PRODUCT DESIGN
37
2' Min.
2' Min.
3' Min.
10' or Less
Wall or
Parapet
Chimney
Ridge
2' Min.
10' or Less
3' Min.
Chimney
Termination 10 Feet Or Less From Ridge, Wall or
Parapet
Wall or
Parapet
Chimney
NOTE
: No Height
above parapet
required when distance
from walls or parapet is
more than 10 feet.
More than 10'
3' Min.
Ridge
3' Min.
Chimney
2' Min.
More than 10'
10'
Height above any
roof surface within
10 feet horizontally.
Termination More Than 10 Feet From Ridge, Wall or
Parapet
Check 2 - Any solid or liquid fuel appliances vented
into this chimney channel.
Solid fuel appliances include fireplaces, wood stoves, coal
furnaces, and incinerators.
Liquid fuel appliances include oil furnaces, oil-fired boilers
and oil-fired water heaters.
Appliances which burn propane (sometimes referred to as
LP (liquefied petroleum)) gas are considered gas-fired appli-
ances.
Check 3 - Chimney Crown Condition.
Damage from condensate usually shows up first in the crown.
If any of the following trouble signs are present, the condi-
tion 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 mor-
tar 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.
Check 4 - Debris in Cleanout
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
debris. 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).
Check 5 - Liner Condition.
If a metal liner is present, it must be checked. It cannot be
assumed 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 screw-
driver. 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 ap-
pliance outside 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.