Dutchwest Natural Vent Gas Heater

Passing Through a

Combustible Wall or Ceiling

An approved pass-through device is always required when a vent passes through a combustible wall or ceiling. Check with the maker of the vent system for the correct listed devices that are available. A listed pass-through device is required whether or not the installation includes decorative pipe around the Type B venting system. NOTE: It is essential to seal between the ceiling support (sometimes called a ‘firestop spacer’) and the decorative pipe, if installed, with a high-temperature silicone sealant. (Fig. 6)

Complete the venting system installation according to the manufacturer’s instructions.

Venting Requirements

 

 

36

 

 

elbow)

34

A

 

32

 

B

 

30

 

any

 

 

 

28

 

 

before

 

feet)

26

 

24

 

 

 

(in

unit

22

 

20

 

Vertical Run

from top of the

 

18

 

16

 

14

 

12

 

10

 

 

 

 

Air Space as

Required by

Code

High-

Temperature

Silicone

Sealant

Decorative

6” Pipe

Listed 4” (102mm)

ST361 B-Vent

Joists

Ceiling

Support

Trim

Collar

High-

Temperature

Silicone

Sealant

Air Space

(Measured

8

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

4

6

8

10

12 14 16 18

20 22

24

Horizontal Run (in feet)

Venting Runs

NOTE: When venting staight vertical, without an elbow, a minimum of 8 ft. vertical is required off the top of the stove.

= Acceptable venting configuration

= Unacceptable venting configuration

Fig. 6 A ceiling pass-through, with decorative pipe around the vent.

A:Vertical installations up to 36 feet (12m) in height. Up to an 18 ft. horizontal vent run can be installed within the vent system using a maximum of two 90-degree elbows or four 45-degree elbows.

B:Vertical installations up to 36 feet (12m) in height. Up to a 24 ft. horizontal vent run can be installed within the vent system using a maximum of two 45-degree elbows.

(Ratio = 2/3, Hor./Vert.)

FP567b

Fig. 7 Vent termination window.

30002008

7

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CFM Corporation 2467, 2468 manual Passing Through a Combustible Wall or Ceiling, Venting Requirements

2468, 2467, 2468 specifications

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