12
Flexible liners should be hung straight or nearly straight. If it is
spiraled 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
appliances 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 connec-
tor 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).
C
HECK
6 - D
ILUTION
A
IR
.
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
connector does not include a vent damper. If dilution air will not
be available, the chimney must be relined (Fix 4).
C
HECK
7 - C
OMPLETE
THE
I
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
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:
Appliances which burn propane (sometimes referred to as LP (liq-
uefied petroleum)) gas are considered gas-fired appliances.
C
HECK
3 - C
HIMNEY
C
ROWN
C
ONDITION
.
Damage from condensate usually shows up first in the crown. If
any of the following trouble signs are present, the condition of the
crown is not satisfactory:
a) Crown leaning
b) Bricks missing
c) Mortar missing
d) Tile liner cracked
e) No tile liner
f) Salt staining at mortar joints. (White stains, and mortar
becomes sandy and/or erodes.)
For problems a, b, or c, see Fix 3. If problems d, e, or f are present,
see Fix 4. IMPORTANT: It may be necessary to follow both Fix 3 and
Fix 4.
C
HECK
4 - D
EBRIS
IN
C
LEANOUT
A cleanout (dropleg) must be present such that the upper edge of
the cleanout cover is at least 12 inches below the lower edge of the
lowest chimney inlet opening.
A chimney without a cleanout could become partially blocked by
debris. If no cleanout is present, the chimney must be relined (Fix
4). Remove the cleanout cover, and examine the cleanout for de-
bris. If significant amounts of any of the following are found:
•
Fuel oil residue
•
Bricks
•
Mortar or sand
•
Pieces of the tile liner
•
Rusted pieces of the metallic liner - reline the chimney
(Fix 4).
C
HECK
5 - L
INER
C
ONDITION
.
If a metal liner is present, it must be checked. It cannot be as-
sumed that all existing metal liners are correctly installed and in
good condition.
Remove the lowest existing vent connector, and examine the inside
of the elbow or tee at the base of the liner. A small amount of soot
may be considered acceptable, provided the installer vacuums it
away. If rusted pieces of the liner have collected here, the metal
liner must be removed and replaced (Fix 4).
Next, gently tap the inside of the liner with a Phillips screwdriver.
If the screwdriver perforates the liner, or if the tapping does not
sound like metal hitting metal, the liner must be removed and
replaced (Fix 4).
Remember that all appliances must be vented inside the liner.
Venting one appliance inside the liner and another appliance out-
side the liner is not acceptable.
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.
