507271-02
Page 24 of 52
Issue 1621
Details of Intake and Exhaust Piping Terminations for
Direct Vent Installations
NOTE:
In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged to outdoors.
NOTE:
Flue gas may be slightly acidic and may adversely
affect some building materials. If any vent termination
is used and the flue gases may impinge on the building
material, a corrosion-resistant shield (minimum 24 inches
square) must be used to protect the wall surface. If the
optional tee is used, the protective shield is required.
The shield should be constructed using wood, plastic,
sheet metal or other suitable material. All seams, joints,
cracks, etc. in the affected area should be sealed using an
appropriate sealant. See Figure 33.
Intake and exhaust pipes may be routed either horizontally
through an outside wall or vertically through the roof. In attic
or closet installations, vertical termination through the roof is
preferred. Figures 29 through 39 show typical terminations.
1. Vent terminations are not required to be in the same
pressure zone. You may exit the intake on one side of
the structure and the exhaust on another side (Figure
30. You may exit the exhaust out the roof and the intake
out the side of the structure (Figure 31).
2. Intake and exhaust pipes should be placed as close
together as possible at termination end (refer to
illustrations). Maximum separation is 3” (76 mm) on roof
terminations and 6” (152 mm) on side wall terminations.
3. On roof terminations, the intake piping should terminate
straight down using two 90° elbows (See Figure 29).
4. Exhaust piping must terminate straight out or up as
shown. A reducer may be required on the exhaust piping
at the point where it exits the structure to improve the
velocity of exhaust away from the intake piping. See
Table 10.
5. On field supplied terminations for side wall exit, exhaust
piping may extend a maximum of 12 inches (305 mm)
for 2” PVC and 20 inches (508 mm) for 3” (76 mm) PVC
beyond the outside wall. Intake piping should be as
short as possible. See Figures 34 and 35.
NOTE:
Care must be taken to avoid recirculation of exhaust
back into intake pipe.
Figure 29
Direct Vent Roof Termination Kit
UNCONDITIONED
ATTIC SPACE
1/2" (13 mm) FOAM
INSULATION IN
UNCONDITIONED
SPACE
SIZE TERMINATION
PIPE PER TABLE 10.
3"(76 mm) MAX.
12" (305 mm) ABOVE
AVERAGE SNOW
ACCUMULATION
3" (76 mm) OR
2" (51 mm) PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
8" (203 mm) MIN
Inches(mm)
(15F75 or 44J41)
(IF REQUIRED)
Figure 31
6. On field supplied terminations, a minimum distance
between the end of the exhaust pipe and the end of
the intake pipe without a termination elbow is 8” and a
minimum distance of 6” with a termination elbow. See
Figures 34 and 35.
Figure 30
Table 10
Exhaust Pipe Termination Size Reduction
Summary of Contents for 92G1DF-P
Page 17: ...507271 02 Page 17 of 52 Issue 1621 A95DF 95G1DF and A93DF 92G1DF Table 7 ...
Page 18: ...507271 02 Page 18 of 52 Issue 1621 A95DF 95G1DF and A93DF 92G1DF Table 8 ...
Page 31: ...507271 02 Page 31 of 52 Issue 1621 Figure 49 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC ...
Page 36: ...507271 02 Page 36 of 52 Issue 1621 Figure 56 Typical Wiring Diagram For A93DF 92G1DF ...
Page 37: ...507271 02 Page 37 of 52 Issue 1621 Typical Wiring Diagram Figure 57 For A95DF 95G1DF ...
Page 50: ...507271 02 Page 50 of 52 Issue 1621 Start Up Performance Check List ...
