18
c. all 40 and 50 Gallon 40,000 Btu/hr Models
In the carton is supplied:
1. Two 3” inlet and outlet PVC Schedule 40 - 45° vent caps.
All other piping must be supplied by the supplier.
fIGure 20.
* If making an immediate horizontal run of vent off the blower, two
3” PVC or ABS schedule 40 street elbows are required.
ventInG sYsteM eXaMple InstallatIons for
all Models
The vent piping cannot under any circumstances be run downhill.
fIGure 21.
correct installation of the vent piping:
1. Horizontal runs require a minimum 1/8” (3.2 mm) rise per five feet
of length.
fIGure 22.
2. The total vertical and horizontal vent runs cannot exceed the
maximum length with the number of 90° elbows as specified in
the table below. If more elbows are required, the venting distance
must be reduced 5 feet (1.5m) for every 90° elbow:
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 23.
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 24.
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 25.
note: when determining the location of the openings in the
outside wall, allow for the 1/8” (3.2 mm) rise per five feet (1.5
m) of length required in the horizontal run.
