15
Material
Vent and
Intake Air Size
Vent Length
Combustion Air
Intake Pipe
Material
Intake Air Max.
Length
Min. Max.
Stainless Steel,
Polypropylene**
Galvanized
Steel, PVC,
ABS, CPVC
Table I. Category IV Vent Requirements
Size Approved Air Intakes
Approved Plastic
Terminals
Approved SS
Terminals
Table J. Horizontal Vent and Air Intake Terminals
Horizontal Through-the-Wall
Venting (Category IV)
Installation
CAUTION: This venting system requires the
installation of a condensate drain in the vent piping per
the vent manufacturer’s instructions. Failure to install
a condensate drain in the venting system will cause
damage which will not be covered under warranty.
vent the combustion products to the outdoors. Combustion
air is taken from inside the room and the vent is installed
horizontally through the wall to the outdoors. Adequate
combustion and ventilation air must be supplied to the
•
•
•
•
•
The vent cap is not considered in the overall length of the
venting system.
must be taken during assembly to ensure that all joints are
sealed properly and are airtight. The vent must be installed
to prevent the potential accumulation of condensate in the
vent pipes. It is recommended that the vent be insulated.
Insulation is required for installations in cold environments
The vent must be installed with a condensate drain
located in proximity to the heater as directed by the
vent manufacturer.
The vent must be installed with a slight upward slope
of horizontal run to the vent terminal.
VENT CAP
CONDENSATION
TRAP
HEATER UNIT
F10324
12" (30.5 cm)
MIN
Figure 8. Horizontal Through-the-Wall Venting
APPROVED
UNCONTROLLED DOCUMENT IF PRINTED
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