Specifications

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VENT EXAMPLES FOR SINGLE FLUE
Figure 3 displays a single ue (one-pipe) installation. Be-
cause the distance from the heater to the rst elbow is more
than 6 inches, the rst 90° elbow does need to be consid-
ered 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 ue terminal. The
total horizontal vent length of the ue 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 4 is an example of how the heater can be vented if
the ue outlet is below the level of the oor.
2’
5’
27’
VENT TERMINAL
90° ELBOW
(NOT COUNTED)
90° ELBOW
3’
FIRST 90° ELBOW
DOES NOT GET COUNTED
WHEN WITHIN 6”
OFF BACK OF HEATER
Figure 3
Single Flue - Horizontal Tall Vent Run
Example Calculation Max Vent Run 40 feet
H = 5’ + 2’ = 7’
V = 27’
(2) - 90° = 6’
Total = 40’
Figure 4
Minimum Exterior Grade Dimension - Single Flue, Hori-
zontal Venting Below Floor