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Check Your Chimney
Chimney must be clean, right size, properly constructed
and in GOOD CONDITION.
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Installation must conform to requirements of the
authority having jurisdiction or, in absence of such
requirements, to the National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
o Boiler's induced draft blower has 3" outlet. 3" X
4" increaser fitting is included in parts bag. Locate
increaser fitting on outlet of induced draft blower, and
secure gas-tight with bead of furnished silicone sealant.
Increaser fitting is required on this boiler for Category I
venting, and 4" is minimum permissible vent diameter.
This does not imply vent connector is intended to be 4"
diameter pipe. Vent connector shall be sized according
to appropriate venting tables in the National Fuel
Gas Code and may be required to be larger than 4"
diameter.
Boiler installation for chimney venting is not
complete unless increaser fitting is located and
secured.
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o
These are high efficiency boilers with low stack or
exhaust temperature.
Venting into masonry chimney without liner, line
chimney from top to bottom with either:
A. Listed Type B vent pipe
B. Listed flexible vent liner
C. Poured ceramic liner.
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Outside chimneys should not be used unless they are
(choose one of the following):
A. Enclosed in a chase
B. Lined with Type B vent pipe
C. Use listed flexible vent liner
D. Use certified chimney lining system
6. Vent connector from boiler to chimney should run as
directly as possible with as few elbows as possible.
7. Where possible, it is recommended to common vent
water heater and boiler. Consult appropriate Vent
Sizing Tables in National Fuel Gas Code for specific
requirements of multiple appliance venting.
8. Boiler is only appliance connected to vent, Type B vent
pipe is recommended for vent connector.
9. Slope pipe up from boiler to chimney not less than 1/4"
per foot (21mm/m).
10. End of vent pipe must be flush with inside face of
chimney flue. Use sealed-in thimble for chimney
connection.
11. Fasten sections of vent pipe with sheet metal screws to
make piping rigid. Use stovepipe wires to support pipe
from above.
12. Do not connect to fireplace flue.
13. Do not install damper on this boiler.
Minimum Vent Pipe Clearance
• Use Type B vent pipe through crawl space. Where vent
pipe passes through combustible wall or partition, use
ventilated metal thimble. Thimble should be 4 inches
larger in diameter than vent pipe.
• Boiler installed with single wall vent, must have 6"
clearance between its surface and any combustible
material. New Type B gas vent or flexible liner must be
installed in accordance with instructions furnished with
vent. Maintain clearances as specified for vent pipe.
• Verify vent pipe is fire-stopped where it goes through
floor or ceiling. It should have approved vent cap with
clearances from roof. If clearances are less than shown,
have vent checked by local authorities. Figure 7, Page 11.
• Vent connectors serving appliances vented by natural
draft shall not be connected into any portion of
mechanical draft systems operating under positive
pressure.
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