Instruction manual

10
Typical Multiple Flue Clay Tile Chimney
Checklist Summary
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 qualified serviceman use this
checklist to perform a yearly inspection of the furnace venting
system.
This checklist is only a summary. For detailed information on
each of the procedures mentioned, see the paragraph referenced
with each item.
This inspection is based upon a draft topical report, “Masonry
Chimney Inspection and Relining,” issued by the Gas Research
Institute. While not yet finalized, we believe this report represents
the best information on this subject which is currently available.
Check 1—Proper Chimney Termination
A masonry chimney used as a vent for gas-fired equipment must
extend at least 3 ft (91.4 cm) above the highest point where it
passes through the roof. It must extend at least 2 ft (61 cm)
higher than any portion of a building within a horizontal distance
of 10 ft (3 m). In addition, the chimney must terminate at least 3 ft
(91.4 cm) above any forced air inlet located within 10 ft (3 m). The
chimney must extend at least 5 ft (1.5 m) above the highest
connected equipment draft hood outlet or flue collar.
A. Crown
B. Wash
C. Roof line
D. Clay tile size: 8" x 8" x
12" (24.3 cm x 24.3 cm
x 30.5 cm) (each x 24"
[61 cm] length)
E. Attic floor
F.
¹⁄₂ " to 1 " (1.3 cm to
2.5 cm) air space
G. Second floor
H. First floor
I. Water heater vent
connector
J. Natural draft water
heater
K. Basement floor
L. Fan-assisted
forced air furnace
M. Forced air furnace
vent connector
N. Clean out
O. Breech
P. D a m p er
Q. Throat
R. Clay tile size:
generally 12" x 12"
(30.5 cm x 30.5 cm)
(24" [61 cm] length)
Goodman 69
Possiblility of property damage, personal injury or death.
Damaging condensation can occur inside masonry
chimneys when a single fan-assisted Category I appliance
(80% AFUE furnace) is vented without adequate dilution
air. Do not connect an 80% furnace to a masonry chimney
unless the furnace is common vented with a draft hood
equipped appliance or the chimney is lined with a metal
liner or Type B metal vent. All installations using masonry
chimneys must be sized in accordance with the
appropriate venting tables. If an 80% furnace is common
vented with a draft hood equipped appliance, the potential
for condensation damage may still exist with extremely
cold conditons, long vent connectors, exterior chimneys
or any combination of these conditions. The risk of
condensation damage is best avoided by using the
masonry chimney as a pathway for properly-sized metal
liner or Type B metal vent.
WARNING
Mult Flue Clay Chimney
G 2009
AB
R
C
D
E
F
G
H
I
J
M
K
L
N
O
P
Q
Flowchart
G
2009
No
Yes
No
Yes
Proper chimney
termination?
(Check 1)
Line, terminate with
listed vent cap
(Fix 1)
Chimney channel
free of solid and
liquid fuel
appliances?
(Check 2)
Change venting
arrangements
(Fix 2)
No
No
No
No
Yes
Yes
Yes
Yes
Rebuild crown
(Fix 3)
and/or reline
(Fix 4)
Reline
(Fix 4)
Reline
(Fix 4)
Reline
(Fix 4)
Crown in good
condition?
(Check 3)
Cleanout free of
debris?
(Check 4)
Liner in good
condition?
(Check 5)
Dilution air
available?
(Check 6)
Complete the
installation.
(Check 7)