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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 every 24"
(610 mm) as shown in Figure 21. Exhaust and
intake piping that is run up a wall is considered to
be in an unconditioned space, so piping should be
sized according to Table 5. The intake piping may be
equipped with a 90° elbow turndown. Using a turndown
will add 5 feet (1.5 m) 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 28.
EXHAUST
VENT
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
Figure 25. Direct Vent Concentric Rooftop
Termination
71M80, 69M29 or 60L46 (US)
41W92 or 41W93 (Canada)
2" EXTENSION FOR 2" PVC
PIPE1" EXTENSION FOR 3"
PVC PIPE
FURNACE
INTAKE
PIPE
Figure 26. Flush-Mount Side Wall Termination
Page 22 of 74
1 1/2" (38mm) accelerator
provided on 71M80 & 44W92
kits for -045 and -070 models
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 DIFFERENT VENT
PIPE SIZE TO TERMINATION
FURNACE
EXHAUST
4''
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
(
all -45, -070 and -090 units)
51W11
FIELD-PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT DIFFERENT VENT
PIPE SIZE TO TERMINATION
EXHAUST
VENT
INTAKE
AIR
Figure 27. Direct Vent Concentric Wall Termination
71M80, 69M29 OR 60L46 (US)
41W92 or 41W93 (Canada)
EXHAUST
VENT
INTAKE
AIR
Inches (mm)
optional intake elbow
Figure 28. Optional Vent Termination for Multiple Unit
Installation of Direct Vent Wall 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 29. Direct Vent Application Using Existing
Issue 2346
1-1/2" (38mm) accelerator
provided on 71M80 & 44W92
kits for -045 and -070 models
OUTSIDE
INTAKE
WALL
AIR
12" (305mm) Min.
INTAKE
CLAMP
AIR
above grade or
(Not Furnished)
average snow
accumulation.
GRADE
(305mm)
5-1/2"
5"
(140mm)
(127mm)
18" MAX.
Front View
(457mm)
EXHAUST VENT
12" (305mm) Min.
above grade or
INTAKE
cumulation.
AIR
Side View
ANGLE-CUT IN DIRECTION
3" - 8"
(76mm -
203mm)
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
EXHAUST
VENT
12"
STRAIGHT-CUT OR
OF ROOF SLOPE *
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
ALTERNATE
INTAKE PIPE
EXTERIOR
PORTION OF
CHIMNEY
508364-01
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