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Single Flue - Straight Out Back
Min 6" Outside Wall
Min 2" From Fireplace to Wall for Intake Air
Min vent length 12"
Figure 8 displays a single flue (one-pipe) installation. Because the
distance from the fireplace to the first elbow is more than 6 inches,
the first 90° elbow must be considered into the total vent length.
The equivalent length of the second 90° elbow also needs to be
added to the total length, but the third elbow does not since it is the
flue terminal. The total horizontal vent length of the flue system is
7 feet, and the total vertical length is 27 feet. The two 90° elbows
are equivalent to 6 feet, bringing the total to 40 feet.
Figure 9 is an example of how the fireplace can be vented if the
flue outlet is below the level of the floor.
H =
5' + 2' = 7'
V =
27'
(2) - 90° = 6'
Total =
40'
Single Flue - Horizontal Tall Vent Run
Example Calculation Max Vent Run 40 feet
Page 14
VENT EXAMPLES FOR SINGLE FLUE
Figure 7
Figure 8
90° ELBOW
1/4" DOWNWARD SLOPE
PER FOOT TO OUTSIDE
Minimum Exterior Grade Dimension - Single Flue, Horizontal
Venting Below Floor
H =
1'
V =
36'
(1) - 90° = 3'
Total =
40'
Single Flue - Vertical Vent Run
6"
(15.2cm)
MIN.
FLUE CENTER
12" MIN. TO GRADE
(RECOMMENDED 12" MIN.
TO EXPECTED SNOW LEVEL)
Figure 9
Figure 10
30259-6-0314
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