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 mois- ture, it is recommended that a corrosion resistant shield (24 inches square) be used behind the vent termi- nal. 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 31.
;
12" MIN TO OVERHANG
1" 
1 2"
Installer’s Guide
z
x
COMBUSTION
AIR 
BAYAIR30AVENTA
(Sidewall)
VENT
MAINTAIN 12 IN (18 IN. FOR CANADA) MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE WHICHEVER IS GREATER
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 maintain pitch of vent and properly seal.
Use cement mortar seal on inside and outside of wall. See Figure 32.
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 36 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.
cSUPPORT HORIZONTAL PIPE EVERY 3' 0" WITH THE FIRST SUPPORT AS CLOSE TO THE FURNACE AS POSSIBLE. INDUCED DRAFT BLOWER, HOUSING, AND FURNACE MUST NOT SUPPORT THE WEIGHT OF THE FLUE PIPE.
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