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Model
No.
Appliance
Category
Certified
Venting
Material
Vent
Size
(inches)
Min./Max. Vertical
Venting Height (feet)
Combustion
Air Intake
Pipe
Material
Air Inlet
Size
(inches)
Max. Air
Intake
Length
(feet)
Min. Max.
HD101
HD151
I
Type B
Equivalent
4 6
25*
Galvanized
Steel
PVC
ABS
CPVC
4 100
HD201
HD251
HD301
5
(HD201) 6
(HD251) 6
(HD301) 11
HD401 6 8
Table M: Vertical Venting
Fig. 21: Direct Vent—Vertical Venting (Category I)
*Over 25 feet, use single acting barometric damper. Consult the factory for additional information.