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Chimney Connection
Important: Before connecting a vent to a chimney,
make sure the chimney passageway is clear and free of
obstructions. The chimney must be cleaned if
previously used for venting solid fuel appliances or
fireplaces.
• The connector must be installed above the extreme
bottom of the chimney to prevent potential
stoppage of the flue gases.
The connector must be firmly attached and sealed
to prevent it from falling out.
,, To aid in removing the connector, a thimble or slip
joint may be used.
,, The connector must not extend beyond the inner
edge of the chimney as it may restrict the space
between it and the opposite wall of the chimney
(Figure 10).
Do not terminate the vent connector in a chimney that
has not been certified for this purpose. Some local
codes may prohibit the termination of vent connectors
in a masonry chimney.
Vertical Exhaust Gas Vent
Vertical exhaust gas vents must be installed with UL
listed type B vent pipe according to the vent
manufacturer's instructions and the terms of its listing.
It must be connected to the water heater's drafthood by
a certified vent connector or by directly originating at
the drafthood opening.
Vertical gas vents must terminate with a listed cap or
other roof assembly and be installed according to their
manufacturer's instructions.
Gas vents must be supported to prevent damage, joint
separation, and maintain clearances to combustible
materials (Figures 11 and 12).
Important: This gas vent must be terminated in a
vertical position to facilitate the removal of the burnt
gases.
An unused chimney flue or masonry enclosure may be
used as a passageway for the installation of a gas
vent(Figure 12).
Common (combined) venting is allowable with vertical
type B vent systems and lined masonry chimneys. The
vent pipe must be installed according to all local and
state codes or in absence of local and state codes with
the "National Fuel Gas Code", ANSI Z223.1 (NFPA 54)-
latest edition.
Figures 10-12 are examples of vent pipe system
installations and may or may not be typical for your
specific application. Consult the "National Fuel Gas
Code", NFPA54, ANSI Z223.1-1atest edition and the
guidelines set forth by prevailing local codes.
Figure 10
Chimney Termination
Vent System
I
Maintain 3 Ft. Min.._1
clearance
±
6 inches
minimum
Certified Lined
F _himney
2 ft. min. above any object
within 10 ft,
Horizontally
Do not extend
beyond edge
of chimney
Connector
Figure 11
Vertical Gas
Vent System
With Type B
Double Wall
Vent Pipe
Maintain
clearance
t
6 inches
minimum
Cap
2 ft. min. above any object
within 10 ft,
horizontally
Type B Double
Wall Vent Pipe
Maintain
specified
clearance
Figure 12 _,
Venting Through
a Chimney 5 inches min,
with Type B Double
Wall Vent Pipe.
_l'_Listed Vent Cap
Maintain
specified
clearance
Maintain
clearance
±
t
6 inches
minimum
Vent
Connector
Unused chimney
flue or masonry
enclosure
11
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