Chimney Cap Size	Fits Outside Flue Width of	Fits Outside Flue Length of	Screen Mesh Height
8" x 8"	6" - 8 1/2"	6" - 8 1/2"	8"
8" x 13"	6" - 8 1/2"	11 1/2" - 14'	8"
8" x 17"	6 1/4" - 8 1/2"	16 1/2" - 19"	8"
13" x 13"	11" - 13 1/2"	11 1/2" - 14"	8"
13" x 17"	11" - 13 1/2"	16 1/2" - 19"	8"
17" x 17"	16" - 18 1/2"	16 1/2" - 19"	8"