State SDV 75 70 NE/PE - Manual (Page 18)

18
VENTING SYSTEM EXAMPLE INSTALLATIONS FOR
ALL MODELS
Do not run the vent piping downward under any circumstances.
See Figure 18.
FIGURE 18.
Correct installation of the vent piping:
1. Horizontal runs require a minimum 1/8” (3.2 mm) rise per fi ve feet
of length.
FIGURE 19.
2. The total vertical and horizontal vent runs cannot exceed the
maximum length with the number of 90° elbows as specifi ed in
the table below. If more elbows are required, the venting distance
must be reduced 5 feet (1.5 m) for every 90° elbow:
TABLE 1: The number of 90° elbows shown in the table is for both
the intake air and vent pipes. IE: The vent pipe can contain three 90°
elbows, the intake air pipe can also contain three 90° elbows.
3" DIA. VENTS MAX.
LENGTH (FT.)
NUMBER OF 90°
ELBOWS*
45 1
40 2
35 3
*NOTE: Two 45° elbows are equivalent to one 90° elbow. One 90°
elbow equals 5 feet (1.5 m) of equivalent vent length.
FIGURE 20A.
FIGURE 20B.
3. Minimum vent length for all models is 18 inches (46 cm).
VENT PIPE SEPARATION
The inlet and outlet vent pipes must be separated by a minimum
distance of 6 1/2 inches (16.5 cm) up to 24 inches (61 cm)
maximum.
FIGURE 21.
CUTTING OPENINGS THROUGH AN OUTSIDE WALL
AND COLLAR INSTALLATION
After reading the manual and determining the location for the
opening in the wall, cut one 3 1/2” (9 cm) diameter hole for the
inlet vent piping and one 3 1/2” (9 cm) diameter hole for the outlet
vent piping through an exterior wall, see Figure 22.
Note: When determining the location of the openings in the
outside wall, allow for the 1/8” (3.2 mm) rise per fi ve feet (1.5
m) of length required in the horizontal run.