Vermont Casting 2310 Wall Pass-Throughs, Chimney Connectors, Vermont Castings Vigilant, 2000898

Vermont Castings Vigilant

An unprotected mantel must have a minimum clear- ance of 36”, measured from the stove’s top plate; with a ventilated shield the clearance may safely be reduced to 18”.

Unprotected top trim must be a minimum of 36” from the stove’s top surface; with a ventilated trim shield the clearance may be safely reduced to 18”.

Unprotected side trim which protrudes 2” or more from the face of the fireplace must have a minimum 36” of clearance, measured from the stove’s top side edge; with a ventilated trim shield, the clearance may be safely reduced to 18”.

Unprotected side trim which protrudes less than 2” from the fireplace face must have a minimum clearance of 18”; with a ventilated trim shield, this may be safely

reduced to 12”. (Fig. 15)

	A	B
	C		C
			ST691
	Unprotected		Protected
A. Mantel....	36” (910mm)		18” (460mm)
B. Top Trim.	36” (910mm)		18” (460mm)
C. Side Trim
....... Over 2”	36” (910mm)		18” (460mm)
..... Under 2”	18” (460mm)		12” (300mm)

Fig. 15 Maintain clearances to combustible mantel compo- nents.

Wall Pass-Throughs

Whenever possible, design your installation so that the chimney connector does not pass through a combus- tible wall. If you are considering a wall-pass through in your installation, be sure you check with your building inspector before you begin. Also check with the chim- ney connector manufacturer for any specific require- ments.

Accessories are available on the market which have been tested and listed specifically for use as wall pass- throughs. Use only these tested and listed accessories for wall pass-throughs.

The National Fire Protection Association (NFPA) has established guidelines for passing chimney connectors through combustible walls. Many building code inspec- tors follow these guidelines when approving installa- tions.

The illustration below shows one NFPA recommended method, in which all combustible material in the wall is cut away from the single wall connector a sufficient distance to provide the required 12” clearance for the connector. Any material used to close up the opening must be noncombustible.

Wall Stud

Chimney Con- nector

T

DEFIAN

12” Noncombustible Naterial

Floor Pro- tection

ST493

Fig. 16 An approved wall pass-through method.

Three other methods are also approved by the NFPA.

•Using a section of double-wall chimney with a nine- inch clearance to combustibles

•Placing a chimney connector pipe inside a ventilated thimble, which is then separated from combustibles by six inches of fiberglass insulating material

•Placing a chimney connector pipe inside a section of eight-inch diameter solid insulated factory-built chim- ney, with two inches of airspace between the chimney

section and combustibles.

Chimney Connectors

The chimney connector should be made of 24 gauge or heavier sheetmetal. Galvanized chimney connector should not be used, as it may release toxic fumes when exposed to high temperatures.

The chimney connector should be as short and direct as possible, with no more than two 90 degree turns.

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