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Whirlpool WFM18 Installation Instructions Manual page 12

80% single-stage multispeed gas furnace

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Proper chimney
termination?
(Check 1)
Yes
Chimney channel
free of solid and
liquid fuel
appliances?
(Check 2)
Yes
Crown in good
condition?
(Check 3)
Yes
Cleanout free of
debris?
(Check 4)
Yes
Liner in good
condition?
(Check 5)
Yes
Dilution air
available?
(Check 6)
Yes
Complete the
installation.
(Check 7)
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.
If the chimney does not meet these termination requirements, but
all other requirements in the checklist can be met, it may be
possible for a mason to extend the chimney. If this will not be
practical, see "Fix 1—Liner Termination."
12
Line, terminate with
No
listed vent cap
(Fix 1)
Change venting
No
arrangements
(Fix 2)
Rebuild crown
(Fix 3)
No
and/or reline
(Fix 4)
Reline
No
(Fix 4)
Reline
No
(Fix 4)
Reline
No
(Fix 4)
Termination 10 ft (3 m) or Less From Ridge, Wall or Parapet
A
B
F
A. 10 ft (3 m) or less
B. 2 ft (61 cm) minimum
C. 3 ft (91.4 cm) minimum
Termination More Than 10 ft (3 m) From Ridge, Wall or
Parapet
B
E
I
A. More than 10 ft (3 m)
B. No height above parapet
required when distance from
walls or parapet is more than
10 ft (3 m).
C. 3 ft (91.4 cm) minimum
D. Chimney
B
C
D
E
A
B
C
E
D. Wall or parapet
E. Chimney(s)
A
C
D
A
F
G
H
C
D
E. Wall or parapet
F. Height above any roof surface
within 10 ft (3 m) horizontally
G. 10 ft (3 m)
H. 2 ft (61 cm) minimum
I. Ridge

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