Rigid Liner Storm Collar Size:5 in. Note: Do not use top Note: Do not use top mount dampers with gas logs It will also provide more length if you wish to pull your stove a little further out on the hearth Storm Collar Size Fits Pipe Outside Diameter Width of Storm Collar Band 3" 2 7 8" x 3 1 4" 3" 4" 3 7 8" x 4 3 8" 3" 5" 4 7 8" x 5 1 4" 3" 6" 5 1 2" x 6 1 4" 3" 7" 6 1 2" x 7 1 4" 3" 8" 7 1 2" x 8 1 4" 3" 9" 8 1 2" x 9 1 4" 3" 10" 9 1 2" x 10 1 4" 4" 11" 10 1 2" to 11 1 4" 4" 12" 11 1 4" to 12 1 4" 4" 13" 12 1 2" to 13 1 4" 4" 14" 13 1 2" to 14 1 4" 4" 15" 14 1 4" to 15 1 4" 4" 16" 15 1 4" to 16 1 4" 4" Install the stainless steel storm collar around the rigid liner right above the support clamp to keep moisture from entering the flue liner or the chimney cavity