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Horizontal Through-the-Wall Venting
(Category IV)
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Fig. 39: Horizontal Through-the-Wall Venting
(Category IV)
Installation
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Air Inlet
Max. Length*
Model
Certified
Venting
Material
Vent Size
Maximum
Equivalent
Vent Length
Combustion Air
Intake Pipe
Material
6” 8”
302BE 5”
402BE
100’ N/A
502BE
6”
75’
652BE
752BE
40’
100’
902BE
Category II
or IV
8”
70’
Room Air
40’
Ducted
Combustion
Air
Galvanized Steel,
PVC,
ABS,
CPVC
30’ 80’
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Common Venting System
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Table U: Category II and IV Venting
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