20
1"(2.54cm)
Maximum
Combustion
Air
Vent
6 - COMBUSTION AIR AND VENT PIPING
FIGURE 6-4
Maintain 12"
clearance above
highest anticipated
snow level or grade
* See Note
Below
Vent
Combustion
Air
1" (2.54cm)
Maximum
Roof overhang
36"(0.9m) Minimum
Maintain 12"(30cm)
clearance above highest
anticipated snow level or
grade
12" (30cm) Minimum
FIGURE 6-5
*Must be less than 4" or greater than 24" Horizontal dis-
tance between end bells of each air intake to prevent fl ue
gas recirculation.
FIGURE 6-7
46-3/4" (1.2 m)
Vent
Combustion Air
1"(2.54cm)
Maximum
**See
Note
*2 or 3" (5.0 or 7.6cm) Diameter
PVC intake/combustion air
Elbow fi eld
supplied
Combustion Air
Note: Securing strap must
be fi eld installed to prevent
movement of termination
kit in side wall
*2" (
5.0cm)
Diameter = 41" Length (1.0m))
3" (7.6cm) Diameter = 47" Length (1.2m)
** Note Overall length may be modifi ed by cutting or
extending both combustion air and vent pipes. 12" is
minimum allowable length and 60" is maximum allowable
length for this dimension. SDR-26 PVC (D2241) only may
be used for extending pipes. Do not use Schedule 40 PVC
or use couplings to extend pipes. Dimension will change if
intake/vent pipes are lengthened or shortened.
1" (2.54cm)
Maximum
OD 3½" (
8.9cm)
- *2" (
5.0cm)
kit
OD 4½" (11.4cm) - 3" (7.6cm)
kit
* Note: 2" For use with models 050/075/100.
3" For use with models 075/100/150/200
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