Page 20
Details of Exhaust Piping Terminations for NonDirect
Vent Installations.
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 pre
ferred. Figures 20 through 23 show typical terminations.
1.
Exhaust piping must terminate straight out or up as
shown. A 2" (51mm) X 1−1/2" (38mm) reducer for 2"
(51mm) venting, 3" (76mm) x 2" (51mm) reducer for 3"
(76mm) venting is recommended for use on the ex
haust piping at the point where it exits the structure to
improve the velocity of exhaust away from any intake
piping.
2. On field supplied terminations for side wall exits, ex
haust piping should extend a maximum of 12 inches
(305mm) beyond the outside wall for 2" (51mm) pipe,
or a maximum of 20 inches (508mm) for 3" (76mm)
pipe, unless support is provided in the horizontal sec
tion. See figure 21.
FIGURE 20
ROOF TERMINATION KIT
(15F75) LB−49107CC for 2" (51) Venting
(44J41) LB−65678A for 3" (76) Venting
UNCONDITIONED
ATTIC SPACE
3" (76) OR
2" (51) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
Inches(mm)
12" (305mm)
ABOVE AVE.
SNOW
ACCUMULATION
FIGURE 21
1/2" (13) ARMAFLEX
INSULATION IN
UNCONDITIONED SPACE
12" (305) Max. for 2" (51)
20" (508) Max. for 3" (76)
Unless Supported
PVC REDUCER
1/2" (13)
ARMAFLEX
INSULATION
Inches (mm)
TOP VIEW
WALL RING KIT
(15F74) LB−49107CB for 2" (51) Venting
inside
outside
3. If exhaust piping must be run up a side wall to position
above snow accumulation or other obstructions, pip
ing must be supported every 3 feet (.9m) as shown in
figure 16. Refer to figure 22 for proper piping method.
When exhaust piping must be run up an outside wall,
any reduction in exhaust pipe size must be done after
the final elbow.
FIGURE 22
12" (305) ABOVE
AVERAGE SNOW
ACCUMULATION
UNCONDITIONED
SPACE
1/2" (13) FOAM
INSULATION
1/2" (13) FOAM
INSULATION IN
UNCONDITIONED
SPACE
PROVIDE SUPPORT
FOR EXHAUST LINES
EVERY 36" (914)
OUTSIDE WALL
Inches(mm)
SIDE VIEW
WALL RING TERMINATION
(15F74) LB−49107CB for 2" (51) Venting
12" (305) Max. for 2" (51)
20" (508) Max. for 3" (76)
Unless Supported
G41UF VENTING IN EXISTING CHIMNEY
NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If ver
tical 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 terminate as illus
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
FIGURE 23
3" − 8"
(76mm−
203mm)
3" − 8"
(76mm−
203mm)
MINIMUM
12" (304mm)
ABOVE AVERAGE
SNOW ACCUMULATION
STRAIGHT−CUT OR
ANGLE−CUT IN DIRECTION
OF ROOF SLOPE
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
EXTERIOR
PORTION OF
CHIMNEY
INSULATE
TO FORM
SEAL
SHEET
METAL TOP
PLATE
MINIMUM 12"
(305mm) ABOVE
AVERAGE SNOW
ACCUMULATION
Condensate Piping
This unit is designed for either right or leftside exit of con
densate piping. Condensate drain line should be routed
only within the conditioned space to avoid freezing of con
densate and blockage of drain line. An electric heat cable
should be used where condensate line is exposed to un
conditioned areas.
1 − Determine which side condensate piping will exit the
unit. Remove temporary plugs from the condensate
collar on the appropriate side of the unit.
