Make a damper sealing block-off plate

A block-off plate is particularly helpful with inserts installed in fireplace on exterior walls with exterior chimneys. Without one, the flue liner (which should be insulated) and the stove will try to heat the mass of masonry that is exposed to the outdoors. This can result in a

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seeking info on Avalon AVB-800 (or AV5-800?) insert, from Oct 1985