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Raypak HI DELTA 122-322 User Manual

Page 29

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29

Fig. 20: Direct Vent Horizontal Thru-Wall Venting (Category III)

12"

36" MIN.

12" MIN.

6"

VENT CAP

VENT PIPE

COMBUSTION AIR
FILTER

BOILER
UNIT

INTAKE
VENT

INTAKE
VENT

Model

No.

Appliance

Category

Certified

Venting

Material

Vent Size

(inches)

Max.

Venting

Length

(feet)

Combustion

Air Intake

Pipe

Material

Air Inlet

Size

(inches)

Max. Air

Intake

Length

(feet)

122

III

Stainless

Steel

(Gas Tight)

4

40

Subtract 10

ft per

elbow,

Max. two

elbows

Galvanized

Steel

PVC

ABS

CPVC

5

40

Subtract 10

ft per

elbow,

Max. two

elbows

162
202
242

5

322

6

Table L: Horizontal Thru-Wall Venting