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Figure 21
Figure 22
REMOVE RIBS
FROM CAP
COMBUSTION
AIR
ROOF BOOT
(FIELD SUPPLIED)
VENT
BAYAIR30AVENTA (VERTICAL)
SEAL BETWEEN FLANGE, PIPE,
COUPLING AND METAL PANEL
WITH HI TEMP RTV SILICONE SEALANT
SUPPORT
FLANGE
GALVANIZED FIRESTOP SHOULD
BE FABRICATED WITH 3-7/8" DIA.
HOLE FOR SUPPORT FLANGE
(12" x 12" PANEL OR 12" DIA MIN.)
CLEARANCE ( 0" ACCEPTABLE FOR PVC VENT PIPE )
( 1" ACCEPTABLE FOR TYPE 29-4C STAINLESS STEEL VENT PIPE )
VENTING THROUGH CEILING
18-CD25D1-2
MAINTAIN 12 IN.
VENT
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF
SUPPORT
(FIELD SUPPLIED)
ELBOW
(FIELD SUPPLIED)
COMBUSTION
AIR
Figure 23
FLUE PIPE
COUPLING
CEILING
Installer's Guide
MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.
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 21 is the pre-
ferred 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 FITTING MATERIAL – STAINLESS STEEL
Gas and liquid tight single wall metal vent fitting, de-
signed for resistance to corrosive flue condensate such
as Type 29-4C MUST be used throughout.
These fittings and fitting accessories are to be field sup-
plied.
DIRECTION OF STAINLESS STEEL FITTING
All stainless steel fitting must be installed with male
end towards the Furnace.
All horizontal stainless steel sections must be posi-
tioned with the seam on top.
All long horizontal sections must be supported to pre-
vent sagging.
All pipe joints must be fastened and sealed to prevent
escape of combustion products into the building.
VENT
COMBUSTION
AIR
19
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