| Size | Diameter A | Diameter B | Length C | HEIGHT |
| 5" | 5 1/4" | 9" | 11" | 11" |
| 6" | 6 1/4" | 9" | 12" | 11" |
| 7" | 7 1/4" | 11" | 13" | 11" |
| 8" | 8 1/4" | 11" | 14 1/4" | 11" |
| Ceiling Pitch | ||
| Single Wall | Double Wall | Use |
| 0/12-4/12 | 0/12-6/12 | 11" Support Box |
| 5/12-9/12 | 7/12-13/12 | 24" Support Box |
| 10/12-14/12 | 14/12-20/12 | 36" Support Box |