Vermont Casting 1920 U.S. Requirements, Canadian Requirements, Aspen Woodburning Stove

Aspen Woodburning Stove

U.S. Requirements:

The National Fire Protection Association (NFPA) has established guidelines for use in the United States for passing chimney connectors through combustible walls. Many building code inspectors follow these guidelines.

Figure 9 shows one NFPA-approved method. All com- bustible material in the wall is cut away to provide 12” (305 mm) clearance to the connector. Brick and mortar are used to enclose the clearance area.

Solid insulated, listed factory- built chimney length set flush

with flue

Min. 9” 230mm

Masonry

Chimney constructed to NFPA 211

	Min. 2”
	(51mm)
	Min. 9”
	(230mm)
Flue	Chimney
	Connector
Chimney
	Air Space

Alternate methods approved by the NFPA:

•Using a section of double-wall chimney with a 9” (229 mm) clearance to combustibles. (Fig. 10)

•Placing a chimney connector pipe inside a steel double-wall ventilated thimble, which is then sepa- rated from combustibles by 6” (152 mm) of fiberglass insulating material. (Fig. 11)

•Placing a chimney connector pipe inside a section of 9” (229 mm) diameter, solid-insulated, factory-built chimney, with two inches of air space between the chimney section and combustibles. (Fig. 12)

Canadian Requirements:

In Canada, the Canadian Standards Association has established specific guidelines regarding wall pass- though design. Figure 13 shows one approved method in which all combustible material in the wall is cut away to provide the required 18” (457 mm) clearance around the connector. The resulting space must remain empty. A flush-mounted sheet metal cover may be used on one side only. If covers must be used on both sides, each cover must be mounted on noncombustible spacers at least 1” (25 mm) clear of the wall. Your local dealer or your local building inspector can provide details of other approved methods of passing a chimney connector through a combustible wall.

In Canada, this type of installation must conform to CAN/CSA-B365, Installation Code for Solid Fuel Burn- ing Appliances and Equipment.

		Non-soluble re-	24 ga.Sheet
	Sheet Steel		Steel Sup-
		fractory cement	ports
ST273	Supports

Fig. 10 Wall Pass-through using factory-built insulated chimney section.

Chimney clearance to sheet		steel
supports and combustibles		2” (51mm) Min.
Steel Thimble
with two 1”
(25mm) Ventilated		Min. 6”
Channels		(152mm)
	Flue	Chimney Connector
	Chimney	Glass Fiber
Masonry Chimney construct-		Insulation
ed to NFPA 211
		24 ga.Sheet
		Steel Supports

ST274

Fig. 11 Wall Pass-through using single wall chimney connector with a ventilated steel thimble.

Chimney clearance to sheet steel	2” (51mm)
supports and combustibles	Min.

2” (51mm) Min.
air space		2” (51mm) Min.
	Flue
		Chimney Con-
	Chimney	nector
Prefab Chim-		Prefab
ney
		Chimney
Section
		Section
24 ga. Sheet		24 ga. Sheet
Steel Supports		Steel Supports
ST275		Masonry Chimney construct-
		ed to NFPA 211

Fire clay liner

Min. 2” (51mm) Chimney clear- ance to brick and combustibles

Fig. 12 Wall Pass-through with ventilated steel thimble.

A

A

Masonry		Min. 12”
Chimney	Flue	(305 mm)
constructed
to NFPA 211	Chimney	Chimney
		connector
		Fire clay
		liner

A = Minimum 12” (305 mm) brick con- struction between liner and combustible

framing materials ST272

Min. 18” (460mm)

Chimney clearance to sheet steel	2” (51mm)
supports and combustibles		Min.

	Min. 18”
Flue	(460mm)
Chimney	Chimney
	Connector
	24 ga.Sheet
	Steel Support

24 ga. Sheet Steel Support

Fig. 9 Masonry Wall Pass-through with single wall chimney connector.

ST276

(one side only)Masonry Chimney constructed to CAN/CSA-B365

Fig. 13 CSA approved Wall Pass-through.

8 30000369