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inspection, and replacement.
Vent connectors cannot pass through any ceiling, floor,
firewall, or fire partition.
It is recommended (but not mandatory) that a minimum 12
inches of vertical vent pipe be installed on the draft hood
prior to any elbow in the vent system.
IMPORTANT: Existing vent systems must be inspected for
obstructions, corrosion, and proper installation.
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. Also consult local and state
codes for proper chimney sizing and application or, in the
absence of local and state codes, the "National Fuel Gas Code",
ANSI Z223. I(NFPA 54)-current edition.
• The connector must be installed above the extreme bottom
of the chimney to prevent potentially blocking 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 19).
(Figures 20 and 21).
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 21 ).
Common (combined) venting is allowable with vertical type B
vent systems and lined masonry chimneys as tong as proper
draft for the water heater is established under all conditions of
operation. IMPORTANT: DO NOT common vent this water heater
with any power vented appliance.
Figures 19-21 are examples of vent pipe system installations
and may or may not be typical for your specific application.
Consult the "National Fuel Gas Code", NFPA 54, ANSI Z223.1-
current edition and the guidelines set forth by prevailing local
codes.
SUPPORT
*MAINTAIN
CLEARANCE
t
2 FT. MINIMUM ABOVE ANY OBJECT
3 FT. MINtMU! WITHIN 10 FT. HORIZONTALLY
TYPE B DOUBLE
WALLVENTPIPE
**MAINTAIN
CLEARANCE
3FT-MINIMUM I
SUPPORT
STRAP
MAINTAIN
CLEARANCE*
t
LISTED LINED
CHIMNEY
2 FT. MINIMUM ABOVE ANY OBJECT
WITHIN 10FT. HORIZONTALLY
DO NOT EXTEND
OF CHIMNEY
CONNECTOR
CHIMNEY TERMINATION VENT SYSTEM
FIGURE 19.
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 GAS VENT SYSTEM WITH
TYPE B DOUBLE WALL VENT PIPE.
FIGURE 20.
±
MAINTAIN MANUFACTURER'S
SPECIFIED MINIMUM CLEARANCE
T
SUPPORT
STRAP
*MAINTAIN
CLEARANCE
t
VENT
CONNECTOR
SLOPE
I_IN. PBR FT.
MINIMUM
-i_LISTED VENT CAP
_MAINTAIN
SPECIFIED
CLEARANCE
CONNECTOR
UNUSED CHIMNEY
_,--'-FLUE OR MASONRY
ENCLOSURE
Vertical exhaust gas vents must be installed with U.L. 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 draft hood by a
listed vent connector or by directly originating at the draft hood
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
VENTING THROUGH A CHIMNEY WITH
TYPE B DOUBLE WALL VENT PIPE.
2O
FIGURE 21.
, Maintain vent pipe clearance requirements to local, state and/or the
"National Fuel Gas Code",ANSI Z223.1(NFPA 54)-current edition.
** NFPA 211, Standard for Chimneys, Fireplaces, Vents, and Solid
Fuel-Buming Appliances states that these chimneys are intended to
be installed in accordance with the installation ins_uctions provided
with each chimney support assembly. Minimum airspace clearance to
combustible materials should be maintained as marked on the chimney
sections.