| 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" |