required if common venting multiple
Fusion boilers.
All venting and combustion air material supplied by
installer. All venting materials must be approved for
the application. Consult the vent manufacturer’s
product literature.
e maximum equivalent length for the ue outlet vent
system for Category IV conditions is 60 , 18.3 m.
Use Table 4 for the equivalent lengths per ing. Table
4 - “Category IV Equivalent Length per Fi ing” chart
is meant as a guideline for preliminary sizing. If vent
length approaches 75% of maximum length listed an
engineered vent system calculation must be performed,
consult factory.
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