10
This checklist is only a summary. For detailed information
on each of the procedures mentioned, see the paragraph
referenced with each item.
Proper Chimney
Termination?
(Check 1)
Chimney channel
free of solid and
liquid fuel
appliances?
(Check 2)
Change venting
arrangements
(Fix 2)
Crown in good
condition
(Check 3)
Rebuild crown
(Fix 3)
and/or Reline
(Fix 4)
Reline
(Fix 4)
Reline
(Fix 4)
Cleanout free of
debris?
(Check 4)
Liner in good
condition?
(Check 5)
Reline
(Fix 4)
Dilution air
available?
(Check 6)
Complete the
installation.
(Check 7)
C
HECK
1 - P
ROPER
CHIMNEY
TERMINATION
.
A masonry chimney used as a vent for gas fi red equipment
must extend at least three feet above the highest point where it
passes through the roof. It must extend at least two feet higher
than any portion of a building within a horizontal distance of
10 feet. In addition, the chimney must terminate at least 3 feet
above any forced air inlet located within 10 feet. The chimney
must extend at least fi ve feet above the highest connected
equipment draft hood outlet or fl ue collar.
E
XTERIOR
M
ASONRY
C
HIMNEYS
(C
ATEGORY
I F
URNACES
O
NLY
)
An exterior masonry chimney is defi ned as a “Masonry” chim-
ney exposed to the outdoors on one or more sides below the
roof line.” The ability to use a clay lined masonry chimney
depends on a parameter not associated with interior chimneys.
This variable is the geographic location of the installation.
Researchers have discovered that the winter design tem-
peratures have a direct impact on the suitability of this type
of venting. In most situations, the existing masonry chimneys
will require a properly sized metallic liner.
Wash
Clay Tile Size: 8" x 8" x12"
(Each x 24" Length)
1/2" to 1" Air Space
Second Floor
First Floor
Attic Floor
Roof Line
Throat
Damper
Breech
Clean Out
Fan Assisted
Forced Air
Furnace
Natural Draft
Water Heater
Water Heater
Vent Connector
Basement Floor
F.A.F. Vent
Connector
Typical Multiple Flue Clay Tile Chimney
Figure 3
C
HECKLIST
S
UMMARY
This checklist serves as a summary of the items to be
checked before venting an 80+ furnace into a masonry
chimney. In addition, we recommend that a qualifi ed ser-
viceman use this checklist to perform a yearly inspection of
the furnace venting system.
