Extended Concentric Vent Installation Instructions
CVENT-2-EXT Extended Concentric Vent Termination
For use with all condensing gas furnace models
General
The Extended Concentric Vent allows both the intake for combustion air and the exhaust vent to pass through a standard roof or
sidewall. This is an alternative to the standard two pipe intake/vent shown in the basic furnace installation instructions.
Follow these instructions as well as the basic furnace installation instruction for installation of the intake/vent pipe(s) and all
furnace installation procedures.
Refer to the furnace installation instructions for intake/vent pipe sizing information.
NOTE: The Extended Concentric Vent reduces the allowable intake/vent piping length by 5 feet from that listed in the basic furnace
installation instructions.
Do not operate the furnace until the installation and assembly
of the Extended Concentric Vent and all piping are completed.
Failure to follow this warning could result in product damage
or improper operation, personal injury or death.
WARNING:
This kit contains the following parts:
(1) Combustion Air Inlet Cap
(1) Air Inlet Pipe
(1) Vent Pipe
(1) Intake/Vent Concentric “Y”
Pipe and ttings are required to complete installation (user supplied). The combustion air and vent pipe ttings must conform to
ANSI and ASTM standards D1785, F891, D2665, D2241, D2661, or F628. Pipe cement and primer must conform to ASTM standards
D2564 or D2235.
In Canada, construct all combustion air and vent pipes for this unit of CSA or ULC certied Schedule 40 PVC, PVC-DWV, or ABS-DWV
pipe and pipe cement.
MODEL INTAKE/VENT NOM.
PIPE SIZE
OVERALL ASSEM’D
LENGTH
1
INTAKE PIPE OUTSIDE
DIAMETER
AIR INLET PIPE
LENGTH
2
CVENT-2-EXT 2” 60” 3-1/2” 45-3/4”
1. Shipping dimension. This may be eld modied by cutting or extending both the intake and exhaust pipes. 12” is the
minimum allowable length and 60” is the maximum allowable length for this dimension. SDR-26 PVC (D2241) only may be
used for extending pipes. Do not extend pipes with Schedule 40 PVC or couplings.
2. This dimension will change if the intake/vent pipes are lengthened or shortened.
Figure 1–Vent Terminal Assembly
Assembled Terminal
“Y” Concentric Fitting
3” diameter
air inlet pipe
2” diameter
vent pipe
Combustion
air inlet cap
Figure 2–Typical Roof Installation
Vent
Combustion Air
Maintain 12”
minimum (18” for
Canada) clearance
above highest anticipated
snow level. maximum of 24”
above roof.
Some local code inspectors are not familiar with
concentric vents. Be sure to check local code
requirements and acceptability prior to installation.
NOTICE:
Do not use the Extended Concentric Vent kit for anything
other than a Category IV furnace. One Extended Concentric
Vent Kit can be used for each furnace. Failure to follow this
warning could result in re, personal injury or death.
WARNING:
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