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used as a vent for the gas appliances. However, the installer must
keep in mind the following factors which may render the tile liner
unsuitable for use as a vent:

•

Extremely cold weather

•

Long vent connectors

•

Masonry chimneys with no air gap between the liner and
the bricks. (In practice, this can be difficult to detect.)

•

Exterior chimneys (The tables in National Fuel Gas Code
NFPA 54/ANSI Z223.1 - latest edition and in the National
Standard of Canada, CAN/CSA B149.1 and CAN/CSA
B149.2 - latest editions and amendments assume interior
chimneys.)

If, in the judgment of the local gas utility, installer, and/or local
codes; one or more of the above factors is likely to present a prob-
lem, the chimney must be relined (Fix 4).

1 - L

INER

ERMINATION

Any cap or roof assembly used with a liner must be approved by the
liner manufacturer for such use. The liner and cap/roof assembly
must then terminate above the roof in accordance with the
manufacturer’s instructions.

In some cases, a shorter extension above the roof may be possible
with a liner than would be required with a masonry chimney.

For further information on relining, see Fix 4.

2 -C

HANGE

ENTING

RRANGEMENTS

If the masonry chimney has more than one channel, it may be
possible to vent the gas appliances into one channel and vent the
solid or liquid fuel appliance(s) into another channel(s). Do not vent
an 80+ Furnace inside of a metal liner with other appliances vented
outside the liner.

Alternatively, the homeowner may agree to discontinue use of the
fireplace (solid fuel appliance). If so, the tile liner must be cleaned
to remove creosote buildup. The fireplace opening must then be
permanently sealed.

If oil-fired appliance(s) are being replaced by gas-fired appliance(s),
the tile liner must first be cleaned to remove the fuel oil residue.

If none of the above options is practical, the furnace may need to be
vented vertically with a B Vent.

Under some conditions, a 90%+ furnace could be installed rather
than an 80% furnace. The 90%+ furnace can be vented horizontally
or vertically through PVC pipe.

3 - R

EBUILD

THE

ROWN

If the chimney crown is damaged, a qualified mason must repair it
in accordance with nationally recognized building codes or stan-
dards. One such standard which may be referenced is the Standard
for Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances,
ANSI/NFPA 211.

Next, use a flashlight and small mirror to sight up the liner. B vent
must be supported so as to not come into direct contact with the
chimney walls or tile liner. If it is not, it can probably be rehung so as
to be acceptable. A thimble or fire stop may be helpful here.

Flexible liners should be hung straight or nearly straight. If it is spi-
raled in the chimney and in good condition, it should be rehung. To
do this, break the top seal; pull up and cut off the excess liner
length, and refit the top seal. Use caution when doing this, as the
cut edges of flexible liners may be sharp.

The surfaces of the liner must be physically sound. If gaps or holes
are present, the metal liner must be removed and replaced (Fix 4).
Finally, confirm that the metal liner is the correct size for the appli-
ances to be installed. Use the GAMA tables and rules.

If a metal liner is not present, a clay tile liner must be present, or the
chimney must be lined (Fix 4).

Use a flashlight and small mirror at the cleanout or vent connector
to inspect the clay tile liner. If any of the following problems are
present:

•

Tile sections misaligned

•

Tile sections missing

•

Gaps between tile sections

•

Signs of condensate drainage at the cleanout or vent
connectors

•

Mortar protruding from between tile sections

•

Use of sewer pipe or drainage pipe rather than an approved
fire clay tile reline the chimney (Fix 4).

Next, measure the size of the liner. It may be possible to do this
from the cleanout. The liner must be at least as large as the mini-
mum size established by the tables in National Fuel Gas Code NFPA
54/ANSI Z223.1 - latest edition and in the National Standard of
Canada, CAN/CSA B149.1 and CAN/CSA B149.2 - latest editions
and amendments. If the liner is too small or too large, then the
chimney must be relined (Fix 4).

HECK

6 - D

ILUTION

.....

If gas-fired appliances are to be vented into a clay tile liner, a source
of dilution air is required.

Dilution air cannot be obtained through:

•

Induced draft appliances

•

Natural draft appliances with vent dampers

Sufficient dilution air can ordinarily be obtained through the draft
hood of a natural draft appliance only if the appliance’s vent con-
nector does not include a vent damper. If dilution air will not be
available, the chimney must be relined (Fix 4).

HECK

7 - C

OMPLETE

THE

NSTALLATION

.....

If Checks 1 through 6 have been satisfactory, and the liner is an
acceptable size as determined by the tables in National Fuel Gas
Code NFPA 54/ANSI Z223.1 - latest edition and in the National
Standard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 - latest
editions and amendments, then the clay tile liner can probably be