Vermont Casting 2468, 2467 Passing Through a Combustible Wall or Ceiling, Venting Requirements

Passing Through a

Combustible Wall or Ceiling

An approved pass-through device is always required when a vent passes through a combustible wall or ceil- ing. 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 installa- tion includes decorative pipe around the Type B venting system. NOTE: It is essential to seal between the ceil- ing 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.

Air Space as Re-	Joists
quired by Code
	Ceiling
	Support
High-Tempera-
ture Silicone	Trim Col-
Sealant
	lar
Decorative	High-Tem-
	perature
6” Pipe
	Silicone
	Sealant

Listed 4”

(102mm)Air Space

ST361 B-Vent

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

Dutchwest Natural Vent Gas Heater

Venting Requirements

	elbow)	36
		34			A
		32				B
		30
	any
		28
feet) before
		26
		24
(in unit		22
		20
Vertical Run	from top of the
		18
		16
		14
		12
		10
	(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

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.

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