Chimney Cap Size Fits Outside Flue Width of Fits Outside Flue Length of Screen Mesh Height
5" x 9" 3 1/2" - 5 1/2" 7 1/2" - 9 1/2" 8"
9" x 9" 7 1/2" - 9 1/2" 7 1/2" - 9 1/2" 8"
9" x 13" 7 1/2" - 9 1/2" 11 1/2" - 13 1/2" 8"
9" x 18" 7 1/2" - 9 1/4" 16 1/2" - 18 1/4" 8"
11" x 11" 9 3/4" - 12" 9 3/4" - 12" 8"
12" x 16" 10" - 12 1/4" 14" - 16 1/4" 8"
13" x 13" 11 1/2" - 13 1/2" 11 1/2" - 13 1/2" 8"
13" x 18" 11 1/2" - 13 1/4" 16 1/2" - 18 1/4" 8"
15" x 15" 13 3/4" - 16" 13 3/4" - 16" 8"
18" x 18" 16 1/2" - 18" 16 1/2" - 18" 8"
20" x 20" 18 1/2" - 20 1/4" 18 1/2" - 20 1/4" 8"