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INSTALLER'S GUIDE
2
3" DIA PVC INTAKE/
COMBUSTION AIR
3" DIA PVC
MAIN BODY PIPES
VENT/EXHAUST
LENGTHENED TO 60" MAXIMUM
WITH FIELD REPLACEMENT PIPING.
DO NOT EXTEND MAIN BODY PIPES
WITH PIPE COUPLINGS.
CONCENTRIC VENT KIT ASSEMBLED
INSTALLATION - ROOF TERMINATION (SEE FIG. 3)
1.
Determine best location for termination kit.
2.
Cut one hole (5 in. diameter) for vent kit.
NOTE: Ensure termination height is above the roof surface
or anticipated snow level (1 ft. in USA or 1 1/2 ft. in Canada)
as shown in Figure 4.
NOTE: If assembly is too short to meet the height require-
ment, the two pipes supplied in the kit may be replaced by
using same diameter, field supplied SDR-26 PVC (ASTM
D2241) pipe. Do not extend the 4" pipe (24" as shipped) to
more than 60 in. (See Figure 2).
CAUTION
L
!
DO NOT USE FIELD SUPPLIED COUPLINGS TO EXTEND
MAIN BODY PIPES (4" AND 2-1/2" PIPES). AIRFLOW RE-
STRICTION WILL OCCUR AND THE FURNACE OR BOILER
PRESSURE SWITCH MAY CAUSE INTERMITTENT OPERA-
TION.
3.
Partially assemble the vent kit. Clean the pipe ends and
adjoining sockets with PVC primer (ASTM F-656) and
cement using PVC cement (ASTM D-256).
a. Cement the Wye concentric fitting to larger diameter kit
pipe. (See Figure 1)
b. Cement the rain cap to smaller diameter kit pipe. (See
Figure 1)
NOTE: Instead of cementing the smaller pipe to the rain cap,
RTV silicon sealant may be used to permit future field disas-
sembly for cleaning
4. Install Wye fitting and pipe assembly from the inside through
structure's hole. Install field supplied roof boot/ flashing.
NOTE: Do not allow insulation or other materials to accumu-
late inside pipe assembly when installing through hole.
5. Secure assembly to roof structure as shown in Figure 4 using
field supplied metal strapping or equivalent support material.
Page 2
4.5" DIA
21.125" (typ)
35.2" (typ.)
MAY BE
3
REMOVE RIBS
FROM CAP
MAINTAIN 12 IN.
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.
CONCENTRIC VENT
ROOF TOP APPLICATION
6. Remove ribs from rain cap. Install the rain cap and the
small diameter pipe assembly in the Wye fitting and pipe
assembly. Ensure that the small diameter pipe is cemented
and bottomed into the Wye fitting.
WARNING
L
!
FAILURE TO REMOVE RIBS FROM RAIN CAP FOR VERTI-
CAL VENT KIT INSTALLATIONS MAY CAUSE ICE OR SNOW
TO FORM ON THE RAIN CAP, LEADING TO AN INOPERABLE
FURNACE. FAILURE TO FOLLOW THIS WARNING COULD
RESULT IN PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.
NOTE: Kit supplied stainless steel screw will be used to se-
cure the rain cap to the pipe.
WARNING
L
!
DRILL A PILOT HOLE IN THE VENT PIPE FOR THE SCREW
SIZE BEING USED. FAILURE TO DRILL ADEQUATE HOLES
MAY CAUSE CRACKING OF THE PVC COMPONENTS, AL-
LOWING FLUE GASES TO BE RECIRCULATED. FAILURE TO
FOLLOW THIS WARNING COULD RESULT IN PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
7. Cement the furnace or boiler combustion air and vent pipes
to the concentric vent termination assembly. See Figure 4
for proper pipe attachment.
8. CHECKOUT: Operate the furnace or boiler to make sure ALL
pipe joints are fastened and sealed to prevent the escape of
combustion products into the building.
NOTE: Two or more installations require a minimum separa-
tion distance of approximately one inch between vent kits.
WARNING
L
!
DO NOT OPERATE THE FURNACE OR BOILER WITHOUT
THE RAIN CAP IN PLACE AS RECIRCULATION OF COMBUS-
TION PRODUCTS MAY OCCUR. WATER MAY ALSO COLLECT
INSIDE THE LARGER COMBUSTION AIR PIPE AND FLOW
TO THE BURNER ENCLOSURE. FAILURE TO FOLLOW THIS
WARNING COULD RESULT IN PRODUCT DAMAGE OR IM-
PROPER OPERATION, PERSONAL INJURY OR DEATH
VENT
COMBUSTION
AIR
Pub. No. 18-CH34D1-7
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