Allied 95G1UH040BE12X, Запасные части

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507762-01 Issue 1907 Page 25 of 46
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 gasses may impinge on the building
material, a corrosion-resistant shield (minimum 24 inches
square) should be used to protect the wall surface. If the
optional tee is used, the protective shield is recommended.
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 42.
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. Figure 34 through Figure 41 show typical
terminations.
1. Intake and exhaust 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 35). You may exit the exhaust out the roof
and the intake out the side of the structure (Figure 36).
2. Intake and exhaust pipes should be placed as close
together as possible at termination end (refer to
illustrations). Minimum separation is 3” (76mm) on roof
terminations and 6” (152mm) on side wall terminations.
NOTE:
When venting in different pressure zones,
the maximum separation requirement of intake and
exhaust pipe DOES NOT apply.
3. On roof terminations, the intake piping should terminate
straight down using two 90° elbows (see Figure 34).
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 8.
NOTE: Care must be taken to avoid recirculation of
exhaust back into intake pipe.
5. On field-supplied terminations for side wall exit,
exhaust piping may extend a maximum of 12 inches
(305mm) for 2” PVC and 20 inches (508mm) for 3”
(76mm) PVC beyond the outside wall. Intake piping
should be as short as possible. See Figure 42.
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
Figure 42.
UNCONDITIONED
ATTIC SPACE
SIZE PER EXHAUST PIPE
TERMINATION SIZE
REDUCTION TABLE
3” (76MM) MIN.
12” (305MM) ABOVE
AVERAGE SNOW
ACCUMULATION
3” (76MM) OR
2” (51MM) PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
8” (203MM) MIN
Inches (MM)
1/2” (13MM) FOAM
INSULATION IN
UNCONDITIONED
SPACE
Figure 34. Direct Vent Roof Termination Kit
(15F75 or 44J41)
Exhaust
Pipe
Furnace
Inlet Air
Minimum 12 in.
(305MM) above
grade or snow
accumulation
Figure 35. Exiting Exhaust and Intake Vent
(no common pressure zone)
Roof Terminated
Exhaust Pipe
Furnace
Inlet Air
Minimum 12 in.
(305MM) above
grade or snow
accumulation
Figure 36. Exiting Exhaust and Intake Vent
(no common pressure zone)
95G1UHEX Model Termination Pipe Size
*040 and 060 1-1/2” (38 mm)
*080
2” (51 mm)
100
*-040, -060 and -080 units with the flush mount termination
must use the 1-1/2”accelerator supplied with the kit.
Table 8. Exhaust Pipe Termination Size Reduction