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The sidewall combustion air inlet cap MUST NOT be installed
above the sidewall flue outlet if it is located within a 10 foot
(3.05 m) radius of the flue outlet.
The sidewall combustion air inlet cap must not be installed closer
than 10 feet (3.05 m) from an inside corner of an
L-shaped structure.
The sidewall combustion air cap as sem bly used MUST
adequately protect the combustion air inlet from wind and
weather.
The sidewall combustion air inlet cap and flue gas outlet MUST
be located on the same sidewall surface and in the same pressure
zone.
Combustion air supplied from outdoors must be free of
contaminants (see Com bus tion and Ventilation Air). To pre vent
recirculation of flue products into the combustion air inlet, follow
all instructions in this section.
Multiple Horizontal Direct Vent Installations
3' HORIZONTALLY
1' BELOW FLUE
FLUE OUTLETS
AIR INLET CAP
FIG. 26 Multiple Horizontal Direct Vent Caps Installed on a
Sidewall
INTELLI-VENT SYSTEMS
The combustion air inlet caps for mul ti ple appliance installations
must maintain the same minimum clearance from the closest vent
cap installed within a 10 foot (3.05 m) radius of the point of flue gas
termination as specified in single appliance installations. Multiple
flue outlet caps may be installed side by side and multiple air inlet
caps may be installed side by side but the minimum clearance of
3 feet (0.91 m) horizontal radius and 12 inches (0.30 m) below the
closest flue outlet to the air inlet cap must be maintained. All
clearance and installation requirements in this sec tion and the
applicable portions of the general Category IV venting section
must be maintained on multiple ap pli ance installations.
An Intelli-Vent system is a Category IV flue installed with a
separate com bus tion air pipe to the outdoors. The
Intelli-Vent system terminates the flue and the combustion air inlet
pipe in different pressure zones. The Intelli-Vent system may
terminate the flue and combustion air in any one of three
configurations.
These are:
(1) The flue on the roof top and combustion air intake
on the sidewall;
(2) The flue on the sidewall and combustion air from
the rooftop;
(3) The flue on the sidewall and the combustion air on
a sidewall other than the sidewall where the flue
is located.
All appliances are shipped from the factory equipped for Category
IV venting system. The optional Intelli-Vent systems require the
installation of specific venting materials that are purchased locally.
Sidewall termination caps for flue products and combustion air
must be purchased from the manufacturer. The sidewall caps for
combustion air and flue products are available as vent kits. The
following is a detailed explanation of the installation re quire ments
for each venting system, components used and part numbers of
vent kits for each model.
Follow all requirements in the General Category IV Venting
sections for proper installation and of venting flue prod ucts to the
outdoors with either a rooftop or a sidewall termination. All other
general installation requirements must be followed.
The Intelli-Vent System requires the installation of an additional
pipe to supply combustion air from outdoors directly to the
appliance. The air inlet pipe must use one of the spec i fied
materials.
FIG. 25 Air Inlet Cap for Sidewall Termination