Fig. 27: Horizontal Thru-Wall Direct Venting/Combustion Air with Add-on

Condensing Heat Exchanger (Category IV)

 

Venting

Certified Venting

Vent Size

Maximum Vent

Combustion Air

Air Inlet

Max. Air

Model

Intake Pipe

Size

Intake Length

Category

Material

(inches)

Length (feet)

 

Material

(inches)

(feet)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UL 1738 Certified

 

35

Galvanized

 

35

ADB-751

IV

Venting Material e.g.

8

Subtract 10 ft per

Steel

6

Subtract 10 ft

w/CHX

AL29-4C Stainless

elbow, Max. 3

PVC, ABS

per elbow,

 

 

 

 

 

Steel PVC*, CPVC*

 

elbows

CPVC

 

Max. 3 elbows

 

 

 

 

 

 

 

 

 

 

UL 1738 Certified

 

35

Galvanized

 

35

ADB-1001

IV

Venting Material e.g.

10

Subtract 10 ft per

Steel

6

Subtract 10 ft

w/CHX

AL29-4C Stainless

elbow, Max. 3

PVC, ABS

per elbow,

 

 

 

 

 

Steel PVC*, CPVC*

 

elbows

CPVC

 

Max. 3 elbows

 

 

 

 

 

 

 

 

 

 

UL 1738 Certified

 

35

Galvanized

 

35

ADB-1501

IV

Venting Material e.g.

12

Subtract 10 ft per

Steel

8**

Subtract 10 ft

w/CHX

AL29-4C Stainless

elbow, Max. 3

PVC, ABS

per elbow,

 

 

 

 

 

Steel PVC*, CPVC*

 

elbows

CPVC

 

Max. 3 elbows

 

 

 

 

 

 

 

 

*Contact the manufacturer for details.

**If the boiler is direct vented, a 6 to 8 in. adapter must be installed at the blower inlet.

Table Q: Horizontal Thru-wall Direct Venting with Add-on

Condensing Heat Exchanger

37

Page 37
Image 37
Raypak 751 manual Pvc, Abs

751 specifications

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