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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 35.
7. If intake and exhaust piping must be run up a side wall to
position above snow accumulation or other obstructions,
piping must be supported. At least one bracket must be
used within 6" from the top of the elbow and then every
24" (610mm) as shown in Figure 35, to prevent any
movement in any direction. When exhaust and intake
piping must be run up an outside wall, the exhaust
piping must be terminated with pipe sized per Table 22.
The intake piping may be equipped with a 90° elbow
turndown. Using turndown will add 5 feet (1.5m) to the
equivalent length of the pipe.
8. A multiple furnace installation may use a group of up
to four terminations assembled together horizontally, as
shown in Figure 30.
EXHAUST
VENT
5"
(127mm)
INTAKE
AIR
18" MAX.
(457mm)
EXHAUST VENT
Inches (mm)
optional intake elbow
Figure 30. Optional Vent Termination for Multiple Unit
Installation of Direct Vent Wall Termination
EXHAUST
VENT
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
Figure 31. Direct Vent Concentric Rooftop
Termination
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
31-5000723 Rev. 0
12"
(305mm)
5-1/2"
(140mm)
Front View
12" (305mm) Min.
above grade or
INTAKE
cumulation.
AIR
Side View
FLASHING
INTAKE
(Not Furnished)
AIR
SHEET METAL STRAP
(Clamp and sheet metal strap
must be field installed to support
the weight of the termination kit.)
FIELD-PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT LARGER VENT
PIPE SIZE TO TERMINATION
8" - 12"
(203mm - 305mm)
Minimum 12" (305mm)
INSULATION (optional)
above chimney top
plate or average snow
accumulation
* SIZE TERMINATION
PIPE PER EXHAUST
PIPE TERMINATION
SIZE REDUCTION
TABLE
NOTE: Do not discharge exhaust gases directly into any chimney
or vent stack. If vertical discharge through an existing unused
chimney or stack is required, insert piping inside chimney until
the pipe open end is above top of chimney and terminates as
illustrated. In any exterior portion of chimney, the exhaust vent
must be insulated.
Figure 32. Direct Vent Application Using Existing
FIELD-PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT LARGER VENT
PIPE SIZE TO TERMINATION
EXHAUST
VENT
INTAKE
AIR
Figure 33. Direct Vent Concentric Wall Termination
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
2" EXTENSION FOR 2" PVC PIPE
1" EXTENSION FOR 3" PVC PIPE
FURNACE
INTAKE
PIPE
Figure 34. Flush-Mount Side Wall Termination 51W11
Page 45
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE *
3" - 8"
EXHAUST VENT
(76mm -
1/2" (13mm)
203mm)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
INTAKE PIPE
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
SHEET
METAL TOP
PLATE
3" - 8"
(76mm -
203mm)
INSULATE
TO FORM
SEAL
Chimney
OUTSIDE
INTAKE
WALL
AIR
INTAKE
CLAMP
AIR
(Not Furnished)
GRADE
FURNACE
EXHAUST
4''
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
ALTERNATE
INTAKE PIPE
EXTERIOR
PORTION OF
CHIMNEY
EXHAUST
VENT
12" (305mm) Min.
above grade or
average snow
accumulation.
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