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43
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’
Note: When vertical height exceeds 25 ft, consult
factory prior to installation.
Fig. 40: Direct Vent - Vertical
Table S: Category II or IV Vertical Venting
* Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further details.
When vertical height exceeds 25 ft, consult factory prior to installation.
** Subtract 10 ft per elbow. Max. 3 elbows.
Maximum combustion air duct length terminated at 100 equivalent ft.
*Requires optional vent tee for rear discharge.