Raypak HD401 Installation & Operating Instructions Manual page 30

Model Appliance
No. Category
HD101
HD151
HD201
I
Equivalent
HD251
HD301
HD401
*Over 25 feet, use single acting barometric damper. Consult the factory for additional information.
Maximum 4 elbows, for either intake or vent.
Fig. 23: Direct Vent—Vertical Venting (Category I)
Certified Vent
Venting Size
Material (inches)
4
Type B
5
6
Table N: Vertical Venting
Min./Max. Vertical
Venting Height (feet)
Min. Max.
6
(HD201) 6
25*
(HD251) 6
(HD301) 11
8
30
Combustion
Air Inlet
Air Intake
Size
Pipe
(inches)
Material
Galvanized
Steel
PVC 4
ABS
CPVC
Max. Air
Intake
Length
(feet)
100