Vermont Casting 1920 Prefabricated Chimneys, Chimney Size, Chimney Connector Guidelines

Toward stove

Flue gas direction

Fig. 4 Chimney connector.

Masonry Chimneys, cont’d.

•Unused openings in an existing masonry chimney must be sealed with masonry to the thickness of the chimney wall, and the chimney liner should be repaired. Openings sealed with pie plates or wallpa- per are a hazard and should be sealed with mortar or refractory cement. In the event of a chimney fire, flames and smoke may be forced out of these unused thimbles.

•The chimney should be thoroughly cleaned before use.

•A newly-built masonry chimney must conform to the standards of local building code, or, in the absence of a local code, to a recognized national code. Ma- sonry chimneys must be lined, either with code-ap- proved masonry or precast refractory tiles, stainless steel pipe, or a code-approved, “poured-in-place” liner. The chimney clean-out door must seal tightly to ensure a good draft.

Prefabricated Chimneys

A prefabricated metal chimney must be one that is test- ed and listed for use with solid-fuel burning appliances to the High-Temperature (H.T.) Chimney Standard UL-103-1985 (2100°F.) for the United States, and High Temperature (650°C) Standard ULC S-629 for Canada.

Chimney Size

This stove is approved for venting into a masonry chim- ney with a nominal flue size of 8” x 8” (203 x 203 mm), and into a round flue size of 8” (203 mm) or 6” (152 mm).

It may be vented into larger chimneys as well. However, chimneys with liners larger than 8” x 12” (203 x 305 mm) may experience rapid cooling of smoke and reduction in draft, especially if they are located outside the home. Such large chimneys may need to be insulated or have the flue relined for proper stove performance.

Do not connect this unit to a chimney flue serv- ing another appliance.

NOTE: Do not vent this stove into a factory-built (zero-clearance) fireplace. This stove has not been tested and listed for that type of installa- tion. Factory-built fireplaces and their chimneys are specifically designed as a unit for use as fireplaces. It may void the listing or be hazard- ous to adapt them for any other use.

Do not connect the STOVE to any air distribu- tion duct or system.

Aspen Woodburning Stove

Ask your dealer about components available for con- necting the stove to a steel chimney liner.

Chimney Connector Guidelines

A chimney connector is the double-wall or single-wall pipe that connects the stove to the chimney. The chim- ney itself is a masonry or prefabricated structure that encloses the flue. Chimney connectors are used only to make the connection from the stove to the chimney. They are for interior use only.

Double-wall connectors must be tested and listed for use with solid-fuel burning appliances. Single-wall con- nectors should be made of 24 gauge or heavier steel, and should be 6” (152mm) in diameter. Do not use galvanized chimney connector; it cannot withstand the high temperatures that can be reached by smoke and exhaust gases, and may release toxic fumes under high heat.

If possible, do not pass the chimney connector through a combus- tible wall or ceiling. If

passage through a combustible wall is

unavoidable, refer to the recommendations in the section follow- ing on Wall Pass- throughs. Do not pass the connector through an attic, a closet or any similar concealed

space. The whole chimney connector should be ex- posed and accessible for inspection and cleaning.

Install the single wall chimney connector not less than 18” (457mm) from the ceiling. Keep it as short and direct as possible, with no more than two 90 degree turns. If possible, use 45° elbows. Slope horizontal runs of connectors upward 1/4” per foot (20mm per meter) going from the stove toward the chimney. The recommended maximum length of a horizontal run is 3’ (914mm), and the total length of chimney connector should be no longer than 8’ (2.5 meters).

In cathedral ceiling installations, extend the prefabri- cated chimney downward to within 8 feet (2.4m) of the stove.

SAFETY NOTE: Always wear gloves and protective eyewear when drilling, cutting or joining chimney connector sections .

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