Canada

When the insert is installed in a factory-built ﬁre- place:

•The factory-built chimney must meet type HT requirements of UL 103, ULC S629M or UL 127- 1988, or be re-lined from the insert to the chimney top.

General Considerations / U.S.

•While not required in most jurisdictions in the U.S., CFM Corporation strongly recommends a full stainless steel chimney liner be installed for the insert to the chimney top to increase overall performance and reduce yearly maintenance.

•A masonry chimney must be well-constructed and must meet minimum code requirements. The chimney ﬂue should have a code-approved liner made of masonry or pre-cast refractory tiles, straight or ﬂexible stainless steel pipe, or a poured-in-place liner. An unlined chimney must be relined professionally.

•The chimney must have a nominal ﬂue size of 6” (152 mm) diameter, but no greater than 3 times larger. A chimney larger than this must be re- lined.

Be aware that a chimney originally designed for ﬁre- place use may perform differently when used to vent an air-controlled appliance such as your WinterWarm Small Insert - even if the ﬂue is less than 3 times larger than the ﬂue collar. For example, a chimney on an outside wall may not heat up enough to sustain an adequate draft. Such a ﬂue can often be improved if it is relined to reduce its size and/or insulated to keep it warmer.

•A positive ﬂue connection must be made be- tween the Insert and the ﬁrst masonry tile or prefabricated metal chimney section. A positive ﬂue connection consists of a plate that seals or replaces the ﬁreplace damper and a section of chimney connector that passes through the plate into the chimney. The chimney connector must be a minimum equivalent to a 6” (152 mm) diameter opening and must be 24 gauge or heavier stain- less steel.

Chimney Connection systems are available from a variety of manufacturers. Your Vermont Castings dealer can recommend a system that will best meet the re- quirements of your particular installation.

Sealing Requirements / U.S.

•The chimney must be sealed off from room air, either by a plate at the damper level or by sealing the ﬁreplace opening.

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WinterWarm Small Insert

•Unused openings to the ﬂue must be sealed with masonry to the thickness of the chimney wall. Openings sealed with pie plates or wallpaper are a hazard. In the event of a chimney ﬁre, ﬂames and smoke may be forced from the openings.

In Canada (CAN/CSA-B365-M91, Section 5), wheth- er installed in a masonry or factory built ﬁreplace:

•A full chimney liner meeting ULC S635, Class III (stainless steel) must be installed from the insert to the chimney top, and securely attached to both. The damper may be removed to accommo- date the liner.

•The opening of the ﬁreplace around the insert must be sealed to prevent room air passing to the ﬁreplace cavity.

•Existing air-circulation chambers in a ﬁreplace with a steel liner may not be blocked.

•Provision must be made for removal of the insert to clean the chimney ﬂue.

•A permanent metal warning label must be afﬁxed to the back of the ﬁreplace stating the ﬁreplace may have been altered to accommodate the in- sert, and may be unsafe to use as a conventional ﬁreplace. (A Fireplace Modiﬁcation Tag is includ- ed in the hardware bag inside the WinterWarm Small Insert.)

Minimum Fireplace Dimensions

The WinterWarm Small Insert will ﬁt most masonry and factory-built ﬁreplaces. To conﬁrm that it will ﬁt yours, measure the lintel depth, plus the height, width, and depth of your ﬁreplace and hearth. Compare them to the measurements in the accompanying chart. If you choose to install a new hearth over an existing ﬁreplace hearth, be sure to take its thickness into consideration when measuring both front and back height of the ﬁreplace.

The unit can be installed virtually ﬂush with the ﬁreplace opening or it can extend up to 6³⁄₄” (172mm) onto the hearth. Figure 3 gives minimum and maximum dimen- sions for ﬁreplaces which will accommodate the Winter- Warm Small Insert.

NOTE: The clearance between the WinterWarm Small Insert and the mantel, top trim and side trim cannot be reduced by installing shields.

Another requirement to consider is the clearance for movable items such as tables, bookcases, rugs, furnish- ings, and your woodbox. All combustible materials of this type should be a minimum of 48” (1220 mm) from the front surface of the WinterWarm Small Insert. Be sure that family members are aware of this requirement as well, so they too will keep objects a safe distance

from the WinterWarm Small Insert.	5