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CONDENSATE DRAIN THROUGH VENT TERMINATION
DOWNWARD SLOPE ON HORIZONTAL VENT − RESIDENTIAL OR COMMERCIAL APPLICATION
EXHAUST VENT
TERMINATION
TEE
12 INCHES
(30.5cm)
MIN.
Category III adaptor must be
installed before optional elbow
(if used).
COMBUSTION
AIR INLET TEE
12 INCHES MIN. (30.5cm)
BETWEEN AIR INLET
AND EXHAUST
TERMINATION
(horizontal or vertical)
12 INCHES MIN.
(30.5cm) ABOVE
HIGHEST SNOWFALL
SLOPE = 1/4 IN. PER FOOT
RUN MAXIMUM.
GROUND LEVEL
LISTED WALL
THIMBLE THROUGH
COMBUSTIBLE WALL
NOTE − Minimum horizontal
vent length is 5 ft. This does not
include termination tee. Refer to
table 2 for maximum length and
number of elbows.
RESIDENTIAL APPLICATIONS −− Venting
must be listed special vent for Category III
appliances.
COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT HEATER.
FIGURE 5
Table 3 - Vertical Venting Requirements (FOA 45 - 125)
FOA
Vertical
Commercial
Applications
Model
Termination
Type
Flue
Inlet air
Approved Caps
Material
Size
Material
Size
Flue
Inlet air
-45
Two Pipe
Single wall
3"
Single
wall
3"
Any UL approved caps
Double Wall (B-1)
Concentric
Single wall
* 3"
Single
wall
* 3"
Concentric vent kit (4"/7")
Part # 65336800
Double Wall (B-1)
-60, -75
Two Pipe
Single wall
4"
Single
wall
4"
Any UL approved caps
Double Wall (B-1)
Concentric
Single wall
4"
Single
wall
4"
Concentric vent kit (4"/7")
Part # 65336800
Double Wall (B-1)
-100, -125
Two Pipe
Single wall
5"
Single
wall
4"
Any UL approved caps
Double Wall (B-1)
Concentric
Single wall
5"
Single
wall
**
4"
Concentric vent kit (5"/8")
Part # 65336900
Double Wall (B-1)
FOA
Vertical
Residential
Applications
Model
Termination
Type
Flue
Inlet air
Approved Caps
Material
Size
Material
Size
Flue
Inlet air
-45
Two Pipe
Double Wall (B-1)
3"
Single
wall
3"
Any UL approved caps
Concentric
Double Wall (B-1)
* 3"
Single
wall
* 3"
Concentric vent kit (4"/7")
Part # 65336800
-60, -75
Two Pipe
Double Wall (B-1)
4"
Single
wall
4"
Any UL approved caps
Concentric
Double Wall (B-1)
4"
Single
wall
4"
Concentric vent kit (4"/7")
Part # 65336800
-100, -125
Two Pipe
Double Wall (B-1)
5"
Single
wall
4"
Any UL approved caps
Concentric
Double Wall (B-1)
5"
Single
wall
**
4"
Concentric vent kit (5"/8")
Part # 65336900
* Field supplied 3" to 4" increaser required for connection to concentric adapter
** Field supplied 4" to 5" increaser required for connection to concentric adapter
Note: Vent cap
(for two pipe venting systems)
2 required per system
10