18-CD22D1-5
17
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 insulation 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 conform to national,
state, and local codes.
The vent & inlet terminals must be located at least 12" minimum above normally expected snow accumulation level.
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 20 or 21 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 building 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 recommended that a corrosion
resistant shield (24 inches square) be used behind the vent
VENT
COMBUSTION
AIR
VENT
VENT
PLATE
VENT
CAP
12" MINIMUM
TO OVERHANG
MAINTAIN 12" (18" FOR CANADA) MINIMUM
CLEARANCE ABOVE HIGHEST ANTICIPATED
SNOW LEVEL OR GRADE WHICHEVER IS GREATER
SCREWS
(4 req.)
ANCHORS
(4 req.)
7.2
"
3.2"
BAYVENT200B
p
terminal. This shield can be wood, plastic, sheet metal, etc.
Also, silicone caulk all cracks, seams and joints within 3 feet of
the vent terminal.
COMBUSTIBLE MATERIAL WALL
A minimum clearance of 1" to combustible materials must be
maintained when using single wall stainless steel venting. See
Figure 22.
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 outside 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 maintain
pitch of vent and properly seal.
Use cement mortar seal on inside and outside of wall.
See Figure 23.
VENTING THROUGH THE ROOF
When penetrating roof with a 2" PVC vent pipe, a 2" electrical
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 27 is the preferred method
for vertical vent termination in extremely cold climates.
In extreme climate conditions, insulate the exposed pipe
s
a
BAYAIR30AVENTA
(Sidewall)
