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34-53 08/14
WARNING – Adequate clean combustion air must be provided to the appliance. Under no circumstances
should the appliance ever be under a negative pressure. Particular care should be taken when exhaust fans,
compressors, air handling units, etc. may rob air from the appliance. The combustion air supply must be
completely free of any chemical or fumes, which may be corrosive to the appliance. Some common chemical
fumes to avoid are fluorocarbons and other halogenated compounds, most commonly present as
refrigerants or solvents, such as Freon, trichloroethylene, perchlorethylene, chlorine, etc. These chemicals,
when in contact with the equipment or when burned, form acids which quickly attack the tubes, flue
collector, stack and other appliance and auxiliary equipment. The result of inadequate clean combustion air
or negative pressure can be premature unwarranted product failure or unsafe operation producing carbon
monoxide that could escape into the building. Exposure to carbon monoxide can lead to injury or death.
6.2 Maximum Allowed Remote Combustion Air Inlet Length (Equivalent Length)
A vertical or horizontal remote air inlet system can be connected to this appliance without modification. The
maximum length of field supplied single wall pipe, such as galvanized ventilation pipe, is shown in the chart below
titled Maximum Air Inlet Duct Equivalent Length. Use metal tape or RTV sealant to seal each pipe joint.
Maximum Air Inlet Duct Equivalent Length
Duct Size 6” Duct 7” Duct 8” Duct 9” Duct
Max Equivalent Length
100 feet 130 feet 250 feet 450 feet
To determine the maximum straight length of duct allowed, use the Duct Fitting Equivalent Length chart below to find
the total equivalent length for all duct fittings in your combustion air system. Then subtract this number of feet from
the total equivalent length allowed in Maximum Air Inlet Duct Equivalent Length chart above. The sum of this
calculation is the maximum length of straight duct allowed. If a longer length is required, repeat the calculation using
a larger duct size. No additional deduction is required for the addition of the duct system terminal.
Duct Fitting Equivalent Length
Duct Pipe: 6” Duct 7” Duct 8” Duct 9” Duct
90º Elbow 8 feet 9 feet 10 feet 11 feet
90º Long Radius Elbow 5 feet 5 feet 5 feet 6 feet
45º Elbow 5 feet 5 feet 5 feet 5 feet
The following remote air duct information is provided for use in design calculations, if needed.
Remote Air Duct Specifications
Boiler
Input Mbtu
Required
Air (SCFM)
Max Duct Loss
(inches Water)
1500 325 0.784
1800 390 1.11
2000 433 1.356
6.3 Remote Combustion Air Cap
A UL Listed air intake vent termination cap MUST be attached to the remote combustion air vent termination to
adequately protect the combustion air inlet from wind and weather. A UL Listed air intake termination cap is available
from Riverside Hydronics and may have shipped with the boiler as a purchased option.
6.4 Vertical or Horizontal Remote Air Duct Termination
• Air inlet and exhaust vents should terminate in the same wind pressure area whenever possible.
• Air inlet must be located no less than 3 feet (0.91m) below the exhaust terminal if they are within 10 feet (3.05 m)
of each other.
• If terminating through the roof, the air inlet must terminate at least 12 inches (0.3 m) above roof level and at least
12 inches (0.3 m) above snow levels.
• If terminating through a sidewall, the air inlet must terminate at least 12 inches (0.3 m) above grade and/or at
least 12 inches (0.3 m) above normal snow levels.
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