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VENTING SUPPORTS
Care must be taken in the installation of the venting system
that adequate support is maintained throughout the installation
process. When extending more than 10 feet (3.0m) vertically,
vertical support kits are required once every 10 feet (3.0m) of
vertical run. Vertical support is also re quired immedi ately after
any transi tion (elbow, tee, etc.) to vertical of over 10 feet (3.0m) of
run and after any offset in the vertical run.
The support brackets (supplied in the Vertical Support Kit) are to be
secure ly fastened to a solid vertical member of the building using the
appropriate fasteners; i.e., wood screws for wood framing, machine
or tapping screws for structural steel or masonry anchors for solid
masonry. The bracket should be located so that it will not interfere with
any joints of the venting system. The bottom most support bracket
should be located directly above the first transition from horizontal to
vertical, see Figure 10. Refer to Figures 12, 12A, 12B and 12C.
If a means of support for the brackets are not available and
horizontal vent sections are present, install hanger straps
(made from non-combustible material) as close to the points of
transition as possible. If the horizontal portions of the vent and/or
vent connector are longer than 6 feet (2.0m), then install hanger
straps every 6 feet (2.0m) to support the connector.
DO NOT rivet or screw the straps to the conduit or other wise
puncture the conduit wall. Instead, wrap an extra loop of strap
around the conduit to hold it in position, or attach the strap to
the center screw of the double wall AL 29-4C
if applica ble.
VERTICAL INSTALLATION REQUIREMENTS
1. The vent system must terminate at least 3 feet (1.0m) and
no more than 6 feet (2.0m) above the roof line and no closer
than 10 feet (3.0m) from any wall or verti cal structure. If the
exhaust vent terminal is within 10 feet (3.0m) of a wall or
parapet, it must extend a minimum of 2 feet (610mm) above
the wall or parapet, see Figures 11 and 12A.
2. For direct vent installations, the total distance of the vent system
from the boiler vent connector to the vertical vent termination
should not exceed 70 equivalent feet (21.3m). A maximum of three
90° elbows can be used. Minimum vertical vent is 7 equivalent
feet (2.1m) for direct vent installations. Standard minimum vertical
vent length is 7 feet (2.1m), plus Boot-Tee. See Figures 11, 12A,
12B, and 12C for differences between standard and direct
vent installations.
3. An AL 29-C
Vent Vertical Vent Terminal must be used at
®
the termina tion.
4. Maintain a minimum of 6 feet (2.0m) separation between
the air intake and the exhaust terminals.
HORIZONTAL INSTALLATION REQUIREMENTS
1. The vent system must terminate with a AL 29-4C® Vent
Through-the-Wall Termination (TWT). Plan the terminal
location based on the dimensions shown in Figure 9G. Do
not locate the terminal within 8 feet (2.5m) of an inside corner
of a building or adjacent to outside walls, shrubs or other
such objects that may cause adverse wind conditions in the
immediate area.
2. The TWT should be located not less than 12 inches
(305mm) above grade or, in geographical areas where
snow accumulates, no less than 12 inches (305mm)
above antici pated snow line. Ensure that TWT is protected
against blockage which may occur during ice build up or
snowstorms.
The TWT should terminate at least 3 feet (1.0m) above
any forced air inlet within 10 feet (3.0m), except when the
forced air inlet is the combustion air intake of a direct vent
appliance. The TWT should terminate at least 4 feet (1.2m)
below, 4 feet (1.2m) horizontally from or 1 foot (305mm)
above any door, window or gravity air inlet into any building
as provided in the current edition of the nation al fuel gas
code ANSI Z223.1, see Figure 9G.
In addition, a minimum clearance of 4 feet (1. 2m)
horizontally from, and in NO CASE ABOVE OR BELOW,
unless the 4 feet (1.2m) of horizontal distance is main-
tained from electric meters, gas meters, regulators and
relief equip ment.
3. This horizontal exhaust vent system must pitch upward toward
the termination at 1/4 inch per foot (21mm per meter).
vent coupling,
®
4. The TWT is designed such that the building is protected
from degradation by flue gas and condensate. Howev e r, if
additional protection is desired, install against the wall a non-
corrosive metal sheet under the TWT.
5. Due to the normal formation of water vapor in the
combustion process, horizon tal terminations must not
be located over areas of pedestrian or vehicular traffic,
(i.e., public walkways or over areas where condensate
could create a nuisance or hazard). This is especially
true in colder climates where ice buildup is likely to
occur. A.O. Smith Corporation will not be held liable
for any personal injury or property damage due to any
dislodg ing of ice.
DIRECT VENT INSTALLATION REQUIREMENTS
Follow guidelines in the "HORIZONTAL INSTALLATION
REQUIREMENTS" section for exhausting of flue products.
BLOWER CONDENSATE TRAY
The VF boilers are equipped with a blower condensate tray
installed underneath the blower. This Condensate Tray is
to collect any moisture that forms on the outside of the
blower when the unit is direct vented and the outside air is
colder than the room air in which the boiler is in. The tray
protects against moisture reaching some of the electronic
components located below the blower.
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