Chimney Damper Flue Extension

Rockford Chimney Verified independent store

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You may need a Flue Extension to install your top mount chimney damper if there is no existing flue tile extending from the chimney top or the flue tile is too short. The extension pieces are 4 inches tall. Easily bolts to the flue extension with tapcon screws (purchased separately). Sizing Optional Adapter Size Actual Inside Dimensions 8" x 8" 7.92" x 7.92" 8" x 13" 7.92" x 12.92" 8" x 18" 7.92" x 17.92" 12" x 12" 11.92" x 11.92" 13" x 13" 12.92" x 12.92" 13" x 18" 12.92" x 17.92" 18" x 18" 17.92" x 17.92" Show more