Superior 48-inch Section Hi-Temp Double Wall Pipe Snap Lock for 12-inch Chimney (48-12HT). Each double wall chimneypiece is made up of a 15-inch galvanized exterior pipe, a 12-3/8-inch stainless steel inner flue pipe, and a wire spacer. Actual lengths obtained after fitting overlaps must be considered (lineal gain). The actual measured length of a portion, once two or more parts are joined, is referred to as linear gain.
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