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Direct Vent - Vertical
Vertical Venting
Height*
Air Inlet
Max. Length**
Model
Certified
Venting
Material
Vent Size
Min. Max.
Combustion Air
Intake Pipe
Material
6” 8”
302B 5”
402B
100’ N/A
502B
6”
75’
652B
752B
902B
Category II
or IV
8”
5’ 25’
Galvanized Steel,
PVC,
ABS,
CPVC
40’
100’
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Fig. 41: Direct Vent - Vertical
Table V: Category II or IV Vertical Venting
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