2 18-CH34D1-8B-EN
Installer’s Guide
THIS VENT KIT IS ONLY TO BE USED FOR VENTING
CATEGORY IV FURNACES. DO NOT USE TO VENT
CATEGORY I, II OR III VENT FURNACES. FAILURE TO
FOLLOW THIS WARNING COULD RESULT IN FIRE,
PERSONAL INJURY OR DEATH.
DISCONNECT POWER SUPPLY BEFORE BEGINNING
INSTALLATION TO PREVENT PERSONAL INJURY OR
DEATH FROM ELECTRICAL SHOCK AND EQUIPMENT
DAMAGE.
INSTALLATION - ROOF TERMINATION (SEE FIG. 3)
NOTE: Ensure termination height is 12 inches above
the roof surface or anticipated snow level as shown
in Figure 4.
NOTE: Do not allow insulation or other materials to
accumulate inside pipe assembly when installing through
hole.
NOTE: Instead of cementing the smaller pipe to the rain
cap, RTV silicon sealant may be used to permit future
eld disassembly for cleaning.
NOTE: If assembly is too short to meet the height
requirement, the two pipes supplied in the kit may
be replaced by using same diameter, eld supplied
SDR-21, SDR-26, or SCH 40 PVC pipe. Do not extend
the 4" pipe (24" as shipped) to more than 60 in. (See
Figure 2).
DO NOT USE FIELD SUPPLIED COUPLINGS TO EXTEND
MAIN BODY PIPES (4" AND 2-1/2" PIPES). AIRFLOW
RESTRICTION WILL OCCUR AND THE FURNACE
PRESSURE SWITCH MAY CAUSE INTERMITTENT
OPERATION.
CAUTION
FAILURE TO REMOVE RIBS FROM RAIN CAP FOR
VERTICAL 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.
CONCENTRIC VENT KIT ASSEMBLED
4.5" DIA
35.2" (typ.)
3" DIA VENT/
EXHAUST
3" DIA INTAKE/
COMBUSTION AIR
MAY BE
LENGTHENED TO 60" MAXIMUM
WITH FIELD REPLACEMENT PIPING.
DO NOT EXTEND MAIN BODY PIPES
WITH PIPE COUPLINGS.
MAIN BODY PIPES
21.125" (typ)
MAINTAIN 12 IN.
MINIMUM
CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.
VENT
COMBUSTION
AIR
REMOVE RIBS
FROM CAP
CONCENTRIC VENT
3
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