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• Horizontal Thru-wall Venting System (Category IV) Installation
This installation utilize the boiler mounted blower to vent the combustion products to the outdoors. Combustion air is taken
from inside the room and the vent is installed horizontally through the wall to the outdoors. Adequate combustion and
ventilation air must be supplied to the boiler room in accordance with the National Fuel Gas Code or, in Canada, the latest
edition of CAN/CGA-B149.1 and .2 Installation Code for Gas Burning Appliances and Equipment.
UL 17-38 Certified Venting Material (e.g. AL29-4C) MUST be used. The vent must be installed to prevent flue gas
leakage. Care must be taken during assembly to insure that all joints are sealed properly and are airtight.
For certain installations, i.e. pool, heat pump, domestic hot water supply with pre-heat tank, PVC or CPVC may be used.
Contact manufacturer for details.
To prevent condensate accumulation in the vent, it is required to install the horizontal portion of vent with a slight upward
slope of not more than 1/4" per foot of horizontal run and
an approved condensate trap must be installed per applicable
codes, so the condensation in the vent pipe drains back to the boiler.
WARNING: For common vent installations contact factory.
WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the
safety and health of inhabitants.
The Stainless Steel non-restrictive direct vent cap must be furnished by the boiler manufacturer in accor-
dance with its listing.
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