AMERIVENT DOUBLE WALL INCREASERS
| MODEL # | SIZE |
| 04X3EI | 3×4 |
| 05X3EI | 3×5 |
| 05X4EI | 4×5 |
| 06X3EI | 3×6 |
| 06X4EI | 4×6 |
| 06X5EI | 5×6 |
| 07X3EI | 3×7 |
| 07X4RI | 4×7 |
| 07X5EI | 5×7 |
| 07X6EI | 6×7 |
| 08X4RI | 4×8 |
| 08X5RI | 5×8 |
| 08X6RI | 6×8 |
| 08X7RI | 7×8 |
| 09X7RI | 7×9 |
| 09X8RI | 8×9 |
| 10X6RI | 6×10 |
| 10X7RI | 7×10 |
| 10X8RI | 8×10 |
| 10X9RI | 9×10 |
| 12X7RI | 7×12 |
| 12X8RI | 8×12 |
| 12X9RI | 9×12 |
| 12X10RI | 10×12 |
| 14x10RI | 10×14 |
| 14X12RI | 12×14 |
| 16X14RI | 14×16 |