20
18-CD33D1-4
Installer’s Guide
▲
CAUTION
!
When the vent pipe is exposed to temperatures below
freezing, i.e., when it passes through unheated spaces,
etc., the pipe must be insulated with 1/2 inch (22.7 mm)
thick Armaflex-type insulation or equal. If the space
is heated sufficiently to prevent freezing, then the in-
sulation would not be required. If domestic water pipes
are not protected from freezing then it is assumed the
space meets the condition of a heated space.
HORIZONTAL VENTING THROUGH WALL
These furnaces may be installed as direct vent (as
shipped) or as nondirect vent. Installation must con-
form to national, state, and local codes.
The vent & inlet terminals must be located at least 12"
minimum above normally expected snow accumulation
level (18" minimum in Canadian applications).
Avoid areas where staining or condensate drippage may
be a problem.
Location of the vent/ wind terminal should be chosen to
meet the requirements of Figure 24 for either direct or
non-direct vent applications.
PITCH –
Venting through the wall must maintain 1/4"
per foot pitched upward to insure that condensate drains
back to the furnace.
FLUE GAS DEGRADATION –
The moisture content of
the flue gas may have a detrimental effect on some build-
ing materials. This can be avoided by using the roof or
chimney venting option. When wall venting is used on
any surface that can be affected by this moisture, it is rec-
ommended that a corrosion resistant shield (24 inches
square) be used behind the vent terminal. This shield can
be wood, plastic, sheet metal, etc. Also, silicone caulk all
cracks, seams and joints within 3 feet of the vent termi-
nal.
COMBUSTIBLE MATERIAL WALL
A minimum clearance of 1" to combustible materials must
be maintained when using single wall stainless steel
venting. See Figure 28.
Shield material to be a minimum of 24 gauge stainless
or aluminized sheet metal. Minimum dimensions are
12"x12". Shield must be fastened to both inside and out-
side of wall. Use screws or anchor type fasteners suited
to the outside or inside wall surfaces.
NONCOMBUSTIBLE MATERIAL WALL
The hole through the wall must be large enough to main-
tain pitch of vent and properly seal.
Use cement mortar seal on inside and outside of wall.
See Figure 29.
VENTING THROUGH THE ROOF
When penetrating roof with a 2" PVC vent pipe, a 2" elec-
trical conduit flashing may be used for a weather tight
seal. Lubricate flexible seal on flashing before PVC pipe
is pushed through the seal. (Field Supplied)
NOTE:
No vent cap as shown in Figure 33 is the preferred
method for vertical vent termination in extremely cold
climates.
In extreme climate conditions, insulate the exposed
pipe above the roof line with Armaflex type insulation.
VENT
COMBUSTION
AIR
VENT
VENT
PLATE
VENT
CAP
12" MINIMUM
TO OVERHANG
MAINTAIN 12" MINIMUM CLEARANCE
ABOVE HIGHEST ANTICIPATED SNOW
LEVEL OR GRADE WHICHEVER IS GREATER
SCREWS
(4 req.)
ANCHORS
(4 req.)
7.2"
3.2"
BAYVENT200B
h
j
BAYAIR30AVENTA
(Sidewall)
COUPLING
(PLASTIC
VENTING)
STUD
PVC WALL
MOUNT FLANGE
(OPTIONAL)
APPROVED
TERMINATION
1” CLEARANCE
(AIR SPACE)
VENTING THROUGH COMBUSTIBLE WALLS
Pitch - 1/4 Inch Per Foot
CLEARANCE (0” ACCEPTABLE FOR PVC VENT PIPE)
(1” ACCEPTABLE FOR TYPE 29-4C STAINLESS STEEL VENT PIPE)
12” MINIMUM ABOVE
NORMALLY EXPECTED
SNOW ACCUMULATION
LEVEL
6 IN. MIN.
(TO JOINT)
k
For Canadian applications only, IPEX 196006, IPEX 081216, IPEX
081218, and IPEX 081219 may be used for horizontal vent terminations.
For Canadian applications only, IPEX 196006, IPEX 081216, IPEX
081218, and IPEX 081219 may be used for horizontal vent terminations.
