Smith Cast Iron Boilers GS110W - Manual (Page 13)

GS110 DIRECT VENT BOILER INSTALLATION AND OPERATION INSTRUCTIONS Page 13
Figure 11 - Vertical Positive Pressure Venting (Cat. III)
The vent connector should be sloped up toward the
chimney 1/4" per foot. Ensure that the vent connector
is properly supported and each connection securely
fastened with at least 3 corrosion resistant sheet metal
screws. The termination of the vent pipe must be flush
with the inside of the chimney flue.
CAUTION: The vent connector length must never
exceed 3/4 of the height of the chimney or venting
problems will occur!
Always provide a minimum clearance of 6 inches
between single wall metal vent pipe and any
combustible materials. Type B1 vent may be used,
clearance between it and any combustible material must
be as listed.
WARNING: Failure to maintain minimum
clearances between vent connectors and
combustible materials can result in a fire
causing extensive property damage, severe
personal injury or death!