Lennox MERIT ML195UH Installation Instructions Manual page 29

2" EXTENSION FOR 2" PVC
PIPE1" EXTENSION FOR 3"
PVC PIPE
4''
FURNACE
INTAKE
PIPE
FLUSH-MOUNT SIDE WALL TERMINATION KIT
51W11 (US) or 51W12 (Canada)
FIGURE 37
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 38
FIELD-PROVIDED
QUIRED TO ADAPT
LARGER VENT PIPE
SIZE TO TERMINATION.
OUTSIDE
WALL
EXHAUST
AIR
INTAKE
CLAMP
AIR
(Not Furnished)
DIRECT VENT CONCENTRIC WALL TERMINATION
71M80, 69M29 or 60L46 (US)
41W92 or 41W93 (Canada)
FIGURE 39
FURNACE
EXHAUST
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
FLASHING
INTAKE
(Not Furnished)
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
INTAKE
AIR
EXHAUST
AIR
12" (305mm) Min.
INTAKE
above grade or
AIR
cumulation.
GRADE
EXHAUST
VENT
INTAKE
AIR
Inches (mm)
optional intake elbow
OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT
INSTALLATION OF DIRECT VENT WALL TERMINATION KIT
DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
NOTE - Do
tical discharge through an existing unused chimney or stack is required, insert piping
inside
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
Details of Exhaust Piping Terminations for Non-Direct
Vent Applications
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 42 through 43 show typical termina-
tions.
1 - Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed
in table 8.The specified pipe size ensures proper
velocity required to move the exhaust gases away
from the building.
Page 29
(305mm)
5-1/2"
5"
(140mm)
(127mm)
18" MAX.
(457mm)
EXHAUST VENT
12" (305mm) Min.
above grade or
INTAKE
AIR
Side View
(30G28 or 81J20)
FIGURE 40
ANGLE-CUT IN DIRECTION
3" - 8"
(76mm-
8" - 12"
203mm)
(203mm - 305mm)
SHOULDER OF FITTINGS
INTAKE PIPE
INSULATION (optional)
OF PIPE ON TOP PLATE
SHEET
METAL TOP
PLATE
INSULATE
TO FORM
SEAL
FIGURE 41
12"
Front View
cumulation.
STRAIGHT-CUT OR
OF ROOF SLOPE *
PROVIDE SUPPORT
ALTERNATE
INTAKE PIPE
3" - 8"
(76mm-
203mm)
EXTERIOR
PORTION OF
CHIMNEY