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VI Venting
Vent installation must be in accordance with local building codes, or the local authority having jurisdiction, or Chapters 7 and
10 of the National Fuel Gas Code, NFPA 54/ANSI Z 223.1.
Typical vent installation is illustrated by Figure 8. The components of vent installation are boiler draft diverter, vent damper,
vent connector and chimney. The AWI and TWI series boilers are equipped with a draft diverter which is built into the boiler;
do not attempt to install an external draft hood.
1) Acceptable Chimneys - The following chimneys may be used to vent AWI or TWI series boilers:
• Listed Type B or L gas vent - Install in accordance with the manufacturer’s instructions, the terms of its listing,
and applicable codes.
• Masonry Chimney - The masonry chimney must be constructed in accordance with the Standard for Chimneys,
Fireplaces, Vents, and Solid Fuel Burning Appliances (NFPA 211) and lined with a clay liner or other listed lining
system. Do not vent an AWI or TWI series boiler into an unlined chimney.
FIGURE 6: ALL AIR FROM OUTDOORS, USING
OPENINGS INTO BOILER ROOM
FIGURE 7: ALL AIR FROM OUTDOORS, USING
HORIZONTAL DUCTS INTO BOILER ROOM
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