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• A barometric damper (draft control) is supplied with all models, unless the CAT34 option is ordered. If the boiler
was ordered with the CAT34 option, but is going to be installed with a Category I vent system, a barometric
damper and vent size increaser (for attachment of the vent connector to the boiler vent connection) sized to
match the required Category I vent diameter, must be obtained from Riverside Hydronics. Attach the properly
sized vent increaser to the boiler vent connection with three sheet metal screws. A properly installed and
adjusted barometric damper helps stabilize draft and regulate high updraft. Conventional vented multiple unit
installations with combined venting require barometric dampers to regulate draft at each unit. Adjust the
barometric damper to 0.04 inches water column updraft, when used. Follow the barometric damper
manufacturer’s installation instructions.
• The draft in vent should be within a range of -.02 and -.08” W.C.
• A UL, ULC, ETL or CSA listed vent terminal, suitable for Category I products, must be installed to adequately
protect the gas vent from wind and weather.
• The vent terminal must extend at least 3 ft (.09 m) above the highest point where it passes through the roof of a
building and at least 2 ft (.06 m) higher than any portion of a building within a horizontal distance of 10 ft. (3.0 m).
• The vent cap must terminate at least 3 feet (0.91 m) above any forced air inlet within 10 feet (3.05 m); 4 feet
(1.22 m) below, 4 feet (1.22 m) horizontally from or 1 foot (0.3 m) above any door, window or gravity air inlet to
the building; 1 foot (0.3 m) above grade, 1 foot (0.3 m) above the highest snow levels and must terminate at least
7 feet (2.13 m) above grade when located adjacent to public walkways or gathering areas.
• The vent terminal must not be installed closer than 3 feet (0.91 m) from an inside corner of an L-shaped
structure.
WARNING: Do not combine appliances utilizing Category I or Category II venting into the same vent system
with appliances utilizing Category III or Category IV venting. This could cause unsafe operation and the
potential for poisonous carbon monoxide to enter occupied areas. Such improper installation can cause
property damage, personal injury, exposure to hazardous materials or death.
Conventional Venting Through the Wall Venting
7.3 CATEGORY III or IV VENTING
When properly installed with a UL, ULC, ETL or CSA listed, stainless steel, Category III or Category IV vent, the
appliance operates with a positive vent static pressure and with a vent gas temperature that avoids excessive
condensate production in the vent. Although the appliance can be installed to operate and require Category III
vent materials, Category IV vent materials can be substituted, but are not required.
The listed Category III or Category IV, stainless steel gas vent connected to this appliance may terminate either
above the roof surface or through the side wall. It must comply with the latest edition of the National Fuel Gas Code,
ANSI Z223.1 / NFPA 54 or, in Canada, CAN/CSA B149.1-10 Installation Codes, and the applicable provisions of the
local building codes.
• IMPORTANT: Do not use plastic venting of any type.
• Remove the vent increaser (if equipped) from the boiler vent connection. The Category III or IV venting systems
must connect directly to the 5-7/8 inch boiler vent connection and must not use the vent increaser as part of the
vent system.
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