Owner`s manual

32084-3-0813Page 28
Table 3 - Equivalent Vent Length Example (See Figure 45)
EVL = Equivalent Vent Length
EVL must be greater than or equal to 1’ and less than or equal to 50’
EVL = 5’ straight pipe + 90º elbow + 37’ straight pipe + 90º elbow + 2’ straight pipe = 50’
EVL =
5’
(straight pipe)
+
3’
(90º elbow)
+
37’
(straight pipe)
+
3’
(45º elbow)
+
2’
(straight pipe)
= 50’
Max Vent Run - 50 ft. Equivalent
When installing a horizontal vent termination, the minimum vent
length protruding from the outside wall is 10 inches (304mm). See
Figure 44.
For venting cap, exhaust with 45° elbow.
Notice: Horizontal discharge 45° elbow must be pointed down-
ward. See Figure 44.
Notice: All horizontal runs require a 1/4” per foot rise to run con-
densation back to the wall furnace.
Notice: For each 45° elbow installed, the length of the run
MUST be reduced by 1.5 feet (45 cm). Reduce the length of the
run three feet (91.4 cm) for every 90° elbow. The vent terminal
elbow does not contribute to the overall vent length measure-
ment.
Figure 44
Single Flue - Straight Out Back
90
ELBOW°
2’
(61.0cm)
37’
(11.3m)
5’
(1.5m)
VENT TERMINAL
45° ELBOW
(NOTCOUNTED)
3 FEET
FIRST 90° ELBOW
3 FEET
SLOPE
SLOPE
Figure 45
Example Calculation Max Vent Run 50 feet
Figure 45 displays a single ue (one-pipe) installation. The rst
90° elbow must be considered into the total vent length. The
equivalent length of the second 90° elbow also needs to be add-
ed 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 seven feet, and the total vertical length is 37 feet. The two 90°
elbows are equivalent to six feet, bringing the total to 50 feet.
VENT EXAMPLES FOR SINGLE FLUE
WALL FURNACE INSTALLATION