General Venting Guidelines - RBI FUTERA II Series Installation And Operation Instructions Manual

FUTERA II INSTALLATION AND OPERATION INSTRUCTIONS
Intake Air Option – Horizontal Guidelines
The maximum equivalent length for the horizontal
combustion air pipe on installations that used the Direct
Vent option is 60 ft, 18.3 m. The maximum equivalent length
for the horizontal combustion air pipe on installations that
use the Horizontal Power Vent option is 100 ft, 30.5 m. Each
90° elbow and the combustion air terminal are equal to 10
linear ft, 3.1 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. The certifi ed combustion air terminal from RBI must
be used and installed as shown in Figures 3 and 4.

GENERAL VENTING GUIDELINES

WARNING: The 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 applicable 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.
WARNING: Common vent systems must be
properly engineered and sized to provide a
negative draft of 0.01 to 0.08 in, 0.25 to 2.0 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!
NOTE: A single acting barometric damper must be
installed directly to the boiler/water heater fl ue outlet, if
required. This does not apply to outdoor units or direct
vent positive pressure units.
NOTE: Some venting applications may require the stop
to be removed for smooth operation. The barometric
damper should be located after the fl ue collector, refer
to Figures 2, 7A and 8 for proper location. Be sure that
the damper is mounted horizontally (never vertically).
Carefully follow the instructions provided with the
barometric damper.
In Canada, B149 (7.25 Draft Regulators) states the
damper shall be of double-acting type.
WARNING: To avoid spillage into the room of
dangerous fl ue gas containing carbon monoxide,
the opening in damper must never face against the
fl ow of fl ue gas.
VENT SYSTEM OPTIONS
The Futera II may be vented the following ways:
1) Direct Vent, Positive Pressure, Category III 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 III 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 space in which
the unit is installed.
3) Horizontal Vent, Negative Pressure, Category I
for horizontal vent runs equivalent to more than 60
ft, 18.3 m (90 degree elbow = 10 equivalent feet), a
dedicated wall mounted power venter must be used.
The vent system can be single wall galvanized steel or
type B vent pipe. Combustion air is obtained from the
space in which the unit is installed or from the outdoors.
A barometric damper must be installed when the
horzontal run is longer than 60 equivalent feet (90
degree elbow = 10 equivalent feet). If this is the case, a
power venter must also be used.
If horizontal run is less than 60 equivalent feet, do not
use a barometric damper. Follow applicable instructions
under the "DIRECT VENT, POSITIVE PRESSURE"
section, page 6.
4) Ver tical/Chimney Vent, Negative Pressure,
Category I uses an approved metal chimney system
or masonry chimney. Combustion air is obtained from
the space in which the unit is installed. A barometric
damper must be installed near the fl ue outlet when
venting vertically.
5) Outdoor Installation uses the outdoor option kit.
Barometric damper is not required.
NOTE: All venting, combustion air material supplied by
installer.
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