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SECTION J-2 Horizontal Thru-Wall Venting (Category III)
Fig. #9229.1
HORIZONTAL THRU-WALL VENTING (CATEGORY III) TABLE
• Horizontal Thru-wall Venting System (Category III) Installation
These installations 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.
31
OPTIONAL FLUE
EXHAUST VENTING
9"
MIN.
FLUE EXHAUST
VENT CAP
INSULATED
EXHAUST
VENTING
12" MIN
.
B
OILER UNIT
CONDENSATE
TRAP
COMBUSTION
AIR FILTER