Pre-punched flange, complete and ready to mount over roof opening. Can be installed on metal or sloped roofs. (Minimum 3:12 pitch).
- Call Size - | - - - A - - - | - - - B - - - | - - - C - - - | - - - D - - - | - Maximum Roof - Opening |
16 x 16 | 15 | 15 | 21-1/2 | 21-1/2 | 14-1/2 x 14-1/2 |
16 x 24 | 15 | 23 | 21-1/2 | 29-1/2 | 14-1/2 x 22-1/2 |
16 x 32 | 15 | 31 | 21-1/2 | 37-1/2 | 14-1/2 x 30-1/2 |
16 x 48 | 15 | 47 | 21-1/2 | 53-1/2 | 14-1/2 x 46-1/2 |
24 x 24 | 23 | 23 | 29-1/2 | 29-1/2 | 22-1/2 x 22-1/2 |
24 x 32 | 23 | 31 | 29-1/2 | 37-1/2 | 22-1/2 x 30-1/2 |
24 x 48 | 23 | 47 | 29-1/2 | 53-1/2 | 22-1/2 x 46-1/2 |
32 x 32 | 31 | 31 | 37-1/2 | 37-1/2 | 30-1/2 x 30-1/2 |
48 x 48 | 47 | 47 | 53-1/2 | 53-1/2 | 46-1/2 x 46-1/2 |