Vent Examples For Single Flue - Empire Comfort Systems BF28BMN-4 Installation Instructions Manual

Figure 3 displays a single flue (one-pipe) installation. Be-
cause the distance from the heater to the first elbow is more
than 6 inches, the first 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 flue terminal. The
90° ELBOW
3'
H = 5' + 2' = 7'
V = 27'
(2) - 90° = 6'
Total = 40'
5'
Single Flue - Horizontal Tall Vent Run
Example Calculation Max Vent Run 40 feet
Page 12

VENT EXAMPLES FOR SINGLE FLUE

2'
VENT TERMINAL
90° ELBOW
(NOT COUNTED)
27'
FIRST 90° ELBOW
DOES NOT GET COUNTED
WHEN WITHIN 6"
OFF BACK OF HEATER
Figure 3
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 4 is an example of how the heater can be vented if
the flue outlet is below the level of the floor.
Minimum Exterior Grade Dimension - Single Flue, Hori-
zontal Venting Below Floor
Figure 4
27297-5-0511