Raypak HI DELTA 122-322 Installation & Operating Instructions Manual page 31

Model Appliance
No. Category
122
162
202 I
242
322
12" MIN.
INTAKE
VENT
COMBUSTION
AIR FILTER
BOILER
UNIT
Fig. 21: Direct Vent—Vertical Venting (Category I)
Certified
Vent Size
Venting
(inches)
Material
4
Type B
5
Equivalent
6
Table M: Vertical Venting
36"
VENT CAP
Min./Max.
Combustion
Vertical
Air Intake
Venting
Pipe
Height
Material
(feet)
Galvanized
Steel
5/25
CPVC
31
36" MIN.
VENT PIPE
Air Inlet
Size
(inches)
PVC 5
ABS
Max. Air
Intake
Length
(feet)
40
Subtract 10
ft per
elbow,
Max. two
elbows