Fi
d
b
b il
&
h
B il
M
l
Finned copper tube gas boilers & water heaters – Boiler Manual
5
F
F
Table 3
Intake Air Pipe Sizing
Model
For Vertical
For Horizontal
Size
(Up to 60’)
(Up to 60’)
in
mm
in
mm
500
8
203
6
152
750
8
203
6
152
1000
8
203
6
152
1250
10
254
8
203
1500
10
254
10
254
1750
12
305
12
305
2000
12
305
12
305
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.
Th
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
infi ltration of subfreezing air could occur, otherwise
the unit could freeze up voiding the warranty!
Intake Air Option – Vertical Guidelines
Th e maximum equivalent length for the vertical intake air pipe is
60 ft
,
18.3 m
. Each 90° elbow and the intake air terminal are equal
to
10 linear ft
,
3.0 m
of pipe, see Table 3.
An approved, nonrestrictive intake air terminal must be used. Th e
intake air terminal must terminate as shown in Figure 3. Th e
penetration point in the roof must be properly fl ashed and sealed.
Intake Air Option – Horizontal Guidelines
Th e maximum equivalent length for the horizontal intake air pipe
is
60 ft
,
18.3 m
. Each 90° elbow and the intake air terminal
are equal to 10 linear ft , 3.0 m of pipe. If horizontal runs exceed
5 ft
,
1.5 m
they must be supported at
3 ft
,
0.9 m
intervals with
overhead hangers. Th e certifi ed intake air terminal from RBI must
be used, see Figures 1, 2 and 4.
GENERAL VENTING GUIDELINES
Th 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 fi re-
stops must be used where required.
Common vent systems must be properly engineered
and sized to provide a negative draft of .03 in, 0.8 mm
to .1 in, 2.5 mm W.C. at the fl ue outlet. Common
positive pressure vent systems are not to be used.
Improper installation can result in excessive levels of
carbon monoxide which can cause severe personal
injury or death!
VENT SYSTEM OPTIONS
Th e fl ue products in the vent system may be cooled below
their dew point and form condensate in the fl ue. Th e materials
used for a
Category IV
vent must be resistant to any corrosive
damage from fl ue gas condensate. Th e fl 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.
Th e Futera III may be vented the following ways:
1)
Direct Vent, Positive Pressure, Category IV
uses a vent
system certifi 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 certifi 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/Chimney Vent, Negative Pressure, Category II
uses a metal chimney system approved for Category II.
4)
Vertical Vent, Positive Pressure, Category IV
uses a vent
system certifi 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.
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.
