Raypak HI DELTA 122-322 Installation & Operating Instructions Manual page 29

INTAKE
VENT
COMBUSTION AIR
FILTER
BOILER
UNIT
Model Appliance
No. Category
122
162
202 III
242
322
VENT PIPE
Fig. 20: Direct Vent Horizontal Thru-Wall Venting (Category III)
Certified
Vent Size
Venting
(inches)
Material
4
Stainless
Steel 5
(Gas Tight)
6
Table L: Horizontal Thru-Wall Venting
12"
6"
Max. Combustion
Venting Air Intake
Length Pipe
(feet) Material
40
Galvanized
Subtract 10
Steel
ft per
PVC
elbow,
ABS
Max. two
CPVC
elbows
29
VENT CAP
36" MIN.
INTAKE
VENT
12" MIN.
Max. Air
Air Inlet
Intake
Size
Length
(inches)
(feet)
40
Subtract 10
ft per
5
elbow,
Max. two
elbows