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Dutchwest Natural Vent Gas Heater
30002008
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.
Fig. 7 Vent termination window.
Venting Requirements
Venting Runs
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.)
= Acceptable venting configuration
= Unacceptable venting configuration
NOTE: When venting staight vertical, without an
elbow, a minimum of 8 ft. vertical is required
off the top of the stove.
Horizontal Run (in feet)
Vertical Run (in feet)
(Measured from top of the unit before any elbow)
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
1 2 4 6 8 10 12 14 16 18 20 22 24
A
B
FP567b
Joists
Ceiling
Support
Trim
Collar
Air Space
Listed 4”
(102mm)
B-Vent
Decorative
6” Pipe
High-
Temperature
Silicone
Sealant
Air Space as
Required by
Code
ST361
Fig. 6 A ceiling pass-through, with decorative pipe around
the vent.
High-
Temperature
Silicone
Sealant